JuliaParallel / JuliaParallel/MPI.jl

Investigate need for `JULIA_CUDA_MEMORY_POOL=none`

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Description

One datapoint is that locally on OpenMPI 5, the test ran fine on one GPU.

There was a discussion elsewhere (maybe @maleadt remembers) if that flag is still needed or what MPI versions can now handle the new memory interface.

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