|
|
<!-- Automatically generated by emacsconf-publish-after-page -->
<a name="gc-mainVideo-transcript"></a>
# Transcript
[[!template new="1" text="""Introduction""" start="00:00:00.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Hello everyone, my name is Ihor Radchenko,""" start="00:00:00.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and you may know me from Org Mailing List.""" start="00:00:04.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""However, today I'm not going to talk about Org Mode.""" start="00:00:07.600" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Today I'm going to talk about""" start="00:00:09.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Emacs performance and how it's affected""" start="00:00:11.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""by its memory management code.""" start="00:00:14.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""First, I will introduce the basic concepts""" start="00:00:19.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""of Emacs memory management and what garbage collection is.""" start="00:00:21.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Then I will show you user statistics""" start="00:00:26.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""collected from volunteer users over the last half year""" start="00:00:30.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and I will end with some guidelines""" start="00:00:34.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""on how to tweak Emacs garbage collection customizations""" start="00:00:39.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""to optimize Emacs performance""" start="00:00:44.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and when it's necessary or not to do.""" start="00:00:47.480" video="mainVideo-gc" id="subtitle"]]
[[!template new="1" text="""About garbage collection in Emacs""" start="00:00:51.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Let's begin. What is garbage collection?""" start="00:00:51.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""To understand what is garbage collection,""" start="00:00:54.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""we need to realize that anything you do in Emacs""" start="00:00:56.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""is some kind of command. Any command is most likely""" start="00:00:59.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""running some Elisp code. Every time you run Elisp code,""" start="00:01:02.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you most likely need to locate certain memory in RAM.""" start="00:01:05.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Some of this memory is retained for a long time""" start="00:01:09.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and some of this memory is transient.""" start="00:01:12.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Of course, Emacs has to clear this transient memory""" start="00:01:15.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""from time to time, to not occupy all the possible RAM""" start="00:01:19.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""in the computer. In this small example,""" start="00:01:21.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""we have one global variable""" start="00:01:21.448" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that is assigned a value,""" start="00:01:28.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but when assigning the value,""" start="00:01:31.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""we first allocate a temporary variable""" start="00:01:33.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and then a temporary list""" start="00:01:35.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and only retain some part of this list""" start="00:01:37.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""in this global variable.""" start="00:01:40.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""In terms of memory graph""" start="00:01:42.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""we can represent this as two variable slots,""" start="00:01:44.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""one transient, one permanent,""" start="00:01:50.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and then a list of three cons cells,""" start="00:01:53.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""part of which is retained as a global variable""" start="00:01:56.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but part of it which is a temporary variable symbol.""" start="00:02:01.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""The first term of the list is not used""" start="00:02:05.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and it might be cleared at some point.""" start="00:02:07.680" video="mainVideo-gc" id="subtitle"]]
[[!template new="1" text="""Garbage collection in Emacs""" start="00:02:09.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So that's what Emacs does.""" start="00:02:09.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Every now and then, Emacs goes through all the memory""" start="00:02:12.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and identifies which part of the memory are not used""" start="00:02:15.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and then clear them so that it can free up the RAM.""" start="00:02:19.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""This process is called garbage collection""" start="00:02:23.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and Emacs uses a very simple and old algorithm""" start="00:02:25.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which is called Mark & Sweep.""" start="00:02:28.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So doing this mark and sweep process""" start="00:02:30.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""is basically two stages.""" start="00:02:33.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""First, Emacs scans all the memory that is allocated""" start="00:02:34.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and then identifies which memory is still in use""" start="00:02:40.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which is linked to some variables, for example,""" start="00:02:42.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and which memory is not used anymore""" start="00:02:45.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""even though it was allocated in the past.""" start="00:02:47.600" video="mainVideo-gc" id="subtitle"]]
[[!template text="""The second stage [??] whenever a memory is not,""" start="00:02:49.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that is not allocated. During the process""" start="00:02:53.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Emacs cannot do anything now.""" start="00:02:59.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So basically, every time Emacs scans the memory,""" start="00:03:00.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it freezes up and doesn't respond to anything,""" start="00:03:04.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and if it takes too much time so that users can notice it,""" start="00:03:07.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""then of course Emacs is not responsive at all,""" start="00:03:10.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and if this garbage collection is triggered too frequently,""" start="00:03:13.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""then it's not just not responsive every now and then.""" start="00:03:19.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""It's also not responsive all the time,""" start="00:03:22.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""almost all the time,""" start="00:03:24.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so it cannot even normally type or stuff""" start="00:03:26.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""or do some normal commands.""" start="00:03:27.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""This mark and sweep algorithm is taking longer""" start="00:03:32.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""the more memory Emacs uses. So basically,""" start="00:03:36.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""the more buffers you open, the more packages you load,""" start="00:03:40.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""the more complex commands you run, the more memory is used,""" start="00:03:44.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and basically, the longer Emacs takes""" start="00:03:48.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""to perform a single garbage collection.""" start="00:03:52.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Of course, Emacs being Emacs""" start="00:03:57.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""this garbage collection can be tweaked.""" start="00:04:02.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""In particular users can tweak""" start="00:04:06.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""how frequently Emacs does garbage collection""" start="00:04:08.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""using two basic variables: `gc-cons-threshold`""" start="00:04:10.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and `gc-cons-percentage`.""" start="00:04:13.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""`gc-cons-threshold` is the raw number of kilobytes""" start="00:04:15.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Emacs needs to allocate""" start="00:04:21.600" video="mainVideo-gc" id="subtitle"]]
