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 E. Metzger [EMAIL PROTECTED] _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
