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Date: Thu, 20 Aug 2015 04:53:55 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: PHC: Argon2 on GPU

On Wed, Aug 19, 2015 at 07:41:02PM +0200, Agnieszka Bielec wrote:
> ptxas info    : Function properties for FillSegment
> ptxas         .     0 bytes stack frame, 17400 bytes spill stores,
> 19352 bytes spill loads
> ptxas info    : Function properties for GenerateAddresses
> ptxas         .     0 bytes stack frame, 7780 bytes spill stores,
> 11648 bytes spill loads

The spills in FillSegment and GenerateAddresses are pretty bad.  Where
do they come from, and why so much?  In FillSegment you use 1 KB per
work-item for addresses[], in GenerateAddresses you use 2 KB for two
blocks.  GenerateAddresses is called from FillSegment, so adds its
private memory needs on top of FillSegment's.

Alexander

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