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A__Hamid
Beginner
96 Views

Automatic Parallelization - same execution time with different number of threads

Hi all

I am doing some experiment on auto-parallelization tools on NAS benchmark, by using Intel icc V18 (FLAGS : -parallel -g -O2 ), even by changing the number of threads (export OMP_NUM_THREADS=4, 8 or 16) always I got the same execution time (it happened for all NAS benchmarks and not just for some of them) !!!

should I use any additional flag ???

 

Thanks

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2 Replies
Viet_H_Intel
Moderator
96 Views

Do you see the different execution time if you compile with GCC for 4, 8, 16 threads?

Thanks,

Viet 

McCalpinJohn
Black Belt
96 Views

You should look at the optimization reports to find out if the automatic parallelization was actually able to parallelize the important loops....

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