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perf(mpi): cap thread pools for MPI and document policy - #76

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lmoresi merged 2 commits into
underworldcode:developmentfrom
gthyagi:codex/mpi-thread-caps-only
Mar 10, 2026
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perf(mpi): cap thread pools for MPI and document policy#76
lmoresi merged 2 commits into
underworldcode:developmentfrom
gthyagi:codex/mpi-thread-caps-only

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@gthyagi

@gthyagi gthyagi commented Mar 10, 2026

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Cherry-picks only these commits from gthyagi:feature/boundary-integrals:\n- 014e97c perf(mpi): cap thread pools for MPI and document policy\n- d42f6b2 revert: restore uw wrapper from development\n\nThis keeps boundary-integral development/testing isolated in the original branch/PR.

gthyagi added 2 commits March 10, 2026 14:37
Apply MPI-safe default thread caps in the uw launcher and add a runtime oversubscription warning/policy in underworld3 import logic; document behavior and override controls in parallel-computing docs.

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@gthyagi

gthyagi commented Mar 10, 2026

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With this fix and OpenMPI on macOS, I am no longer seeing any CPU spikes (>100%).

@lmoresi
lmoresi merged commit ec5eb93 into underworldcode:development Mar 10, 2026
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@gthyagi
gthyagi deleted the codex/mpi-thread-caps-only branch April 8, 2026 01:47
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