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Allow arbitrary thread numbers per work group in likwid-bench

Thomas Gruber requested to merge github/fork/ohlmann/bench_group_size into master

Created by: ohlmann

Up to now, different work groups must have the same thread number for likwid-bench to work properly. With this change, different work groups can have different numbers of threads, which is useful for e.g., when one wants to have 2 threads on the first socket and only one on the second.

Example: likwid-bench -t copy -w S0:10MB:2 -w S1:10MB:1

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