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Date: Tue, 2 Aug 2011 09:11:08 +0200
From: Lukas Odzioba <>
Subject: Re: cryptmd5cuda

> This is puzzling.  As far as I'm aware, they're supposed to be faster on
> NVidia as well.  How did this change affect code size?  Did the code
> size reduce with the fewer-ops F and G functions?
Yes, there is reduction in ptx code (

> Perhaps you have some other bottleneck that you're hitting.
I tried to test speed only F and G, and the difference in speed was even bigger.

> That's OK, but it's 3 times slower than the benchmark you have posted on
> the wiki, right?  So is there a 3x performance hit for actual cracking
> as compared to --test?
Yes, and I need to find why.

> 100k c/s is probably achievable on your i3-2100 CPU if you do a more
> optimal build (see above) and use all CPU cores at once.  I am not
> asking you to do that; I merely point out that the speedup with a GPU is
> still questionable, unfortunately.


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