[[!template text="""before triggering another garbage collection,""" start="00:04:22.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and the `gc-cons-percentage` is similar,""" start="00:04:25.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but it's defined in terms of fraction""" start="00:04:27.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""of already-allocated memory.""" start="00:04:30.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""If you follow various Emacs forums,""" start="00:04:34.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you may be familiar with people complaining about""" start="00:04:38.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""garbage collection. There are many many suggestions""" start="00:04:41.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""about what to do with it.""" start="00:04:46.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Most frequently, you see `gc-cons-threshold`""" start="00:04:48.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""recommended to be increased,""" start="00:04:54.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and a number of pre-packaged Emacs distributions""" start="00:04:56.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like Doom Emacs do increase it.""" start="00:05:01.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""I have seen suggestions which are actually horrible""" start="00:05:04.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""to disable garbage collection temporarily""" start="00:05:07.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""or for a long time.""" start="00:05:10.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Which is nice... You can see it quite frequently,""" start="00:05:14.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which indicates there might be some problem.""" start="00:05:17.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""However, every time one user poses about this problem,""" start="00:05:19.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it's just one data point and it doesn't mean""" start="00:05:23.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that everyone actually suffers from it.""" start="00:05:26.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""It doesn't mean that everyone should do it.""" start="00:05:28.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So in order to understand if this garbage collection""" start="00:05:33.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""is really a problem which is a common problem""" start="00:05:35.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""we do need some kind of statistics""" start="00:05:39.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and only using the actual statistics""" start="00:05:44.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""we can understand if it should be recommended for everyone""" start="00:05:46.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""to tweak the defaults or like whether""" start="00:05:52.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it should be recommended for certain users""" start="00:05:55.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""or maybe it should be asked Emacs devs""" start="00:05:57.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""to do something about the defaults.""" start="00:05:59.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""And what I did some time ago is exactly this.""" start="00:06:01.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""I tried to collect the user statistics.""" start="00:06:07.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So I wrote a small package on Elp""" start="00:06:09.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and some users installed this package""" start="00:06:14.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and then reported back these statistics""" start="00:06:18.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""of the garbage collection for their particular use.""" start="00:06:22.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""By now we have obtained 129 user submissions""" start="00:06:24.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""with over 1 million GC records in there.""" start="00:06:30.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So like some of these submissions""" start="00:06:34.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""used default GC settings without any customizations.""" start="00:06:38.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Some used increased GC cost threshold""" start="00:06:43.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and GC cost percentage.""" start="00:06:46.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So using this data we can try to draw""" start="00:06:47.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""some reliable conclusions on what should be done""" start="00:06:53.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and whether should anything be done about garbage collection""" start="00:06:56.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""on Emacs dev level or at least on user level.""" start="00:06:59.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Of course we need to keep in mind""" start="00:07:02.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that there's some kind of bias""" start="00:07:05.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""because it's more likely""" start="00:07:07.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that users already have problems with GC""" start="00:07:09.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""or they think they have problems with GC""" start="00:07:11.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""will report and submit the data.""" start="00:07:13.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""But anyway having s statistics is much more useful""" start="00:07:15.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""than just having anecdotal evidences""" start="00:07:20.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""from one or other reddit posts.""" start="00:07:22.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""And just one thing I will do""" start="00:07:25.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""during the rest of my presentation""" start="00:07:28.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""is that for all the statistics""" start="00:07:30.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""I will normalize user data""" start="00:07:32.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so that every user contributes equally.""" start="00:07:35.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""For example if one user submits like""" start="00:07:37.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""100 hours Emacs uptime statistics""" start="00:07:40.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and other users submit one hour Emacs uptime""" start="00:07:43.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""then I will anyway make it so that they contribute equally.""" start="00:07:46.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Let's start from one of the most obvious things""" start="00:07:52.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""we can look into is""" start="00:07:56.