On Monday, 19 February 2018 at 05:54:53 UTC, Dmitry Olshansky wrote:
The operation is trivial and dataset is rather small. In such cases SIMD with eg array ops is the way to go:
result[] = values[] * values2[];


Yes, absolutely right :)

I make a simple example to understand why the threads are not scaling in the way i thought they would. I imagine that, if one core work is done in 200ms a 4 core work will be done in 50ms, plus some overhead, since they are working on separate block of memory, without need of sync, and without false sharing, etc (at least I think i donĀ“t have this problem here).

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