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Date: Wed, 15 Aug 2012 08:40:21 +0530
From: Dhiru Kholia <>
Subject: Re: OpenCL implementation of GPG format

On Wed, Aug 15, 2012 at 2:07 AM, magnum <> wrote:
> On 2012-08-14 18:25, Dhiru Kholia wrote:
>> I have written an OpenCL implementation of GPG format. Currently, the
>> speedup is very low (9x). The compiler complains about register
>> spilling. According to
>> speedups upto 100x can be achieved.
> Cool. Have you tried it on bull? Maybe its cards have register files
> large enough. Feel free to commit it to magnum-jumbo for easy testing.

Code has been committed to magnum-jumbo. Benchmarks from bull system,

dhiru@...l:~/OpenCL/src$ ../run/john -fo:gpg-opencl -t  -pla=1
OpenCL platform 1: AMD Accelerated Parallel Processing, 2 device(s).
Using device 0: Tahiti
Benchmarking: OpenPGP / GnuPG Secret Key [OpenCL]... DONE
Raw:	63705 c/s real, 83781 c/s virtual

dhiru@...l:~/OpenCL/src$ ../run/john -fo:gpg-opencl -t
OpenCL platform 0: NVIDIA CUDA, 1 device(s).
Using device 0: GeForce GTX 570
Benchmarking: OpenPGP / GnuPG Secret Key [OpenCL]... DONE
Raw:	58329 c/s real, 58576 c/s virtual

No complaints about register spilling on bull. Still the speedups
obtained are quite low. Will try to profile and see where the
bottlenecks are.


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