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which is the time it takes for garbage collection""" start="00:07:57.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""to single garbage collection process.""" start="00:08:00.600" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Here you see frequency distribution of GC duration""" start="00:08:05.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""for all the 129 users we got""" start="00:08:11.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and you can see that most of the garbage collections""" start="00:08:15.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""are done quite quickly in less than 0.1 second""" start="00:08:22.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and less than 0.1 second is usually just not noticeable.""" start="00:08:27.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So even though there is garbage collection""" start="00:08:32.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it will not interrupt the work in Emacs.""" start="00:08:34.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""However there is a fraction of users""" start="00:08:39.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""who experience garbage collection""" start="00:08:43.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it takes like 0.2, 0.3 or even half a second""" start="00:08:45.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which will be quite noticeable.""" start="00:08:48.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""For the purposes of this study""" start="00:08:50.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""I will consider that anything that is less than 0.1 second""" start="00:08:55.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which is insignificant so like you will not notice it""" start="00:08:59.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and it's like obviously""" start="00:09:02.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""all the Emacs usage will be just normal.""" start="00:09:04.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""But if it's more than 0.1 or 0.2 seconds""" start="00:09:07.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""then it will be very noticeable""" start="00:09:11.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and you will see that Emacs hang for a little while""" start="00:09:13.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""or not so little while. In terms of numbers""" start="00:09:16.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it's better to plot the statistics not as a distribution""" start="00:09:21.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but as a cumulative distribution.""" start="00:09:26.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So like at every point of this graph""" start="00:09:28.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you'll see like for example here 0.4 seconds""" start="00:09:31.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you have this percent of like almost 90% of users""" start="00:09:37.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""have no more than 0.4 gc duration.""" start="00:09:42.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So like we can look here if we take one""" start="00:09:49.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""gc critical gc duration which is 0.1 second""" start="00:09:53.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""0.1 second and look at how many users have""" start="00:09:56.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it so we have 56% which is like""" start="00:10:00.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""44% users have less than 0.1 second gc duration""" start="00:10:02.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and the rest 56% have more than 0.1 second.""" start="00:10:09.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So you can see like more than half of users""" start="00:10:12.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""actually have noticeable gc delay""" start="00:10:16.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so the Emacs freezes for some noticeable time""" start="00:10:20.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and a quarter of users actually have very noticeable""" start="00:10:23.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so like Emacs freezes such that you see an actual delay""" start="00:10:27.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that Emacs actually has""" start="00:10:31.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which is quite significant and important point.""" start="00:10:36.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""But apart from the duration of each individual gc""" start="00:10:44.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it is important to see how frequent it is""" start="00:10:47.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""because even if you do notice a delay""" start="00:10:49.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""even a few seconds delay""" start="00:10:52.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it doesn't matter if it happens once""" start="00:10:54.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""during the whole Emacs session.""" start="00:10:57.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So if you look into frequency distribution again here""" start="00:10:59.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""I plot time between subsequent garbage collections""" start="00:11:05.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""versus how frequent it is and we have very clear trend""" start="00:11:13.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that most of the garbage collections are quite frequent""" start="00:11:17.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like we talk about every few seconds a few tens of seconds.""" start="00:11:21.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""There's a few outliers which are at very round numbers""" start="00:11:25.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like 60 seconds, 120 seconds, 300 seconds.""" start="00:11:30.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""These are usually timers so like""" start="00:11:35.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you have something running on timer""" start="00:11:37.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and then it is complex command""" start="00:11:40.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and it triggers garbage collection""" start="00:11:43.600" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but it's not the majority.""" start="00:11:45.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Again to run the numbers""" start="00:11:48.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it's better to look into cumulative distribution""" start="00:11:51.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and see that 50% of garbage collections""" start="00:11:53.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""are basically less than 10 seconds apart.""" start="00:11:56.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""And we can combine it with previous data""" start="00:11:58.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and we look into whatever garbage collection""" start="00:12:02.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""takes less than 10 seconds from each other""" start="00:12:07.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and also takes more than say 0.1 seconds.""" start="00:12:09.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So and then we see that""" start="00:12:13.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""one quarter of all garbage collections""" start="00:12:15.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""are just noticeable and also frequent""" start="00:12:17.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and 9% are not like""" start="00:12:21.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""more than 0.2% very noticeable and also frequent.""" start="00:12:23.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So basically it constitutes Emacs freezing.""" start="00:12:27.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So 9% of all the garbage collection Emacs freezing.""" start="00:12:30.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Of course if you remember there is a bias""" start="00:12:33.