From: Jan Dreyer (dreyerja@uni-paderborn.de)
Date: Thu Apr 03 2008 - 09:10:26 EST
Hi @ll,
thanks for answers to
Bill Voight
przemol
Darren Dunham
Roberto Fratelli
They mostly pointed to the very usefull scripts included in the dtrace
toolkit, available at
http://opensolaris.org/os/community/dtrace/dtracetoolkit/
Brendan Gregg published some scripts on
http://www.brendangregg.com/k9toolkit.html
Also very good is the guide on
http://www.sun.com/software/solaris/howtoguides/dtracehowto.jsp
I did'nt have had a lot process creation or forking.
After running 'topsyscall' and 'topsysproc' I identified some processes
that made a lot of reads and writes. But these applications didn't
change in the past months, so they were not likely the cause.
A look at the syslog showed that the automounter tried to mount
something on /net every minute. I disabled /net as we don't use it
anyway. But the performance issue still stayed.
Last (ugly) resort was to reboot the machine.
Till now (~2h) that did it. But as the behaviour wasn't persistent but
occured casually, I can't say, if we really got it.
Maybe tomorrow or so ...
Greetings
Jan Dreyer
Jan Dreyer wrote:
> Hi managers,
>
> we have a E3500 (5.10 Generic_127111-06) with some trouble completing
> it's job(s). The problem is, I can't identify the source of the dilemma.
>
> sar shows:
> 13:55:17 %usr %sys %wio %idle
> 13:55:19 11 89 0 0
> 13:55:20 10 88 0 2
> 13:55:24 10 89 0 1
> 13:55:26 10 89 0 1
> 13:55:27 9 91 0 0
> 13:55:29 6 94 0 0
> 13:55:31 4 96 0 0
>
> so the processes are in system mode about 85-99%! That's way too much.
> But I can't see, why this occurs. Obviously there is few IO, so this
> doesn't block.
>
> Dtrace seems the answer, but I have no idea which of the millions of
> screws I shall turn there ...
>
> Any hints here, where and how to look?
>
> Greetings and thanks in advance
> Jan Dreyer
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