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Date: Mon, 21 May 2012 16:06:58 +0200
From: Lukas Odzioba <lukas.odzioba@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: OpenCL vs. CUDA CPU usage

2012/5/16 Solar Designer <solar@...nwall.com>:
> This is just an observation: somehow with CUDA we're fully wasting an
> entire CPU core per GPU, whereas with OpenCL we're only using some CPU
> time on one core:

This might be related to our problem:
Quote:
"Solution was trivial — disable BLOCKING_SYNC if there more than one
GPU at system. It means that each CUDA GPU will eat one CPU core but…
who cares about CPU cores, right?"

From: http://www.golubev.com/blog/?p=70

Lukas

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