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Date: Wed, 26 Aug 2015 09:22:02 +0300
From: Solar Designer <>
Subject: Re: 7z-opencl crashes with auto-tuning

On Tue, Aug 25, 2015 at 04:08:09PM +0200, magnum wrote:
> Long ago, we did:
> 1. tune LWS using some arbitrary GWS
> 2. tune GWS using LWS from 1
> This was never very good so we changed it a year ago or more to:
> 1. tune GWS using LWS=NULL
> 2. tune LWS using GWS from 1
> And now you added a third step, which obviously can make quite some 
> difference for some formats:
> 3. re-tune GWS using LWS from 2

I think step 2 (tune LWS) was missing for a while before my changes.
The LWS tuning code was in there, but it was dead code.


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