Use hashing to speed up expensive MPI checks

Resolves #353 (closed).

requested review from @mtr

assigned to @mtr

Btw. this is untested

I think @kjako can run a realistic test for us :) Still, we might want to add a small optimize_KL test to our MPI unit tests...

I will try it out and let you know!

seems to work!

added 1 commit

• 75f10273 - Use hashing to speed up expensive MPI checks

Compare with previous version

Great! I like the change; it's backward compatible and really minimal.

@mtr Do you want to do the merge? :)

I don't mind ;)

enabled an automatic merge when the pipeline for 75f10273 succeeds

merged

mentioned in commit 2a38ebd7