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I use gcc 4.7.1
Enabling OpenMP option makes my 6 core CPU busy on all 6 of them.
Surprisingly on Time x Velocity = 10000 x 10 grid it takes longer them with
disabled OpenMp option and only single core working. I have got 230 seconds
vs 160 seconds. Besides optimizing wisdom of FFT takes forever with OpenMP.
on a grid Time x Velocity = 10000 x 100
with OpenMP execution time = 988 seconds
without = 1708 seconds
with 4 thread
on a grid Time x Velocity = 10000 x 100
with OpenMP execution time = 1036 seconds
without = 1603 seconds
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