Hi,

On Thu, Feb 17, 2022 at 10:05:29PM +0100, Mark Wielaard wrote:
> On Thu, Feb 17, 2022 at 08:46:01PM +0100, Marc via Gcc-rust wrote:
> >  ../gccrs/gcc/rust/hir -I ../../gccrs/gcc/rust/resolve -I 
> > ../../gccrs/gcc/rust/util -I ../../gccrs/gcc/rust/typecheck -I 
> > ../../gccrs/gcc/rust/lint 
> > ../../gccrs/gcc/rust/hir/tree/rust-hir-full-test.cc
> > command timed out: 1200 seconds without output running [b'make', b'-j4'], 
> > attempting to kill
> > process killed by signal 9
> > program finished with exit code -1
> > elapsedTime=1425.203557
> > 
> > Looks suspicious. Is it possible that the VM got stuck ?
> 
> It did indeed. The machine only has 4GB of memory and 2GB swap. With
> make -j4 there are 4 processes each taking ~1GB and it is just
> swapping:
> 
>   926 root      20   0       0      0      0 R  97.6   0.0 135:41.18 kswapd0
> 15794 buildbot  20   0 1539436 928056      0 D   2.4  24.5   1:41.92 cc1plus
> 15817 buildbot  20   0  781108 674280    328 D   2.4  17.8   1:08.31 cc1plus
> 15792 buildbot  20   0 1250264 763912    384 D   2.1  20.2   1:40.62 cc1plus
> 15800 buildbot  20   0 1427104 784820    132 D   2.1  20.7   1:41.67 cc1plus
> 
> I'll reconfigure with make -j3 to see if that helps.

It didn't. With -j3 the oom-killer kicks in (dunno why not with -j4):

[1643873.684998] Out of memory: Killed process 16625 (cc1plus) 
total-vm:1764740kB, anon-rss:1040744kB, file-rss:0kB, shmem-rss:0kB, UID:998 
pgtables:3464kB oom_score_adj:0
[1643873.992761] oom_reaper: reaped process 16625 (cc1plus), now anon-rss:0kB, 
file-rss:0kB, shmem-rss:0kB

So now using make -j2 which does succeed.
https://builder.wildebeest.org/buildbot/#/builders/58/builds/1655

Very odd. But apparently for some reason 4GB isn't enough anymore to
use -j3 or -j4. Which is unfortunate because this board doesn't take
more than 4GB memory.

Cheers,

Mark

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