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I have i7 Intel processor wit 4 cores. But system sees it like 8-core
machine because of HyperThreading.
I have some problems with performance. When I start a simulation with about
1000 particles and default OMP_NUM_THREAD option, I have about
10-11iter/sec, what is extremely low.
When I start the same simulation with OMP_NUM_THREAD=4, I get the speed
about 160-180 iter/sec.
Why is it so?