linux-kernel - RE: Server process stalled during massive thread creation : scheduler problem ?

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Message-ID: <531F9EE7AD1E874595D59997FD3EAEED043D7947@COSSMGMBX05.EMAIL.CORP.TLD>
Date:	Tue, 16 Sep 2008 03:27:48 -0600
From:	"Cornelius, Martin (DWBI)" <Martin.Cornelius@...ths-heimann.com>
To:	<linux-kernel@...r.kernel.org>
Subject: RE: Server process stalled during massive thread creation : scheduler problem ?



Christopher Snook wrote:

> I would conclude that the application is severely broken, not the
server
> itself. The scheduler is trying to be fair.  Unless you're assigning 
> priorities, it has no way of knowing that those 1000 CPU hog processes
are
> less important than your netcat process.  Once those processes have
shown
> to be much longer-running than netcat, the kernel realizes that giving
> netcat priority is the the best approximation to ideal 
> shortest-time-to-completion-first scheduling, so netcat gets to run 
> whenever it's able.

> I think the scheduler is working correctly.  If you still see this
> behavior when you give your netcat process higher scheduler priority,
then
> we can talk about bugs.

Hi Chris, thanks for answering my question. I repeated the test, giving
the 'netcat' server a much higher priority than the load generators, and
indeed, the stalling disappeared.

 
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