Re: Benefits of dual CPU for a web server

From: Robert Heller (heller_at_deepsoft.com)
Date: 01/24/05 

Date: Mon, 24 Jan 2005 23:58:24 +0100

  Chris Hope <blackhole@electrictoolbox.com>,
  In a message on Tue, 25 Jan 2005 11:09:16 +1300, wrote :

CH> Toby Inkster wrote:
CH>
CH> > Ignoramus18155 wrote:
CH> >
CH> >> How stable is dual CPU under linux. I do not want unpleasant
CH> >> surprises.
CH> >
CH> > [tai@ophelia ~]$ cat /proc/cpuinfo ; uptime
CH>
CH> [snip]
CH>
CH> > 21:09:48 up 53 days, 13:24, 5 users, load average: 94.02, 94.06,
CH> > 93.22
CH> >
CH> > (Excuse the high load levels. I seem to have a couple of runaway
CH> > processes that need bringing under control!)
CH>
CH> Yikes, those are high!

I once (unintentionally) created a worse load average recently.
Eventually the machine recovered *on its own*. None of the processes
where 'runaway', I just forked a rather lot of 'cp' commands -- I was
running some processing on a batch of files in a loop on a compute
server and was copying the 'results' from the local (fast) disk to a
slower (nfs) disk. Once the processing completed and the 'zillion'
backgrounded cp's finished, the maching settled down. The machine
actually remained responsive the whole time. Dual 2.2gig Optirons
running WBL 3.0-x86_64. (WBL 3.0 is a GPL release of RHEL 3.0).

Way back in the olden days, when I had a 66mhz '486Dx2, I had a bug in a
cron job and managed to *almost* lock the machine -- the cron job
behaved like a 'fork bomb'. This was with a either a 0.99 or 1.0 kernel
(don't remember which). No, I did NOT have to reboot. I just needed to
kill the 'head' of the processes and the machine settled down.

Linux has *always* been 'robust'.

CH>
CH> --
CH> Chris Hope - The Electric Toolbox - http://www.electrictoolbox.com/
CH>

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Robert Heller ||InterNet: heller@cs.umass.edu
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