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Re: kern/40027 (pagedaemon loops on memory shortage)
On Wed, Dec 03, 2008 at 02:05:03PM +0000, Andrew Doran wrote:
> The following reply was made to PR kern/40027; it has been noted by GNATS.
> From: Andrew Doran <ad%NetBSD.org@localhost>
> To: gnats-bugs%netbsd.org@localhost
> Subject: Re: kern/40027 (pagedaemon loops on memory shortage)
> Date: Wed, 3 Dec 2008 14:04:57 +0000
> With this patch against -current and the test program, a dual CPU machine
> with 128MB RAM stalls during heavy paging activity, but eventually the
> memory hog process is killed and it recovers.
> Memory: 3728K Act, 2156K Inact, 500K Wired, 4484K Exec, 124K File, 95M Free
I still see the problem here:
load averages: 1.17, 0.86, 0.41; up 0+00:07:05 16:16:49
42 processes: 1 runnable, 40 sleeping, 1 on CPU
CPU states: 0.0% user, 0.0% nice, 97.1% system, 0.0% interrupt, 2.9% idle
Memory: 304M Act, 149M Inact, 5824K Wired, 8924K Exec, 21M File, 20K Free
Swap: 256M Total, 256M Used, 8K Free
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
0 root 126 0 0K 9568K pgdaemon 3:38 0.88% 0.88% [system]
10573 root 81 0 5904K 22M RUN 0:11 0.00% 0.00% cc1
18891 root 85 0 76K 4K wait 0:02 0.00% 0.00% <pbulk-build
3229 bouyer 43 0 96K 844K CPU 0:00 0.00% 0.00% top
Did you try writing large files while running the memory hog program ?
I found that producing dirty pages to the file cache while running short
or memory makes the problem much more likely to happen.
Manuel Bouyer, LIP6, Universite Paris VI.
NetBSD: 26 ans d'experience feront toujours la difference
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