Allow OpenMPI_jll v5 (#875)

* Allow `OpenMPI_jll` v5

* [CI] Remove `test-spack-openmpi5` job and run `test-openmpi-jll` jobs only on 64-bit

32-bit systems aren't supported by upstream OpenMPI anymore.

* [CI] Allow oversubscription with OpenMPI v5

.github/workflows/UnitTests.yml

@@ -91,17 +91,16 @@ jobs:
           - "1.6"
           - "1"
           - "nightly"
-        julia_arch: [x64, x86]
-        exclude:
-          - os: macos-13
-            julia_arch: x86
+        julia_arch: [x64]
 
       fail-fast: false
     env:
       JULIA_MPI_TEST_BINARY: OpenMPI_jll
       JULIA_MPI_TEST_ABI: OpenMPI
       OMPI_MCA_btl_base_warn_component_unused: 0
       OMPI_MCA_rmaps_base_oversubscribe: true
+      # Allow oversubscription
+      PRTE_MCA_rmaps_default_mapping_policy: :oversubscribe
 
     runs-on: ${{ matrix.os }}
 
@@ -577,52 +576,3 @@ jobs:
         MPIPreferences.use_system_binary()
 
     - uses: julia-actions/julia-runtest@v1
-
-
-  # TODO: Can remove this once we can use OpenMPI_jll v5
-  test-spack-openmpi5:
-    timeout-minutes: 20
-    strategy:
-      matrix:
-        include:
-          - container: ghcr.io/juliaparallel/github-actions-buildcache:openmpi5-jq
-            name: "OpenMPI 5.0.2"
-
-      fail-fast: false
-
-    runs-on: ubuntu-22.04
-    container: ${{ matrix.container }}
-    name: "Test ${{ matrix.name }}"
-
-    env:
-      JULIA_MPI_TEST_BINARY: system
-      JULIA_MPI_TEST_ABI: OpenMPI
-      # Allow running as root
-      OMPI_ALLOW_RUN_AS_ROOT: 1
-      OMPI_ALLOW_RUN_AS_ROOT_CONFIRM: 1
-      # Allow oversubscription
-      PRTE_MCA_rmaps_default_mapping_policy: :oversubscribe
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v4
-
-    - uses: julia-actions/setup-julia@v1
-      with:
-        version: "1"
-
-    - uses: julia-actions/cache@v2
-    - name: add MPIPreferences
-      shell: julia --color=yes --project=. {0}
-      run: |
-        using Pkg
-        Pkg.develop(path="lib/MPIPreferences")
-        Pkg.precompile()
-
-    - name: use system MPI
-      shell: julia --color=yes --project=. {0}
-      run: |
-        using MPIPreferences
-        MPIPreferences.use_system_binary()
-
-    - uses: julia-actions/julia-runtest@v1

Project.toml

@@ -27,7 +27,7 @@ Libdl = "1"
 MPICH_jll = "4"
 MPIPreferences = "0.1.8"
 MPItrampoline_jll = "5"
-OpenMPI_jll = "4"
+OpenMPI_jll = "4, 5"
 PkgVersion = "0.3"
 PrecompileTools = "1.0.1"
 Requires = "~0.5, 1.0"