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Date: Sat, 11 Aug 2012 13:54:45 +0200
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: pwsafe-gpu
On 2012-08-11 13:00, magnum wrote:
> On 2012-08-11 02:38, Solar Designer wrote:
>> Lukas -
>>
>> As discussed on IRC, here are my changes to pwsafe-cuda. The most
>> important one is initialization of w[14]. This makes the problem go
>> away for me. Please implement similar changes to pwsafe-opencl.
>>
>> magnum - we need to get both sets of changes into the -fixes branch,
>> even though my patch happens to be against magnum-jumbo.
>
> Aye. This fixes all problems, though I will wait for Lukas patch before
> committing. Same changes to pwsafe-opencl give a 40% boost on GTX570!
> Though it's still a lot slower than the CUDA format despite being
> identical code - I figure that's mostly caused by inoptimal LWS/GWS figures.
It sure was:
magnum@...l:src [1.7.9-jumbo-6-fixes]$ ../run/john -t -fo:pwsafe-cuda
Benchmarking: Password Safe SHA-256 [CUDA]... DONE
Raw: 109574 c/s real, 110276 c/s virtual
magnum@...l:src [1.7.9-jumbo-6-fixes]$ ../run/john -t -fo:pwsafe-opencl
OpenCL platform 0: NVIDIA CUDA, 1 device(s).
Using device 0: GeForce GTX 570
Benchmarking: Password Safe SHA-256 [OpenCL]... DONE
Raw: 37948 c/s real, 37726 c/s virtual
-#define KEYS_PER_CRYPT 1024
+#define KEYS_PER_CRYPT 512*112
magnum@...l:src [1.7.9-jumbo-6-fixes]$ ../run/john -t -fo:pwsafe-opencl
OpenCL platform 0: NVIDIA CUDA, 1 device(s).
Using device 0: GeForce GTX 570
Benchmarking: Password Safe SHA-256 [OpenCL]... DONE
Raw: 128862 c/s real, 128862 c/s virtual
I just picked the number used in CUDA - I suppose it can be even better.
magnum
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