Date: Sun, 8 Jul 2012 12:36:14 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: Rotate and bitselect investigation On Sun, Jul 08, 2012 at 12:34:51PM +0530, Sayantan Datta wrote: > There was a small typo in the optimized kernel. Apparently you didn't > change from manual to bitselect in the SHA1_digest() function which is > called in the 10K iteration. Oh, indeed. Good catch. > Here's the new results with 1/4 of the KPC you used in the previous > benchmark. ... > Using device 0: GeForce GTX 570 ... > Benchmarking: M$ Cache Hash 2 (DCC2) PBKDF2-HMAC-SHA-1 [OpenCL]... DONE > Raw: 30481 c/s real, 30481 c/s virtual That's a 4% slowdown - is this solely because of the reduced KPC? > Using device 0: Tahiti ... > Benchmarking: M$ Cache Hash 2 (DCC2) PBKDF2-HMAC-SHA-1 [OpenCL]... DONE > Raw: 99801 c/s real, 99296 c/s virtual That's a 2% speedup, presumably due to bitselect(). I wonder what the speedup would be with the same KPC as before. Thanks, Alexander
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