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Message-ID: <cfdd5e8c65878261051873414ed141d4@smtp.hushmail.com>
Date: Sat, 25 Apr 2015 22:20:12 +0200
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: [GSoC] John the Ripper support for PHC finalists
On 2015-04-25 21:20, Solar Designer wrote:
> Also, I think you're over-using "unsigned long", such as for loop
> variables. This may have performance impact on GPUs. You should prefer
> "uint" except where a wider type is actually needed.
I have seen significant slowdowns from using long on GPU where not
needed. All current GPUs are 32-bit. Not sure if the compiler will ever
optimize the use of long down to int - except for loops.
> You may also try "#pragma unroll" and "#pragma unroll N" before loops,
> see e.g. cryptsha512_kernel_GPU.cl for examples.
Do try that, but I am yet to see it making any difference at all. I
think Claudio disagrees with me.
magnum
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