Perry E. Metzger wrote: > Prentice Bisbal <[EMAIL PROTECTED]> writes: >> Completely untrue. One of my colleagues, who does a lot of work with GPU >> processors for astrophysics calculations, was able to increase the >> performance of the MD5 algorithm by ~100x with about 1.5 days of work. > > That's rather surprising. MD5 is a pure integer algorithm, and is well > known for being unfriendly to vectorization. There is also extensive > work by Keromytis et al on the use of GPUs for accelerating > cryptographic operations, and I don't think they achieved anything > like that sort of performance improvement. > > I'll point out, by the way... > >> * GPU (single GeForce 8800 Ultra on cylon): >> 57,640,967.264473 hash/second > > ...that implies moving at least 3.7e9 bytes of data (MD5 > operates on blocks of 64 bytes) into the GPU per second, entirely > ignoring the 64 Feistel rounds within the GPU. Each round is 4 xors > and a rotate, and they can't be done in parallel, so we get a total of > about 1.8e10 integer ops (entirely ignoring the world shuffling) per > second. That's... rather a lot. > > Perry
Perry, I was just passing the information along from my colleague. I forwarded your response to him. Maybe he will reply himself and go into more detail about his findings for you. -- Prentice _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