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but 9% is quite significant number.""" start="00:12:37.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So garbage collection can really slow down things""" start="00:12:40.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""not for everyone but for significant fraction of users.""" start="00:12:44.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Another thing I'd like to look into""" start="00:12:48.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""is what I call agglomerated GCs.""" start="00:12:52.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""What I mean by agglomerated is""" start="00:12:55.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""when you have one garbage collection""" start="00:12:57.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and then another garbage immediately after it.""" start="00:13:00.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So in terms of numbers I took""" start="00:13:03.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""every subsequent garbage collection""" start="00:13:05.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which is either immediately after""" start="00:13:08.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""or no more than one second after each.""" start="00:13:10.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So from point of view of users is like""" start="00:13:13.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""multiple garbage collection they add up together""" start="00:13:16.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""into one giant garbage collection.""" start="00:13:20.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""And if you look into numbers""" start="00:13:23.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""of how many agglomerated garbage collections there are""" start="00:13:25.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you can see even numbers over 100.""" start="00:13:29.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So 100 garbage collection going one after another.""" start="00:13:32.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Even if you think about each garbage collection""" start="00:13:35.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""taking 0.1 second we look into 100 of them""" start="00:13:39.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it's total 10 seconds.""" start="00:13:42.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""It's like Emacs hanging forever""" start="00:13:44.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""or like a significant number is also 10.""" start="00:13:46.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So again this would be very annoying to meet such thing.""" start="00:13:53.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""How frequently does it happen?""" start="00:13:56.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Again we can plot cumulative distribution""" start="00:13:57.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and we see that 20 percent like 19 percent""" start="00:14:00.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""of all the garbage collection are at least two together""" start="00:14:03.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and 8 percent like more than 10. So like you think about oh""" start="00:14:07.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""each garbage collection is not taking much time""" start="00:14:13.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but when you have 10 of them yeah that becomes a problem.""" start="00:14:15.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Another thing is to answer a question""" start="00:14:24.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that some people complain about is that""" start="00:14:29.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""longer you use Emacs the slower Emacs become.""" start="00:14:32.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Of course it may be caused by garbage collection""" start="00:14:35.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and I wanted to look into how garbage collection time""" start="00:14:43.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and other statistics,""" start="00:14:48.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""other parameters are evolving over time.""" start="00:14:49.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""And what I can see here is a cumulative distribution""" start="00:14:53.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""of GC duration for like first 10 minutes of Emacs uptime""" start="00:14:58.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""first 100 minutes first 1000 minutes.""" start="00:15:03.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""And if you look closer then you see""" start="00:15:06.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that each individual garbage collection on average""" start="00:15:10.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""takes longer as you use Emacs longer.""" start="00:15:14.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""However this longer is not much it's like maybe 10 percent""" start="00:15:18.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like basically garbage collection gets like""" start="00:15:24.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""slow Emacs down more as you use Emacs more but not much.""" start="00:15:29.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So basically if you do you see Emacs""" start="00:15:34.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""being slower and slower over time""" start="00:15:38.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it's probably not really garbage collection""" start="00:15:40.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""because it doesn't change too much.""" start="00:15:43.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""And if you look into time""" start="00:15:45.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""between individual garbage collections""" start="00:15:48.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and you see that the time actually increases""" start="00:15:50.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""as you use Emacs longer which makes sense""" start="00:15:53.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""because initially like first few minutes""" start="00:15:56.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you have all kind of packages loading""" start="00:15:58.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like all the port loading and then later""" start="00:16:01.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""everything is loaded and things become more stable.""" start="00:16:04.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So the conclusion on this part is that""" start="00:16:07.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""if Emacs becomes slower in a long session""" start="00:16:12.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it's probably not caused by garbage collection.""" start="00:16:16.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""And one word of warning of course is that""" start="00:16:18.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it's all nice and all when I present the statistics""" start="00:16:23.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but it's only an average""" start="00:16:27.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and if you are an actual user like here is one example""" start="00:16:29.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which shows a total garbage collection time""" start="00:16:34.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like accumulated together over Emacs uptime""" start="00:16:37.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and you see different lines""" start="00:16:40.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which correspond to different sessions of one user""" start="00:16:43.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and you see they are wildly different""" start="00:16:45.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like one time there is almost no garbage collection""" start="00:16:48.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""another time you see garbage collection""" start="00:16:51.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""because probably Emacs is used more early""" start="00:16:54.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""or like different pattern of usage""" start="00:16:57.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and even during a single Emacs session""" start="00:16:59.600" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you see a different slope""" start="00:17:03.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""of this curve which means that""" start="00:17:04.600" video="mainVideo-gc" id="subtitle"]]
