Greg Smith wrote:
Yeb Havinga wrote:
model name : AMD Phenom(tm) II X4 940 Processor @ 3.00GHz
cpu cores : 4
stream compiled with -O3
Function Rate (MB/s) Avg time Min time Max time
Triad: 5395.1815 0.0089 0.0089 0.0089
I'm not sure if Yeb's stream was compiled to use MPI correctly though,
because I'm not seeing "Number of Threads" in his results. Here's
what works for me:
gcc -O3 -fopenmp stream.c -o stream
And then you can set:
export OMP_NUM_THREADS=4
Then I get the following. The rather wierd dip at 5 threads is
consistent over multiple tries:
Number of Threads requested = 1
Function Rate (MB/s) Avg time Min time Max time
Triad: 5378.7495 0.0089 0.0089 0.0090
Number of Threads requested = 2
Function Rate (MB/s) Avg time Min time Max time
Triad: 6596.1140 0.0073 0.0073 0.0073
Number of Threads requested = 3
Function Rate (MB/s) Avg time Min time Max time
Triad: 7033.9806 0.0069 0.0068 0.0069
Number of Threads requested = 4
Function Rate (MB/s) Avg time Min time Max time
Triad: 7007.2950 0.0069 0.0069 0.0069
Number of Threads requested = 5
Function Rate (MB/s) Avg time Min time Max time
Triad: 6553.8133 0.0074 0.0073 0.0074
Number of Threads requested = 6
Function Rate (MB/s) Avg time Min time Max time
Triad: 6803.6427 0.0071 0.0071 0.0071
Number of Threads requested = 7
Function Rate (MB/s) Avg time Min time Max time
Triad: 6895.6909 0.0070 0.0070 0.0071
Number of Threads requested = 8
Function Rate (MB/s) Avg time Min time Max time
Triad: 6931.3018 0.0069 0.0069 0.0070
Other info: DDR2 800MHz ECC memory
MB: 790FX chipset (Asus m4a78-e)
regards,
Yeb Havinga
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