Date: Fri, 18 May 2012 20:52:24 +0800 From: myrice <qqlddg@...il.com> To: john-dev@...ts.openwall.com Subject: About Performance of Store Loaded Hashes/Salts on GPU Hi Solar, Samuele, The performance gains from storing loaded hashes/salts on GPU is mainly from reducing hashes/salts transfer from CPU to GPU I think. Here is q quick test I have done. Current xsha512-opencl/xsha512-cuda have cmp_all() on GPU. The hashes/salts are transferred to GPU when we invoke cmp_all()/crypt_all() respectively. So I commented out the hashes and salts copy code in cmp_all() and crypt_all(). Here is the result: Before: [11:36:43 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, 65278K c/s virtual Only one salt: 28973K c/s real, 28973K c/s virtual After: [11:36:43 myrice] run $ ./john -te=1 -fo=xsha512-cuda Benchmarking: Mac OS X 10.7+ salted SHA-512 [CUDA]... DONE Many salts: 65925K c/s real, 65925K c/s virtual Only one salt: 29491K c/s real, 29230K c/s virtual It seems these copys do not hurt performance a lot. Any ideas about this?
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