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bug#49439: grafts cause “guix environment” to get killed with OOM
From: |
Sarah Morgensen |
Subject: |
bug#49439: grafts cause “guix environment” to get killed with OOM |
Date: |
Tue, 27 Jul 2021 16:35:06 -0700 |
Hi,
Ludovic Courtès <ludo@gnu.org> writes:
[...]
>> I can reproduce this with pigx-scrnaseq as well a number of other
>> packages (listed below).
>>
>> $ ./pre-inst-env guix describe -f channels
>> (list (channel
>> (name 'guix)
>> (url "/home/sarah/guix")
>> (commit
>> "3217a04b0352c2dd13323257b369604eeabfccc3")))
>>
>> Does not complete within 5 minutes:
Okay, so all of a sudden I can't reproduce this; even with the same
commit as above, it completes in ~20s.
guix time-machine --commit=3217a04 -- environment pigx-scrnaseq
--search-paths >/dev/null
> What hardware are you using?
Virtualbox VM with VT-x etc. on a host i7-6700. The VM has 6GB of memory.
>
> Here’s what I observe (with everything already in store and on a hot
> cache, with an i7 CPU):
>
> $ guix describe
> Generacio 188 Jul 25 2021 12:47:29 (nuna)
> guix a92dfbc
> repository URL: https://git.savannah.gnu.org/git/guix.git
> branch: master
> commit: a92dfbce30777de6ca05031e275410cf9f56c84c
> $ time GUIX_PROFILING=gc guix environment pigx-scrnaseq --search-paths
> --no-grafts >/dev/null
> Garbage collection statistics:
> heap size: 160.31 MiB
> allocated: 1440.70 MiB
> GC times: 39
> time spent in GC: 4.51 seconds (46% of user time)
>
> real 0m7.534s
> user 0m9.747s
> sys 0m0.167s
> $ time GUIX_PROFILING=gc guix environment pigx-scrnaseq --search-paths
> >/dev/null
> Garbage collection statistics:
> heap size: 168.31 MiB
> allocated: 2111.71 MiB
> GC times: 53
> time spent in GC: 6.92 seconds (45% of user time)
>
> real 0m12.100s
> user 0m15.517s
> sys 0m0.198s
>
>
> Commit 78daf9e02e5bc51f91488d8237cab2050cc060cf optimizes
> ‘coalesce-duplicate-inputs’, which was quadratic in the number of inputs (!).
> After that change, I get:
>
> $ time GUIX_PROFILING=gc ./pre-inst-env guix environment pigx-scrnaseq
> --search-paths --no-grafts >/dev/null
> Garbage collection statistics:
> heap size: 168.31 MiB
> allocated: 716.58 MiB
> GC times: 24
> time spent in GC: 2.65 seconds (40% of user time)
>
> real 0m5.720s
> user 0m6.708s
> sys 0m0.149s
> $ time GUIX_PROFILING=gc ./pre-inst-env guix environment pigx-scrnaseq
> --search-paths >/dev/null
> Garbage collection statistics:
> heap size: 160.31 MiB
> allocated: 1387.96 MiB
> GC times: 42
> time spent in GC: 5.87 seconds (43% of user time)
>
> real 0m10.821s
> user 0m13.513s
> sys 0m0.198s
>
> Could you tell me if it improves the situation for you?
*Now* my experience is like yours:
--8<---------------cut here---------------start------------->8---
$ guix describe
Generation 9 Jul 27 2021 12:35:05 (current)
guix d0ec739
repository URL: https://git.savannah.gnu.org/git/guix.git
branch: master
commit: d0ec73907c2995034a34339f4a7c2c72c2e21fea
time GUIX_PROFILING=gc guix time-machine --commit=3217a04 -- environment
pigx-scrnaseq --search-paths >/dev/null
Garbage collection statistics:
heap size: 176.31 MiB
allocated: 2107.82 MiB
GC times: 52
time spent in GC: 5.26 seconds (23% of user time)
real 0m20.471s
user 0m22.605s
sys 0m0.372s
$ time GUIX_PROFILING=gc guix environment pigx-scrnaseq --search-paths
>/dev/null
Garbage collection statistics:
heap size: 152.31 MiB
allocated: 1367.16 MiB
GC times: 40
time spent in GC: 3.25 seconds (21% of user time)
real 0m14.701s
user 0m15.698s
sys 0m0.361s
--8<---------------cut here---------------end--------------->8---
But why was it occurring before? The only I thing I can think of is that
I didn't have everything in the store first. Is there a way I can prune
just the relevant items from the store to test this?
>
> It’s not the end of the road, but it should be an improvement.
>
> Thanks,
> Ludo’.
--
Sarah