Fix interop tests: replace MPMD with individual mpiexec runs#5
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The MPMD launch mode (mpiexec -n 1 prog1 : -n 1 prog2) does not share MPI_COMM_WORLD across programs with MPICH, causing each process to see size=1. Also, Julia MPI.jl first-time precompilation inside mpiexec caused 30+ minute hangs in CI. Changes: - Run each language test independently with mpiexec -n 2 - Add Julia Project.toml and precompile MPI.jl before test runs - Add 300s timeout for Julia tests in run_interop.sh - Add 30-minute job timeout in CI workflow - Track per-test pass/fail status with proper exit codes Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
mpiexec -n 2per language, fixing MPICH compatibility (MPMD does not shareMPI_COMM_WORLDacross programs)Project.tomland precompile MPI.jl before test runs to avoid 30+ minute precompilation hangs inside mpiexecTest plan
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