Date: Fri, 24 Mar 2017 22:14:44 +0100 From: Patrick Proniewski <p+password@...atpro.net> To: john-users@...ts.openwall.com Cc: Frank Dittrich <frank.dittrich@...lbox.org> Subject: Re: GPU performance On 24 mars 2017, at 19:41, Frank Dittrich wrote: > Am 24.03.2017 um 18:30 schrieb Patrick Proniewski: >> Thanks, it's way faster: >> >> $ ./john -test -format=raw-sha1-opencl --mask >> Device 1: GeForce GTX 1080 >> ../.. >> Raw: 5778M c/s real, 5778M c/s virtual >> >> Does it mean I have to use mask mode to get this kind of performance, and other modes would run in the 87M c/s range? > > Yes, you have to use --mask to get optimal OpenCL performance for very > fast hash formats. > But you don't have to use standalone mask mode, you can also use hybrid > modes, i.e., combine --mask with other modes. > > While hashcat's GPU formats generate all password candidates on the GPU, > john generates the candidates on the CPU, except for very fast hash > formats which support --mask directly on the GPU. > That way, --mask avoids a data transfer bottleneck which otherwise hurts > GPU performance for those very fast hash formats. Thanks for this explanation. I'll have to bench slow hashes to see how it behaves with and without --mask. I don't use --mask so often, at least not during first cracking sessions. patpro
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