Recently I benchmarked a Fortran based Scientific application on both Intel Xeon Quad core and AMD Opteron Quad core with RHEL 5. Following are the results:AMD-2.3GHz INTEL-2.33GHz 1. Serial 147.719 73.952 sec 2. Parallel 4 core 39.798 32.317 sec 3. Parallel 8 core 26.880 30.371 sec For AMD, I used GCC compiler(gfortran), which is released by AMD for its barcelona-AMD fam10 based processors.
that's a tiny bit misleading - I'm certain AMD would not suggest that their spin of GCC is superior to a commercial AMD-tuned compiler (eg Pathscale, PGI)
I'm not sure how to understand the numbers. it's not reasonable to expect AMD to be half the speed of Intel in serial. I'd probably assume that's due to poor optimization; the alternative is that the code's working set fits in Intel's cache(s), but not in AMD's (certainly possible). the scaling
numbers appear to support a cache-based interpretation: at 4c, the program is as in-cache as it can be but still has mandatory misses that eventually show AMD's memory-bandwidth advantage... _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
