Multithreaded tests #762
Description
Elmer is becoming increasingly multithreaded with OpenMP but none of the tests are executed with more than 1 threads (OMP_NUM_THREADS is not set).
An easy fix would be 5319f82 .
Are there drawbacks for setting OMP_NUM_THREADS=4 everywhere? Possibly (MPI) parallel tests might not like massive oversubscription of cores?
Also ctest is run with -j$(nproc) option for parallel execution of tests which causes oversubscription again but that might not be too big of an issue.