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September 2012

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Subject:
Re: User proc uses all RAM+swap => kernel panic - shouldn't OS not allow?
From:
Konstantin Olchanski <[log in to unmask]>
Reply To:
Konstantin Olchanski <[log in to unmask]>
Date:
Thu, 13 Sep 2012 10:34:52 -0700
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On Thu, Sep 13, 2012 at 04:32:00PM +0200, Stephan Wiesand wrote:
> Hello Winnie,
> 
> On Sep 13, 2012, at 16:01 , Winnie Lacesso wrote:
> 
> > Several times over past few years I've seen user processes "go mad" 
> > (programming error) & use all RAM, then all swap (as ganglia so vividly 
> > shows), then the box ends up at a kernel panic.
> > (Server OS is SL5.x 64-bit BTW)
> 
> we rarely see panics in these cases. The box just becomes unusable. Which effectively makes no difference though.
> 

yes, same here. often, the system starts paging and becomes unresponsive (user pushes the reset button)
well before OOM kills the offending process.

-- 
Konstantin Olchanski
Data Acquisition Systems: The Bytes Must Flow!
Email: olchansk-at-triumf-dot-ca
Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada

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