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Avoid segmentation faults in threaded code when using Intel MPI #742

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Avoid segmentation faults in threaded code when using Intel MPI #742

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8 changes: 8 additions & 0 deletions docs/src/knownissues.md
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Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,14 @@ ENV["UCX_ERROR_SIGNALS"] = "SIGILL,SIGBUS,SIGFPE"
```
at `__init__`. If set externally, it should be modified to exclude `SIGSEGV` from the list.

Similarly, Intel MPI would error if the above signal is raised ([#725](https://github.com/JuliaParallel/MPI.jl/issues/725)), resulting in a segmentation fault error like
```
[6950] signal (11.-6): Segmentation fault
in expression starting at /home/runner/work/MPI.jl/MPI.jl/test/test_threads.jl:18
ijl_gc_enable at /cache/build/default-amdci4-6/julialang/julia-release-1-dot-9/src/gc.c:3222
```
MPI.jl works around this problem by setting the environment variable `IPATH_NO_BACKTRACE` to `1`, unless already defined.

## CUDA-aware MPI

### Memory pool
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4 changes: 4 additions & 0 deletions src/MPI.jl
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Expand Up @@ -142,6 +142,10 @@ function __init__()
# default is "SIGILL,SIGSEGV,SIGBUS,SIGFPE"
ENV["UCX_ERROR_SIGNALS"] = "SIGILL,SIGBUS,SIGFPE"
end
# Similar problem with Intel MPI (issue #725).
if !haskey(ENV, "IPATH_NO_BACKTRACE")
ENV["IPATH_NO_BACKTRACE"] = "1"
end

if MPIPreferences.binary == "MPItrampoline_jll" && !haskey(ENV, "MPITRAMPOLINE_MPIEXEC")
ENV["MPITRAMPOLINE_MPIEXEC"] = API.MPItrampoline_jll.mpich_mpiexec_path
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