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Re:: vmstat and floating point exception [message #47140] Wed, 11 July 2012 00:45 Go to previous message
kir is currently offline  kir
Messages: 1645
Registered: August 2005
Location: Moscow, Russia
Senior Member

I barely remember there was a fix in the kernel related to this. I might be
wrong, but it's worth checking on a latest rhel6 stable or testing kernel.
11.07.2012 3:54 пользователь "Mark Johanson" <mjohanson@a2hosting.com>
написал:

> Linux solusvm.a2hosting.com 2.6.32-042stab053.5 #1 SMP Tue Mar 27
> vzctl version 3.3
> vswap is enabled
>
> Since upgrading to a 2.6.32 kernel one of our users noticed that they
> are occasionally getting a Floating Point Exception when running vmstat:
>
> [root@server ~]# vmstat 1 5
> procs -----------memory---------- ---swap-- -----io---- --system--
> -----cpu------
> r b swpd free buff cache si so bi bo in cs us sy
> id wa st
> 0 0 0 2048244 0 32816 0 0 0 2 0 7627 0 0
> 99 0 0
> 0 0 0 2048236 0 32816 0 0 0 0 0 110 0 0
> 100 0 0
> 0 0 0 2048236 0 32816 0 0 0 0 0 78 0 0
> 100 0 0
> 0 0 0 2048236 0 32816 0 0 0 0 0 91 0 0
> 100 0 0
> Floating point exception
>
> It doesn't happen every time as you can see here:
>
> [root@server ~]# vmstat 1 10
> procs -----------memory---------- ---swap-- -----io---- --system--
> -----cpu------
> r b swpd free buff cache si so bi bo in cs us sy
> id wa st
> 0 0 0 2068584 0 12472 0 0 0 0 0 1745 0 0
> 100 0 0
> 0 0 0 2068576 0 12472 0 0 0 0 0 82 0 0
> 100 0 0
> 0 0 0 2068576 0 12472 0 0 0 0 0 77 0 0
> 100 0 0
> 0 0 0 2068576 0 12472 0 0 0 0 0 109 0 0
> 100 0 0
> 0 0 0 2068576 0 12472 0 0 0 0 0 92 0 0
> 100 0 0
> 0 0 0 2068576 0 12472 0 0 0 0 0 80 0 0
> 100 0 0
> 0 0 0 2068576 0 12472 0 0 0 0 0 87 0 0
> 100 0 0
> 0 0 0 2068576 0 12472 0 0 0 0 0 66 0 0
> 100 0 0
> 0 0 0 2068588 0 12472 0 0 0 0 0 130 0 0
> 100 0 0
> 0 0 0 2068588 0 12472 0 0 0 0 0 72 0 0
> 100 0 0
>
> I have been able to replicate this issue in other OS templates (theirs
> is Ubuntu 11.10, but I have replicated in Ubuntu, Fedora, Centos,
> etc...) running the same kernel and vzctl version.
>
> I can not replicate this issue on the node.
>
> Wondering if anyone else has run across this issue and/or knows what
> might be causing it.
>


Kir Kolyshkin
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