Mark Hahn wrote:
Here's a 4 core Woodcrest system with 4 sticks of 2 GB 667 MHz FB-dimms:
Function Rate (MB/s) Avg time Min time Max time
Copy: 4813.2590 0.2663 0.2659 0.2675
Scale: 4826.2181 0.2656 0.2652 0.2662
Add: 5244.0135 0.3664 0.3661 0.3669
Triad: 5244.3106 0.3665 0.3661 0.3671
This was a pathscale compiled stream executable with openmp using 4
threads.
kinda sucks, doesn't it? here's what I get for a not-new dual-275 with
8x1G PC3200 (I think):
Function Rate (MB/s) RMS time Min time Max time
Copy: 5714.6837 0.0840 0.0840 0.0841
Scale: 5821.0766 0.0825 0.0825 0.0826
Add: 6437.8226 0.1119 0.1118 0.1120
Triad: 6414.2079 0.1123 0.1123 0.1124
Bill and I passed a few emails off the list and it seems that he's heard
reports of up to 10 GB/s. I tried on 2 different Woodcrest systems (one
from Dell, one directly from Intel) here and they both report back
similar numbers. It seems that the fortran version of the program with
pathscale 2.3 (the numbers I reported above) reports different numbers
than the C version of the program with pathscale 2.3:
Function Rate (MB/s) Avg time Min time Max time
Copy: 6129.2441 0.2090 0.2088 0.2097
Scale: 6138.1509 0.2087 0.2085 0.2091
Add: 5935.6727 0.3236 0.3235 0.3237
Triad: 5972.4347 0.3217 0.3215 0.3221
and the C version with Intel 9.1:
Function Rate (MB/s) Avg time Min time Max time
Copy: 6145.6340 0.2084 0.2083 0.2090
Scale: 4830.1172 0.2652 0.2650 0.2658
Add: 5289.7542 0.3632 0.3630 0.3638
Triad: 5296.5246 0.3629 0.3625 0.3640
Thanks,
--
Jason Holmes
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