Upstream suggests that debian should *not* compile python3-h5py against OpenMPI by default, and based on the current performance of the package in 2.10.0-2 I agree with them:
https://github.com/h5py/h5py/issues/1433#issuecomment-552640391 It's really quite annoying to have this package printing messages to stderr (not to mention the performance issues mentioned above and in #944617). This is a pretty critical package for a lot of scientific applications, and these new performance and messy output issues are proving to be quite problematic. Thanks for the attention. jamie.