[[!template text="""sometimes garbage collection is infrequent""" start="00:17:06.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and sometimes it's much more frequent""" start="00:17:09.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so it's probably much more noticeable one time""" start="00:17:11.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and less noticeable other time.""" start="00:17:14.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""So if you think about these statistics of course""" start="00:17:15.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""they only represent an average usage""" start="00:17:19.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but sometimes it can get worse sometimes it can get better.""" start="00:17:23.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""The last parameter I'd like to talk about is""" start="00:17:26.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""garbage collection during Emacs init.""" start="00:17:33.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Basically if you think about what happens during Emacs init""" start="00:17:35.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like when Emacs just starting up""" start="00:17:40.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""then whatever garbage collection""" start="00:17:41.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""there it's one or it's several times""" start="00:17:44.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it all contributes to Emacs taking longer to start.""" start="00:17:46.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""And again we can look into the statistic""" start="00:17:51.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and see what is the total GC duration after Emacs init""" start="00:17:56.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and we see that 50% of all the submissions""" start="00:18:01.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""garbage collection adds up more than one second""" start="00:18:06.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""to Emacs init time and for 20% of users""" start="00:18:10.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it's extra three seconds Emacs start time""" start="00:18:14.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which is very significant""" start="00:18:17.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""especially for people who are used to Vim""" start="00:18:18.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which can start in like a fraction of a second""" start="00:18:21.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and here it just does garbage collection""" start="00:18:23.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""because garbage collection is not""" start="00:18:26.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""everything Emacs does during startup""" start="00:18:27.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""adds up more to the load.""" start="00:18:29.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Okay that's all nice and all""" start="00:18:32.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but what can we do about these statistics""" start="00:18:36.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""can we draw any conclusions""" start="00:18:38.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and the answer is of course""" start="00:18:40.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like the most important conclusion here is that""" start="00:18:43.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""yes garbage collection can slow down Emacs""" start="00:18:46.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""at least for some people and what to do about it""" start="00:18:49.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""there are two variables which you can tweak""" start="00:18:52.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it's because gcconce threshold gcconce percentage""" start="00:18:55.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and having the statistics I can at least look a little bit""" start="00:18:58.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""into what is the effect of increasing these variables""" start="00:19:03.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like most people just increase gcconce threshold""" start="00:19:08.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and like all the submissions people did increase""" start="00:19:12.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and doesn't make much sense to decrease it""" start="00:19:16.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like to make things worse""" start="00:19:19.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""of course for these statistics""" start="00:19:21.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""the exact values of this increased thresholds""" start="00:19:27.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""are not always the same""" start="00:19:31.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but at least we can look into some trends""" start="00:19:33.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so first and obvious thing we can observe""" start="00:19:36.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""is when we compare""" start="00:19:44.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""the standard gc settings standard thresholds""" start="00:19:46.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and increased thresholds for time between""" start="00:19:50.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""subsequent gcs and as one may expect""" start="00:19:54.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""if you increase the threshold""" start="00:19:57.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Emacs will do garbage collection less frequently""" start="00:19:59.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so the spacing between garbage collection increases""" start="00:20:02.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""okay the only thing is that""" start="00:20:05.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""if garbage collection is less frequent""" start="00:20:07.600" video="mainVideo-gc" id="subtitle"]]
[[!template text="""then each individual garbage collection becomes longer""" start="00:20:10.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so if you think about increasing""" start="00:20:14.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""garbage collection thresholds be prepared""" start="00:20:18.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that in each individual time Emacs freezes will take longer""" start="00:20:22.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""this is one caveat when we talk about""" start="00:20:26.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""this agglomerated gcs which are one after other""" start="00:20:31.600" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like if you increase the threshold sufficiently""" start="00:20:34.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""then whatever happened that garbage collections""" start="00:20:36.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""were like done one after other""" start="00:20:42.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""we can now make it so that they are actually separated""" start="00:20:44.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so like you don't see one giant freeze caused by""" start="00:20:47.600" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like 10 gcs in a row""" start="00:20:51.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""instead you can make it so that they are separated""" start="00:20:52.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and in statistics it's very clear""" start="00:20:55.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that the number of agglomerated garbage collections""" start="00:20:59.