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Date: Wed, 26 Aug 2015 11:06:17 +0300
From: Solar Designer <>
Subject: Re: LWS and GWS auto-tuning

On Tue, Aug 25, 2015 at 08:36:44PM +0200, magnum wrote:
> Worst/best 10 for Tahiti (oldoffice failing):

> Ratio:	0.83409 real, 1.02941 virtual	salted-sha1-opencl:Many salts

This one doesn't auto-tune.  Gives same speeds to me.

> Ratio:	0.85046 real, 0.85934 virtual	sxc-opencl, StarOffice .sxc:Raw
> Ratio:	0.90867 real, 0.78394 virtual	blockchain-opencl, blockchain My 
> Wallet:Raw

These two don't auto-tune.  They use OpenMP.  With
GOMP_CPU_AFFINITY=0-31, they give stable same speeds to me, regardless
of recent changes (obviously).

So all of the worst results for Tahiti (10% or greater slowdown seen in
magnum's posting) are actually spurious, not regressions of the
auto-tuning changes.


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