Date: Sat, 25 Apr 2015 23:53:15 +0200 From: Agnieszka Bielec <bielecagnieszka8@...il.com> To: john-dev@...ts.openwall.com Subject: Re: [GSoC] John the Ripper support for PHC finalists 2015-04-25 23:33 GMT+02:00 Solar Designer <solar@...nwall.com>: > On Sun, Apr 26, 2015 at 12:31:49AM +0300, Solar Designer wrote: >> On Sat, Apr 25, 2015 at 10:28:31PM +0200, Agnieszka Bielec wrote: >> > 2015-04-25 21:20 GMT+02:00 Solar Designer <solar@...nwall.com>: >> > > "4 GPU units" sounded weird and confusing to me. >> > > If you put a hash of a known password in a text file, and put the >> > > password somewhere down a wordlist, and run "john" with pomelo-opencl >> > > against that, will it crack the hash? >> > >> > It works >> >> Can you explain how/why it works? I am probably missing something. >> I would expect it to fail most of the time. > > Oh, maybe it happens to work precisely because those 4 work-items tend > to be part of the same SIMD vector in hardware, so with current OpenCL > drivers they happen to be "guaranteed" to be ready at the same time? Did you mean CPU, not GPU?? Sorry I forgot to mention that it works on GPU because instructions are executed at the same time but this fails on CPU. I was focused only on GPU because coalescing decreased the speed on CPU significantly and if somebody want opencl on CPU they should use a old version
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