Date: Thu, 23 Feb 2012 21:54:23 +0100 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: intel OpenCL (for CPU) "review" I had a look at Intel's OpenCL SDK today. This one makes your Intel CPU (or better, all CPUs and cores) work just like a GPU with OpenCL. For some odd reason it does not support any of Intel's GPUs yet. To my utter surprise, it installed without pain and worked like a champ with the first OpenCL formats I tried. Performance is actually better than our (thin dynamic) SSE2 version. I'm not sure how optimised the latter is. Anyway this was on my three years old Core2 Duo laptop. I really did not expect that. $ ../run/john -test -fo:phpass-opencl OpenCL Platforms: 1 OpenCL Platform: <<<Intel(R) OpenCL>>> 1 device(s), using device: <<<Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz>>> Compilation log: Build started Kernel <phpass> was successfully vectorized Done. Optimal Group work Size = 4 Benchmarking: PHPASS-OPENCL [PORTABLE-MD5]... DONE Raw: 17388 c/s real, 8735 c/s virtual $ ../run/john -test -fo:phpass-md5 Benchmarking: PHPass MD5 [SSE2i 2x4x3]... DONE Raw: 15936 c/s real, 15778 c/s virtual However, it turned out I was lucky picking phpass - all other OpenCL formats emits warnings like "Kernel <cryptmd5> was not vectorized" during run-time compilation and they do not perform that well. Hopefully this can be fixed. I really wonder why phpass is fine but not the others. Anyway this is much more promising than I thought! And despite bad performance, all formats do work fine, which means you can do some testing or development on a machine lacking a hefty GPU card. The SDK comes in RPM format from Intel but conversion to dpkg with alien is trouble free. Here's an example: http://mhr3.blogspot.com/2011/05/opencl-on-ubuntu.html BTW Samuele, I got the same LWS enumeration problem when trying this... magnum
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