Run valgrind check in ci in parallel
Feature request
Currently, the valgrind check in the ci runs only in serial. I think we should run the check with mpi instead. The script should have the option to define the number of processes via the arguments. Maybe also an argument could be defined such that the output file is not deleted at the end.
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"Priority: high" Should be solved as soon as possible
"Priority: medium" Should be solved within half a year
"Priority: low" Should be solved eventually
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Depending on #1922
Depending on #1922
#1922 is now resolved :)