Reference documentation for deal.II version Git 8113613837 2020-09-22 13:45:23 -0500
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internal::VectorImplementation Namespace Reference


unsigned int minimum_parallel_grain_size = 4096

Variable Documentation

◆ minimum_parallel_grain_size

unsigned int internal::VectorImplementation::minimum_parallel_grain_size = 4096

If we do computations on vectors in parallel (say, we add two vectors to get a third, and we do the loop over all elements in parallel), then this variable determines the minimum number of elements for which it is profitable to split a range of elements any further to distribute to different threads.

This variable is available as a global writable variable in order to allow the testsuite to also test the parallel case. By default, it is set to several thousand elements, which is a case that the testsuite would not normally encounter. As a consequence, in the testsuite we set it to one – a value that's hugely unprofitable but definitely tests parallel operations.

Definition at line 34 of file