Re: CCL:re: Perf. of Alpha vs. R10k
On Sep 23, 3:43pm, Chuck (aka chazix), 508-493-1399 (DTN 223-1399) wrote:
> Subject: CCL:re: Perf. of Alpha vs. R10k
> I don't follow this forum, but a colleague forwarded Dr. van der Spoel's
> notes. Was the Fortran code that was posted (routine FORLJC, with a test
> harness) the same code that produced a timing of 31 seconds on a 400MHz
> On my system, it runs in less than 4 seconds, either with the options
> Dr. van der Spoel gave, or with just "f90 -fast -tune host
It runs in 1.3 seconds on an Indigo2 R10K machine (1 MB cache) with -Ofast,
or 1.8 seconds using the compile options listed. His 30 second time was
presumably for the whole program. It sounds like the R10K SGI machines are
still significantly faster than the alpha machines even with the test code.
The R10K chips were a BIG jump in performance over the previous R4xxx
from SGI, so this isn't that far from possibility.
Dr. Daniel L. Severance dan -8 at 8- sage.syntex.com *****************
Research Scientist Work phone:(650) 354-7509 Note the Change
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