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Date: Thu, 27 Aug 2015 13:35:24 +0300
From: Solar Designer <>
Subject: Re: LWS and GWS auto-tuning

On Thu, Aug 27, 2015 at 01:37:17AM +0200, magnum wrote:
> On 2015-08-26 09:52, Solar Designer wrote:
> >I've just added "export GOMP_SPINCOUNT=10000" to /etc/profile.d/
> >on super, which isn't nearly as good, but doesn't have the bad
> >side-effects for the scenarios I mentioned above.  It should greatly
> >reduce the fluctuation of OpenMP benchmarks most of the time.
> I could not get DMG-opencl to benchmark after this (I assume that was 
> the reason). It was hanging indefinitely (hours) in CPU post-processing. 

Weird.  Should we revert making GOMP_SPINCOUNT=10000 the default, or
adjust the number?

> I now set affinity 0-31 and all was fine again.
> BTW I have changed all formats to skip CPU post-processing during 
> auto-tune. There are cons but, I think, mainly pros.

Sounds good.


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