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bug#24937: "deleting unused links" GC phase is too slow
From: |
Ricardo Wurmus |
Subject: |
bug#24937: "deleting unused links" GC phase is too slow |
Date: |
Tue, 13 Dec 2016 18:18:57 +0100 |
User-agent: |
mu4e 0.9.16; emacs 25.1.1 |
Ludovic Courtès <address@hidden> writes:
> Ricardo, Roel: would you be able to run that links-traversal.c from
> <https://debbugs.gnu.org/cgi/bugreport.cgi?filename=links-traversal.c;bug=24937;msg=25;att=1>
> on a machine with a big store, as described at
> <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=24937#25>?
I just ran this on my workstation in the office where I regularly build
packages. Here’s the output of “df -i /gnu”
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/mapper/fedora-root 3301376 1098852 2202524 34% /
Probably not large enough to derive conclusions about hydra’s behaviour.
[I can’t run it on the shared store at the MDC because NFS performance is
too poor. I recently ran “guix gc --optimize” to dedupe the shared
store (post-build deduplication is disabled since a few weeks) and it’s
at 3,197,489 used inodes.]
Here are the results of running the link-traversal code on my
workstation:
--8<---------------cut here---------------start------------->8---
rwurmus in ~: gcc -std=gnu99 -Wall links-traversal.c -DMODE=3
rwurmus in ~: sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
rwurmus in ~: time ./a.out
412825 dir_entries, 107 seconds
stat took 0 seconds
real 1m47.264s
user 0m0.214s
sys 0m1.314s
rwurmus in ~: gcc -std=gnu99 -Wall links-traversal.c -DMODE=2
rwurmus in ~: sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
rwurmus in ~: time ./a.out
12821 dir_entries, 107 seconds (including stat)
real 1m46.475s
user 0m0.201s
sys 0m1.309s
--8<---------------cut here---------------end--------------->8---
--
Ricardo
- bug#24937: "deleting unused links" GC phase is too slow, Ludovic Courtès, 2016/12/09
- bug#24937: "deleting unused links" GC phase is too slow, Ludovic Courtès, 2016/12/11
- bug#24937: "deleting unused links" GC phase is too slow, Mark H Weaver, 2016/12/11
- bug#24937: "deleting unused links" GC phase is too slow, Ludovic Courtès, 2016/12/11
- bug#24937: "deleting unused links" GC phase is too slow, Mark H Weaver, 2016/12/11
- bug#24937: "deleting unused links" GC phase is too slow, Ludovic Courtès, 2016/12/12
- bug#24937: "deleting unused links" GC phase is too slow, Mark H Weaver, 2016/12/13
- bug#24937: "deleting unused links" GC phase is too slow, Ludovic Courtès, 2016/12/13
- bug#24937: "deleting unused links" GC phase is too slow,
Ricardo Wurmus <=
- bug#24937: "deleting unused links" GC phase is too slow, Mark H Weaver, 2016/12/12
- bug#24937: "deleting unused links" GC phase is too slow, Mark H Weaver, 2016/12/14