added Perlmutter CI option

.github/workflows/CI.yml

@@ -1,34 +1,31 @@
 name: CI
+
 on:
   push:
-    branches:
-      - main
+    branches: [ main ]
     tags: ['*']
   pull_request:
   workflow_dispatch:
+
 concurrency:
-  # Skip intermediate builds: always.
-  # Cancel intermediate builds: only if it is a pull request build.
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
 jobs:
+  # --- GitHub-hosted CI ---
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60
-    permissions: # needed to allow julia-actions/cache to proactively delete old caches that it has created
+    permissions:
       actions: write
       contents: read
     strategy:
       fail-fast: false
       matrix:
-        version:
-          - '1.11'
-          - 'lts'
-        os:
-          - ubuntu-latest
-        arch:
-          - x64
+        version: [ '1.11', 'lts' ]
+        os: [ ubuntu-latest ]
+        arch: [ x64 ]
     steps:
       - uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@v2
@@ -43,3 +40,93 @@ jobs:
         with:
           files: lcov.info
           token: ${{ secrets.CODECOV_TOKEN }}
+
+  # Perlmutter GPU CI job ---
+  perlmutter-gpu-tests:
+    name: Julia on Perlmutter GPU - ${{ github.event_name }}
+    runs-on: ubuntu-latest
+    timeout-minutes: 120
+    permissions:
+      actions: write
+      contents: read
+
+    env:
+      PERLMUTTER_HOST: ${{ secrets.PERLMUTTER_HOST || 'perlmutter.nersc.gov' }}
+      NERSC_QOS: ${{ secrets.NERSC_QOS || 'regular' }}
+      JULIA_MODULE: ${{ secrets.JULIA_MODULE || 'julia/1.11.1' }}
+      JOB_TIME: ${{ secrets.JOB_TIME || '00:30:00' }}
+      JULIA_NUM_THREADS: "8"
+
+    steps:
+      - name: Check out repo
+        uses: actions/checkout@v4
+
+      - name: Package source tarball
+        shell: bash
+        run: |
+          T="$RUNNER_TEMP/repo.tgz"
+          tar -C "$GITHUB_WORKSPACE" --exclude-vcs -czf "$T" .
+          ls -lh "$T"
+
+      - name: Install SSH Key
+        uses: shimataro/ssh-key-action@v2
+        with:
+          name: id_ed25519
+          key: ${{ secrets.PERLMUTTER_SSH_KEY }}
+          known_hosts: 'ssh-keyscan -t ed25519 "$PERLMUTTER_HOST"'
+          # config: ${{ secrets.SSH_CONFIG }} # Optional: for custom SSH config
+
+      - name: Add Server to Known Hosts
+        run: ssh-keyscan -H ${{ env.PERLMUTTER_HOST }} >> ~/.ssh/known_hosts
+
+#      - name: Copy files with SCP
+#        uses: appleboy/scp-action@v0.1.7 # Or the latest version
+#        with:
+#          host: ${{ env.PERLMUTTER_HOST }}
+#          username: ${{ secrets.PERLMUTTER_USER }}
+#          key: '~/.ssh/id_ed25519'
+#          source: "$GITHUB_WORKSPACE" # Files to copy from your repo
+#          target: '~/repo.tgz' # Destination on the server
+          # port: 22 # Optional: if using a non-standard SSH port
+
+      - name: Copy source to Perlmutter
+        run: |
+          scp -i ~/.ssh/id_ed25519 "$RUNNER_TEMP/repo.tgz" \
+            "${{ secrets.PERLMUTTER_USER }}@${{ env.PERLMUTTER_HOST }}:~/repo.tgz"
+
+      - name: Submit Slurm GPU job
+        id: submit
+        run: |
+          # creates sbatch file, submits, waits, produces lcov.info
+          # writes job_meta with JOB_ID and WORKDIR
+          # ...
+          echo "job_id=..." >> "$GITHUB_OUTPUT"
+          echo "workdir=..." >> "$GITHUB_OUTPUT"
+
+      - name: Retrieve artifacts from Perlmutter
+        run: |
+          jid="${{ steps.submit.outputs.job_id }}"
+          wdir="${{ steps.submit.outputs.workdir }}"
+          scp -i ~/.ssh/id_ed25519 \
+            "${{ secrets.PERLMUTTER_USER }}@${{ env.PERLMUTTER_HOST }}:${wdir}/lcov.info" ./lcov.info || true
+          scp -i ~/.ssh/id_ed25519 \
+            "${{ secrets.PERLMUTTER_USER }}@${{ env.PERLMUTTER_HOST }}:${wdir}/slurm-${jid}.out" ./slurm-${jid}.out || true
+          scp -i ~/.ssh/id_ed25519 \
+            "${{ secrets.PERLMUTTER_USER }}@${{ env.PERLMUTTER_HOST }}:${wdir}/slurm-${jid}.err" ./slurm-${jid}.err || true
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          files: lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: true
+
+      - name: Upload SLURM logs
+        uses: actions/upload-artifact@v4
+        with:
+          name: perlmutter-slurm-logs
+          path: |
+            slurm-*.out
+            slurm-*.err
+            lcov.info
+          if-no-files-found: warn