Date: Tue, 26 Jun 2012 20:00:17 +0800 From: myrice <qqlddg@...il.com> To: john-dev@...ts.openwall.com Subject: Re: async key transfers to GPU On Tue, Jun 26, 2012 at 5:13 PM, myrice <qqlddg@...il.com> wrote: > On Mon, Jun 25, 2012 at 3:07 AM, Solar Designer <solar@...nwall.com> wrote: >> myrice - >> Yes, I did not suggest to use multiple streams. I am not familiar with >> this, but Lukas was able to have data transfers to GPU overlap with >> computation on GPU by interleaving these inside crypt_all(). I am >> suggesting an improvement upon this where you'd only need two chunks for >> (potentially) full efficiency, whereas Lukas' inside-crypt_all() >> approach would need more chunks to get close to full efficiency (but not >> reach it). >> >> Please do try this out and post your results. >> > > I split the memcpyH2D into 2. One in set_key(), one in crypt_all(). > Others remain the same. > With 1/4 long password, there are ~4M and ~3M improvement in many > salts and one salt. > ======Before============= > [12:35:02 myrice] run $ ./john -te=1 -fo=xsha512-cuda > Benchmarking: Mac OS X 10.7+ salted SHA-512 [CUDA]... DONE > Many salts: 61086K c/s real, 61652K c/s virtual > Only one salt: 17476K c/s real, 17096K c/s virtual > ======After=============== > [12:35:53 myrice] run $ ./john -te=1 -fo=xsha512-cuda > Benchmarking: Mac OS X 10.7+ salted SHA-512 [CUDA]... DONE > Many salts: 65278K c/s real, 65925K c/s virtual > Only one salt: 20695K c/s real, 21254K c/s virtual > Sorry, what I just got is wrong I think. Now with many salts, only ~500K improvement and with one salt, there is ~500K reduction. Will try split GPU call in crypt_all() and multi-stream later. =======Before============= Benchmarking: Mac OS X 10.7+ salted SHA-512 [CUDA]... DONE Many salts: 61086K c/s real, 61086K c/s virtual Only one salt: 20695K c/s real, 20695K c/s virtual =======After=============== Benchmarking: Mac OS X 10.7+ salted SHA-512 [CUDA]... DONE Many salts: 61652K c/s real, 61652K c/s virtual Only one salt: 20164K c/s real, 20695K c/s virtual Thanks myrice
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