Date: Sun, 27 Jan 2013 20:09:43 -0500 From: Brian Wallace <nightstrike9809@...il.com> To: john-dev@...ts.openwall.com Subject: Re: Proposed optimizations to pwsafe When I applied the opencl optimization, I only saw minor improvements compared to the CUDA improvements. I found that was kind of weird, because it was basically the same changes to the code. On Sun, Jan 27, 2013 at 7:58 PM, magnum <john.magnum@...hmail.com> wrote: > On 28 Jan, 2013, at 1:41 , Solar Designer <solar@...nwall.com> wrote: > > On Sun, Jan 27, 2013 at 07:22:19PM -0500, Brian Wallace wrote: > >> Ok, I'll do those changes. I haven't done much cuda/ocl coding in the > >> past, so it might take me a short while to get up to speed on what works > >> best, although I have a good background in C and hash cracking > >> optimization. What kind of benchmarks are we getting on pwsafe-opencl > vs > >> hashcat. > > > > Apparently, hashcat's speed is ~500k on HD 7970. hashkill is at ~480k: > > > > http://twitter.com/gat3way/status/294968226209726464/photo/1 > > > > We're getting 355k: > > > > > (The match of OpenCL and CUDA speed is curious. I did not tune THREADS > > and BLOCKS in cuda_pwsafe.h, and was compiling for the default of sm_10. > > Perhaps better speed is possible with some tuning.) > > The OpenCL format currently only auto-tunes local work-size (THREADS) so > it too runs at suboptimal conditions. The global work-size defauls to the > same figure the CUDA format use. It does support LWS/GWS environment > variables though: > > $ GWS=$((256*1024)) ../run/john -t -fo:pwsafe-opencl -plat=1 > OpenCL platform 1: AMD Accelerated Parallel Processing, 2 device(s). > Device 0: Tahiti (AMD Radeon HD 7900 Series) > Local worksize (LWS) 64, Global worksize (GWS) 262144 > Benchmarking: Password Safe SHA-256 [OpenCL]... DONE > Raw: 362411 c/s real, 78643K c/s virtual > > No huge difference though. > > In bleeding, Claudio has added a shared function for tuning GWS. I haven't > had time to try it out yet. > > magnum > Content of type "text/html" skipped
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