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From: | Kévin Le Gouguec |
Subject: | bug#41194: 28.0.50; [feature/native-comp] fibn benchmark exhausts memory |
Date: | Sun, 14 Jun 2020 17:19:29 +0200 |
User-agent: | Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Andrea Corallo <akrl@sdf.org> writes: > 5a55a845a7 * Implement 'maybe_gc_or_quit' to allow correct GC in compiled Lisp > 34ed9d2498 * Introduce latches > > are fixing here this issue, now running fibn at speed 2 the memory > consuptions stays constant. Alright, feedback time! Commits: - master: 82a632edc8b80bf16d9b9f205474bf9724b084c0 - feature/native-comp: 5a55a845a7c426e82e8a6a6d02bc4a39992871e3 The Good News ============= - I can compile the branch without adding files to the default blacklist, - compilation (-j1) now only takes less than 6 hours instead of 3 days (compared with 1.5 hour on master), - at no point during compilation did the system swap; in fact, I could probably have risked a -j2 build, - elisp-benchmarks doesn't show any obvious performance regression (… though see Bad News). For details on memory usage during compilation, see attached memory profile (to compare with bug#41077#28).
compilation-memory.pdf
Description: Adobe PDF document
Few files take more than 3 minutes to compile now: ELC+ELN emacs-lisp/comp.el 0:09:49 ELC+ELN org/org.el 0:03:39 ELC+ELN ../lisp/window.el 0:03:16 ELC+ELN emacs-lisp/bytecomp.el 0:03:16 For details on performance, see attached tables for master and feature/native-comp, respectively (to compare with bug#41077#40).
perfs.org
Description: Text Data
The Bad News ============ - fibn still exhausts memory, - now pidigits does too.
fibn.pdf
Description: Adobe PDF document
pidigits.pdf
Description: Adobe PDF document
I've only tried the default comp-speed (2) so far. I've attached the results of M-x disassemble on the functions in fibn.el and pidigits.el.
elb-eliminate-digit.s
Description: Text Data
elb-extract-digit.s
Description: Text Data
elb-fibn.s
Description: Text Data
elb-fibn-entry.s
Description: Text Data
elb-next-term.s
Description: Text Data
elb-pidigits.s
Description: Text Data
elb-pidigits-entry.s
Description: Text Data
Let me know what I can do to help diagnose this further. Again, thank you for the time spent on this issue!
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