[gmx-users] Benchmarks, two questions
lindahl at csb.stanford.edu
Wed May 19 18:12:38 CEST 2004
> - How come the 32 bit gromacs binaries score relatively so well on the
> bit machines. Is there some special way in which the processor treats
> 32 bit operations?
SSE assembly loops.
I've actually translated them to 64-bit SSE, but it doesn't make things
any faster per se, so that's why I haven't bothered to backport them.
Given time, I might see if there is any smart way to use the 8 extra
registers, but don't count on more than ~10% extra speed in that case.
We're simply keeping the Opteron SSE unit pretty busy as it is, and 64
bit pointers doesn't help for less than 4e9 atoms :-)
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