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""decreases dramatically when you increase the thresholds""" start="00:21:02.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it's particularly evident when we look into startup time""" start="00:21:06.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""if you look at gc duration during Emacs startup""" start="00:21:11.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and if we look into what happens""" start="00:21:17.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""when you increase the thresholds""" start="00:21:19.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it's very clear that Emacs startup become faster""" start="00:21:20.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""when you increase gc thresholds""" start="00:21:23.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so that's all for actual user statistics""" start="00:21:26.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and now let's try to run into""" start="00:21:33.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""some like actual recommendations""" start="00:21:35.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""on what numbers to set and before we start""" start="00:21:38.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""let me explain a little bit about""" start="00:21:42.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""the difference between these two variables""" start="00:21:44.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which is gc constant threshold and gc constant percentage""" start="00:21:46.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so if you think about Emacs memory""" start="00:21:48.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like there's a certain memory allocated by Emacs""" start="00:21:52.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and then as you run commands and turn using Emacs""" start="00:21:55.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""there is more memory allocated""" start="00:21:58.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and Emacs decides when to do garbage collection""" start="00:22:00.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""according these two variables""" start="00:22:04.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and actually what it does it chooses the larger one""" start="00:22:06.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so say you have you are late in Emacs session""" start="00:22:08.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you have a lot of Emacs memory allocated""" start="00:22:12.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""then you have gc constant percentage""" start="00:22:14.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which is percent of the already allocated memory""" start="00:22:17.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and that percent is probably going to be the largest""" start="00:22:19.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""because you have more memory""" start="00:22:25.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and memory means that percent of it is larger""" start="00:22:28.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so like you have a larger number cost""" start="00:22:32.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""by gc constant percentage""" start="00:22:36.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so in this scenario when Emacs session is already running""" start="00:22:37.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""for a long time and there is a lot of memory allocated""" start="00:22:43.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you have gc constant percentage""" start="00:22:45.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""controlling the garbage collection""" start="00:22:50.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""while early in Emacs there is not much memory placed""" start="00:22:52.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""Emacs just starting up then gc constant threshold""" start="00:22:55.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""is controlling how frequently garbage collection happens""" start="00:22:58.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""because smaller allocated memory""" start="00:23:01.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""means its percentage will be a small number""" start="00:23:04.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so in terms of default values at least""" start="00:23:06.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""gc constant threshold is 800 kilobytes""" start="00:23:12.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and gc constant percentage is 10""" start="00:23:14.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so gc constant percentage becomes larger than that threshold""" start="00:23:18.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""when you have more than eight megabytes of allocated memory""" start="00:23:24.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""by Emacs which is quite early""" start="00:23:28.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and it will probably hold just during the startup""" start="00:23:31.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and once you start using your maximum""" start="00:23:34.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and once you load all the histories""" start="00:23:36.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""all the kinds of buffers it's probably going to take""" start="00:23:38.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""more than much more than eight megabytes""" start="00:23:42.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so now we understand this""" start="00:23:43.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""we can draw certain recommendations""" start="00:23:50.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""about tweaking the gc thresholds""" start="00:23:53.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so first of all I need to emphasize""" start="00:23:57.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that any time you increase gc threshold""" start="00:24:01.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""an individual garbage collection time increases""" start="00:24:03.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so it's not free at all""" start="00:24:07.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""if you don't have problems with garbage collection""" start="00:24:08.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which is half of the users don't have much problem""" start="00:24:11.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you don't need to tweak anything""" start="00:24:13.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""only when gc is frequent and slow""" start="00:24:15.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""when Emacs is really really present frequently""" start="00:24:19.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you may consider increasing gc thresholds only""" start="00:24:23.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and in particular I recommend""" start="00:24:27.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""increasing gc constant percentage""" start="00:24:31.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""because that's what mostly controls gc""" start="00:24:33.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""when Emacs is running for long session""" start="00:24:36.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and the numbers are probably like""" start="00:24:40.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""yeah we can estimate the effect of these numbers""" start="00:24:43.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like for example if you have a default value of 0.1 percent""" start="00:24:46.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""for gc constant percentage 0.1 which is 10 percent""" start="00:24:49.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and then increase it twice""" start="00:24:52.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""obviously you get twice less frequent gcs""" start="00:24:55.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but it will come at the cost of extra 10 percent gc time""" start="00:24:58.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and if you increase 10 times you can think about""" start="00:25:02.