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Message-ID: <20150820015355.GA23094@openwall.com>
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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