> As upstream point out in Issue#1433, this is not a bug in h5py. > > It is generated by OpenMPI, discussed in the bug #814451 that Graham > cited. > > The simplest workaround is to set > export OMPI_MCA_btl_base_warn_component_unused=0 > in the environment.
While the message may be coming from the underlying MPI library, it's on h5py for importing the guilty MPI library by default and therefore subjecting regular users to it. As was also mentioned upstream, debian should probably not be compiling against MPI by default, especially since it's now clear that it's causing a lot of other issues (#944769, #944617). These issues all trace back to the use of MPI by default.
