Lisandro Dalcin

@hzhou @jsquyres Would it be possible for the two major MPI implementations to agree on a let say `int MPIX_Query_features(MPI_Info*)` routine that would fill `MPI_Info` with implementatipn-defined key/value pairs to...

* `mpi_memory_alloc_kinds` is now standard in MPI 4.1. * IIUC, MPICH 4.2 will support MPI 4.1 and add support for `mpi_memory_alloc_kinds`. * Other MPI implementations could add support for it,...

@VictorEijkhout I've also reported a bunch of issues to Intel folks. They could reproduce [issues with spawn](https://community.intel.com/t5/Intel-oneAPI-HPC-Toolkit/Issues-running-mpi4py-testsuite-on-GitHub-Actions/m-p/1432107/highlight/true#M10081). Have you tried latest Intel MPI 2021.8?

> Intel is basically telling me to "go away" if it's not reproducible with OneAPI Oh, but... isn't version 2021.8 part of oneAPI? AFAICT, that's the latest version. Can you...

@VictorEijkhout Any updates from your side regarding this issue?

> Hm. My Intel ticket has disappeared. LOL! > Doing something with MPIPoolExecutor with Intel 2023 runs, but later hangs. What happens if you `export MPI4PY_RC_RECV_MPROBE=0` before running? Does it...

> Open MPI has the same problem, `export MPI4PY_RC_RECV_MPROBE=0` doesn't help. @antoscha That suggestion is specific to Intel MPI. Regarding Open MPI, what version and installed from where? Can you...

OK, I can reproduce issues with Open MI 4.1.4 from Fedora 38 and mpi4py@master , there is a deadlock at a `recv()` call. The issue goes away with `export MPI4PY_RC_RECV_MPROBE=0`....

> Maybe it's worth to report the regression to the Open MPI project? Some time ago I decided to track testing the development branches with daily frequency and report issues...

If this is about editable installs, then there is no automatic way, that how `pip --no-build-isolation` is supposed to work, it assumes the build requirements are already installed. For the...