john-dev - md5crypt-opencl optimizations

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Date: Thu, 10 Jan 2013 02:45:02 +0100
From: magnum <john.magnum@...hmail.com>
To: "john-dev@...ts.openwall.com" <john-dev@...ts.openwall.com>
Subject: md5crypt-opencl optimizations

Before:

   Benchmarking: md5crypt [CUDA]... DONE
   Raw:    732298 c/s real, 732298 c/s virtual

   Using device 0: GeForce GTX 570
   Benchmarking: md5crypt [OpenCL]... DONE
   Raw:    232672 c/s real, 234057 c/s virtual

   Using device 0: Tahiti
   Benchmarking: md5crypt [OpenCL]... DONE
   Raw:    241920 c/s real, 3518K c/s virtual

Basically I just got rid of global memory use in the inner loop and reduced register waste (context buffer was using ints for storing single chars). OpenCL now:

   Using device 0: GeForce GTX 570
   Benchmarking: md5crypt [OpenCL]... DONE
   Raw:    892405 c/s real, 892405 c/s virtual

   Using device 0: Tahiti
   Benchmarking: md5crypt [OpenCL]... DONE
   Raw:    607171 c/s real, 8601K c/s virtual

Still far from Hashcat, but a little less embarrasing now. I have no idea why Tahiti is so slow here. Maybe we should use local memory.

magnum

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