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""10 less 10 x less frequent gcs""" start="00:25:05.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but almost twice longer individual garbage collection time""" start="00:25:08.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so probably you want to set the number closer to 0.1""" start="00:25:12.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""another part of the users may actually""" start="00:25:16.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""try to optimize Emacs startup time""" start="00:25:23.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which is quite frequent problem""" start="00:25:28.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""in this case it's probably better to increase gc constant""" start="00:25:30.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but not too much so like""" start="00:25:34.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""first of all it makes sense to check""" start="00:25:38.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""whether garbage collection is a problem at all""" start="00:25:40.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""during startup and there are two variables""" start="00:25:43.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which can show what is happening this garbage collection""" start="00:25:46.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so gc done is a variable that shows""" start="00:25:50.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""how many garbage collection""" start="00:25:53.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like what is the number of garbage collections triggered""" start="00:25:55.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like when you check the value""" start="00:26:00.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""or right after you start Emacs""" start="00:26:02.600" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you will see that""" start="00:26:04.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""number and gc elapsed variable""" start="00:26:04.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which gives you a number of seconds""" start="00:26:08.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which Emacs spent in doing garbage collection""" start="00:26:11.600" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so this is probably the most important variable""" start="00:26:14.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and if you see it's large then you may consider tweaking it""" start="00:26:16.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""for the Emacs startup we can estimate some bounds""" start="00:26:20.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""because in the statistics I never saw anything""" start="00:26:26.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that is more than 10 seconds extra""" start="00:26:30.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""which even 10 seconds is probably like""" start="00:26:32.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""a really really hard upper bound so""" start="00:26:34.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""or say if you want to decrease the gc contribution""" start="00:26:39.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like order of magnitude or like two orders of magnitudes""" start="00:26:44.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""let's say like as a really hard top estimate""" start="00:26:47.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""then it corresponds to 80 megabytes gc constant""" start="00:26:50.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and probably much less so like""" start="00:26:55.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""there's no point setting it""" start="00:26:58.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""to a few hundred megabytes of course""" start="00:27:00.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""there's one caveat which is important to keep in""" start="00:27:04.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""mind though that increasing the gc thresholds""" start="00:27:08.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""is not just increasing individual gc time""" start="00:27:14.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""there's also an actual real impact on the RAM usage""" start="00:27:16.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so like if you increase gc threshold""" start="00:27:20.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it increases the RAM usage of Emacs""" start="00:27:23.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and you shouldn't think that like okay""" start="00:27:26.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""I increased the threshold by like 100 megabytes""" start="00:27:29.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""then 100 megabytes extra RAM usage doesn't matter""" start="00:27:33.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it's not 100 megabytes""" start="00:27:37.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""because less frequent garbage collection means""" start="00:27:38.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it will lead to memory fragmentation""" start="00:27:42.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so in practice if you increase the thresholds""" start="00:27:45.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""to tens or hundreds of megabytes""" start="00:27:50.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""we are talking about gigabytes extra RAM usage""" start="00:27:52.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""for me personally when I tried to play with gc thresholds""" start="00:27:55.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""I have seen Emacs taking two gigabytes like""" start="00:27:59.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""compared to several times less""" start="00:28:02.880" video="mainVideo-gc" id="subtitle"]]
[[!template text="""when with default settings so it's not free at all""" start="00:28:05.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and only like either when you have a lot of free RAM""" start="00:28:09.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and you don't care or when your Emacs is really slow""" start="00:28:13.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""then you may need to consider this""" start="00:28:16.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""tweaking these defaults so again don't tweak defaults""" start="00:28:19.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""if you don't really have a problem""" start="00:28:23.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and of course this RAM problem is a big big deal""" start="00:28:24.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""for Emacs devs because from from the point of single user""" start="00:28:29.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you have like normal laptop most likely like normal PC""" start="00:28:35.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""with a lot of RAM you don't care about these things too much""" start="00:28:38.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but Emacs in general can run on like all kinds of machines""" start="00:28:42.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""including low-end machines with very limited RAM""" start="00:28:49.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and anytime Emacs developers consider increasing""" start="00:28:51.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""the defaults for garbage collection""" start="00:28:55.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it's like they always have to consider""" start="00:28:57.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""if you increase them too much""" start="00:29:01.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""then Emacs may just stop running on certain platforms""" start="00:29:02.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so that's a very big consideration in terms""" start="00:29:07.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""of the global defaults for everyone""" start="00:29:14.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""although I have to I would say that it might be related""" start="00:29:16.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""to the safe to increase GCCons threshold""" start="00:29:22.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""because it mostly affects startup and during startup""" start="00:29:24.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it's probably not the peak usage of Emacs""" start="00:29:27.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and like as Emacs runs for longer""" start="00:29:31.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it's probably where most of RAM will be used later""" start="00:29:35.600" video="mainVideo-gc" id="subtitle"]]
