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Re: High disk I/O causes unkillable Processes.(Was Linux + XFS + SCS I =

To: "Gonyou, Austin" <austin@xxxxxxxxxxxxxxx>
Subject: Re: High disk I/O causes unkillable Processes.(Was Linux + XFS + SCS I = Problems?)
From: Keith Owens <kaos@xxxxxxxxxxxxxxxxx>
Date: Sun, 04 Nov 2001 23:06:04 +1100
Cc: "'linux-xfs@xxxxxxxxxxx'" <linux-xfs@xxxxxxxxxxx>
In-reply-to: Your message of "Sat, 03 Nov 2001 22:40:35 MDT." <85063BBE668FD411944400D0B744267A8886E8@AUSMAIL>
Sender: owner-linux-xfs@xxxxxxxxxxx
On Sat, 3 Nov 2001 22:40:35 -0600 , 
"Gonyou, Austin" <austin@xxxxxxxxxxxxxxx> wrote:
>3. spew-fork.pl will cause a runaway system lock about 50% of the time, a
>XFS shutdown and kernel oops 25%of the time and nothing another 25% of the
>time. Either the IO is just too great when writing to 4 files at a time, or
>something else is wrong. I've seen perl break systems plenty of times
>before, but the problem here though is that it is successful about 25% of
>the time. Something is inconsistent I think.

I am running a slightly modified spew.pl in a tight loop on a dual
Celeron 466 (Abit BP6), 2.4.14-pre7-xfs, no acl or quota, ncr53c875, a
pair of IBM SCSI drivers, no raid.  It runs for me with no problems.

  while (true) ; do rm -f spew.out ; \time ./spew.pl ; done

It runs out of space after a while and aborts, but it does not hang for
me.  Sorry, I cannot reproduce your problem.

#!/usr/bin/perl -w

$|=1;
open(FD, ">>spew.out");
while (1) {
print FD "asdklfasd;kfjsad;kfjs;dlj a;sdlkfnas,nfp9ibvp98ay085hq325l;mndfg'adfa
'sd;lmf,m/,sd\fasdfna.,mdnf.m,ansdflkjanfoiuahsel;kjrqwe\as\df]adfh\||PPOt'rq[tjwq.,mnt/><ZXDNF{OLPIAHSEMN>M<Nl;kjahestlkjahsdklfmsd;lifqpownj;n;lakfn;KH;LKH;LKGJAPSOIJ";
die "print failed $!" if $!;
}
close FD;



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