Add cross-language MPI interop tests and update README#4
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- Add experimental/POC status, upstream merge goal, and Julia/Python motivation to README - Add MPMD-based interop tests: Rust + mpi4py + MPI.jl sharing MPI_COMM_WORLD under a single mpiexec - Add CI workflow for interop tests (.github/workflows/interop.yml) - Tests gracefully skip when Python/Julia deps are not installed Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
MPI_COMM_WORLDunder a singlempiexec.github/workflows/interop.ymlruns tests with MPICH and OpenMPI on UbuntuTest structure
All tests broadcast value 42 from rank 0 and verify on all ranks. Tests gracefully skip when Python/Julia deps are not installed.
Test plan
cargo build --example interop_testsucceedsGenerated with Claude Code