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Date: Fri, 18 Sep 2009 15:11:11 -0700
From: Steve Kargl <sgk@troutmask.apl.washington.edu>
To: "b. f." <bf1783@googlemail.com>
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Cc: jeff@FreeBSD.org, freebsd-amd64@FreeBSD.org
Subject: Re: new to amd64
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On Fri, Sep 18, 2009 at 09:49:57PM +0000, b. f. wrote:
> Steve Kargl wrote:
> >
> >If you are running any floating point intensive applications
> >and these applications are multithreaded, you may want to use
> >the 4BSD scheduler rathar than ULE.  The last time I tested
> >ULE with an MPI application, it display miserable performance
> >on a dual, quad-core opteron system.
> 
> Have you made any attempt to analyze this problem, or discussed it
> with the primary author of ULE?

yes and yes.

> If so, to what do you attribute the poor performance, and do you
> have any ideas on how to improve ULE performance in this context?

The only acceptable solution I found was to switch to 4BSD.

-- 
Steve