[[!template text="""on the other hand GCCons percentage is much more debating""" start="00:29:38.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""because it has pros and cons""" start="00:29:44.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it will increase the RAM usage""" start="00:29:46.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it will increase the individual GC time so""" start="00:29:47.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""if we consider changing it it's much more tricky""" start="00:29:51.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and we have discussing probably measure the impact on users""" start="00:29:56.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and a final note on or from the point of view""" start="00:29:59.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""of Emacs development is""" start="00:30:05.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that this simple mark-and-sweep algorithm""" start="00:30:07.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""is like a very old and not the state-of-the-art algorithm""" start="00:30:11.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""there are variants of garbage collection""" start="00:30:14.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that are like totally non-blocking""" start="00:30:17.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so Emacs just doesn't have to freeze""" start="00:30:19.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""during the garbage collection""" start="00:30:22.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""or there are variants of garbage collection algorithm""" start="00:30:24.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that do not scan all the memory just fraction of it""" start="00:30:26.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and scan another fraction less frequently""" start="00:30:30.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so there are actually ways just to change""" start="00:30:33.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""the garbage collection algorithm to make things much faster""" start="00:30:37.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""of course like just changing the numbers of variables""" start="00:30:39.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like the numbers of variable values""" start="00:30:44.200" video="mainVideo-gc" id="subtitle"]]
[[!template text="""is much more tricky and one has to implement it""" start="00:30:47.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""obviously it would be nice if someone implements it""" start="00:30:50.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but so far it's not happening so yeah it would be nice""" start="00:30:52.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but maybe not not so quickly""" start="00:30:55.640" video="mainVideo-gc" id="subtitle"]]
[[!template text="""there is more chance to change the defaults here""" start="00:30:59.360" video="mainVideo-gc" id="subtitle"]]
[[!template text="""to conclude let me reiterate the most important points""" start="00:31:02.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so from point of view of users you need to understand that""" start="00:31:07.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""yes garbage collection may be a problem""" start="00:31:11.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but not for everyone so like""" start="00:31:14.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you should only think about changing the variables""" start="00:31:16.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""when you really know that garbage collection""" start="00:31:21.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""is the problem for you so if you have slow Emacs startup""" start="00:31:23.560" video="mainVideo-gc" id="subtitle"]]
[[!template text="""slow Emacs startup and you know that it's caused by""" start="00:31:27.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""garbage collection like by""" start="00:31:30.920" video="mainVideo-gc" id="subtitle"]]
[[!template text="""you can check the GC elapsed variable""" start="00:31:32.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""then you may increase GC count threshold""" start="00:31:36.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""like to few tens of megabytes not more""" start="00:31:39.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""it doesn't make sense to increase it much more""" start="00:31:42.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and if you really have major problems""" start="00:31:44.480" video="mainVideo-gc" id="subtitle"]]
[[!template text="""with Emacs being slaggy""" start="00:31:48.240" video="mainVideo-gc" id="subtitle"]]
[[!template text="""then you can increase GC count percentage""" start="00:31:49.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""to like 0.2 0.3 maybe""" start="00:31:52.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""one is probably overkill""" start="00:31:56.000" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but do watch your Emacs ROM usage it may be really impacted""" start="00:31:57.680" video="mainVideo-gc" id="subtitle"]]
[[!template text="""for Emacs developers I'd like to emphasize""" start="00:32:02.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""that there is a real problem with garbage collection""" start="00:32:09.720" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and nine percent of all the garbage collection""" start="00:32:12.440" video="mainVideo-gc" id="subtitle"]]
[[!template text="""data points we have correspond""" start="00:32:17.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""to really slow noticeable Emacs precision""" start="00:32:22.080" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and really frequent less than 10 seconds""" start="00:32:24.960" video="mainVideo-gc" id="subtitle"]]
[[!template text="""I'd say that it's really worth""" start="00:32:28.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""increasing GC count threshold at least during startup""" start="00:32:32.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""because it really impacts the Emacs startup time""" start="00:32:35.280" video="mainVideo-gc" id="subtitle"]]
[[!template text="""making Emacs startup much faster""" start="00:32:40.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""ideally we need to reimplement""" start="00:32:41.520" video="mainVideo-gc" id="subtitle"]]
[[!template text="""the garbage collection algorithm of course it's not easy""" start="00:32:44.800" video="mainVideo-gc" id="subtitle"]]
[[!template text="""but it would be really nice""" start="00:32:48.600" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and for GC count percentage defaults it's hard to say""" start="00:32:50.160" video="mainVideo-gc" id="subtitle"]]
[[!template text="""we may consider changing it but it's up to discussion""" start="00:32:56.400" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and we probably need to be conservative here""" start="00:33:00.760" video="mainVideo-gc" id="subtitle"]]
[[!template text="""so we came to the end of my talk""" start="00:33:03.120" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and this presentation""" start="00:33:06.040" video="mainVideo-gc" id="subtitle"]]
[[!template text="""all the data will be available publicly""" start="00:33:09.320" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and you can reproduce all the statistic graphs if you wish""" start="00:33:11.840" video="mainVideo-gc" id="subtitle"]]
[[!template text="""and thank you for attention""" start="00:33:17.080" video="mainVideo-gc" id="subtitle"]]
Questions or comments? Please e-mail [yantar92@posteo.net](mailto:yantar92@posteo.net?subject=Comment%20for%20EmacsConf%202023%20gc%3A%20emacs-gc-stats%3A%20Does%20garbage%20collection%20actually%20slow%20down%20Emacs%3F)
<!-- End of emacsconf-publish-after-page -->
|
