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Rework vtkSMPThreadPool of the STDThread SMP backend

Alexy Pellegrini requested to merge alexy.pellegrini/vtk:smp-stdthread-rework into master

This is a rework of the STDThread backend for SMP.

Major changes are:

  • SMP calls no longer create threads. A common, global, thread pool is shared between all calls.
  • The new backend supports nested SMP calls without spawning additional threads while still having parallelism

This leads to much better performances for small SMP calls and a better scalability in other cases!

Edited by Alexy Pellegrini

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