Date: Tue, 19 Jul 2005 22:34:32 -0700 From: John-Mark Gurney <gurney_j@resnet.uoregon.edu> To: "Mikhail T." <mi@aldan.algebra.com> Cc: amd64@FreeBSD.org, stable@FreeBSD.org Subject: Re: OS suddenly VERY busy Message-ID: <20050720053432.GA62369@funkthat.com> In-Reply-To: <200507200419.j6K4Jpgd083006@blue.virtual-estates.net> References: <200507200419.j6K4Jpgd083006@blue.virtual-estates.net>
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Mikhail T. wrote this message on Wed, Jul 20, 2005 at 00:19 -0400:
> After a couple of huge tarball extracts (`make extract' in jdk14 and jdk15)
> I noticed, things are a little slower. During the extracts, the mouse was
> moving with visible jerks. Indeed, the system seems VERY busy:
>
> 11 users Load 1.18 1.52 1.40 Jul 20 00:14
>
> Mem:KB REAL VIRTUAL VN PAGER SWAP PAGER
> Tot Share Tot Share Free in out in out
> Act 1060360 105932 1341624 145252 151016 count
> All 1750432 115908 8911872 174532 pages
> zfod Interrupts
> Proc:r p d s w Csw Trp Sys Int Sof Flt cow 1277 total
> 4 1146 1819 345 443k 1640 672 266572 wire 4 irq1: atkb
^^^^
well, I'd say 443k syscalls/time interval isn't doing nothing...
[...]
> The machine is idle and is not doing anything in user-space according to both
> top and vmstat's "pigs" display.
the problem is that your machine is sooooo fast that all of the
processes that are running are exiting before they can be observed
by pigs or top (or even accumulate enough cpu time to be worth
showing)...
> Yet it is noticably slower. Trying to compile something pushes the load above
> 2. What is it doing?
>
> This is a single-CPU Opteron running:
>
> FreeBSD 5.4-STABLE #0: Fri Jun 10 09:11:30 EDT 2005 amd64
>
> The box has 2Gb of RAM, but NO SWAP.
run ps lax a few times, and notice which process is fork bombing your
box by seeing which process has the most changing children... (i.e.
the ppid, 3rd column, of the process that isn't in the next run)...
sort -n +1 -2 + diff will help find which ones...
ps lax | sort -n +1 -2 > tmpa; sleep 2; ps lax | sort -n +1 -2 > tmpb; diff tmpa tmpb
look at the ppid (3rd column) of any new or missing processes, and
you probably have your culprit...
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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