From 3b6a2c161825236f442727107b02d30a4b4c0c70 Mon Sep 17 00:00:00 2001 From: Sacha Chua Date: Thu, 2 Dec 2021 01:23:52 -0500 Subject: IRC notes from day 2 --- 2021/talks/faster.md | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) (limited to '2021/talks/faster.md') diff --git a/2021/talks/faster.md b/2021/talks/faster.md index 43d30743..28b89b5d 100644 --- a/2021/talks/faster.md +++ b/2021/talks/faster.md @@ -7,8 +7,6 @@ # Optimizing Emacs Lisp Code Dmitry Gutov - - [[!inline pages="internal(2021/info/faster-schedule)" raw="yes"]] [[!table header="no" class="speaker-details" data=""" @@ -28,6 +26,23 @@ Preferred contact info | the bottleneck is. How to quickly load a byte-compiled version. - Steps taken to speed up the Xref package recently. +# Discussion + +IRC nick: dgutov + +- If somebody wants to do a remote session with me: I do have processes such as updating column view dynamic blocks that take maybe 40 minutes. So far, I avoid executing those functions when I'm around the computer myself. However, there may be room for improvement and I really can't tell wether it is in my personal setup or not because it's not always that easy to re-create a use-case with plain Emacs cnofig +- Thanks for doing this talk. FYI you might find the this bench-multi-lexical macro useful: https://alphapapa.github.io/emacs-package-dev-handbook/#outline-container-Optimization + - dgutov: I can't seem to find the exact macro you are referring to. But if it covers a use case benchmark-progn does not, consider contributing it to benchmark.el in the core. + - Sorry, try this link directly to that macro: https://github.com/alphapapa/emacs-package-dev-handbook#bench-multi-lexical The purpose of the macro is to compare different forms and show how they perform relative to each other + - dgutov: Ah yeah, that looks pretty cool. Less sure about the org format, but it must be nice for presentations. + - The Org format is good for documentation too. But it just uses the output of benchmark-run, so it could easily be left in Lisp form. :) + - dgutov: These things are really handy to have available in 'emacs -Q', though. When you're working on shaving some extra handful of percents. + - Yes, a few lines of code could be added to run the compiled code in a separate Emacs process. +- https://github.com/alphapapa/emacs-package-dev-handbook compares some common ways to do common things in Elisp so you can see which is generally faster, e.g. https://github.com/alphapapa/emacs-package-dev-handbook#inserting-strings +- PSA: buffer-local-value is generally much faster than with-current-buffer if all you need to do is get the value of a variable in a buffer +- For more info about the performance of overlays vs text properties data structure, there's an Emacs TODO about it. C-h C-t and search for "Move overlays to intervals.c". +- cl-defstruct getters/setters have compiler macros that expand into simple aref calls on vectors, they are very efficient + [[!inline pages="internal(2021/captions/faster)" raw="yes"]] [[!inline pages="internal(2021/info/faster-nav)" raw="yes"]] -- cgit v1.2.3