From 9e93bf8428f5b5417f104a62a38555386de99da4 Mon Sep 17 00:00:00 2001
From: Weiqun Zhang <weiqunzhang@lbl.gov>
Date: Tue, 18 Jun 2024 21:55:52 -0700
Subject: [PATCH] Update CI

* Bump up actions' version

* Use ccache and github cache
---
 .github/workflows/c-linter.yml             |  4 +-
 .github/workflows/ci.yml                   | 41 ++++++++++++--
 .github/workflows/cleanup-cache-postpr.yml | 40 ++++++++++++++
 .github/workflows/cleanup-cache.yml        | 63 ++++++++++++++++++++++
 .github/workflows/cuda-ci.yml              | 36 ++++++++++++-
 .github/workflows/docs.yml                 |  2 +-
 .github/workflows/gcc.yml                  | 37 ++++++++++++-
 .github/workflows/hip.yml                  | 40 ++++++++++++--
 .github/workflows/macos.yml                | 35 +++++++++++-
 .github/workflows/post-pr.yml              | 20 +++++++
 .github/workflows/style.yml                |  4 +-
 .github/workflows/sycl.yml                 | 40 +++++++++++++-
 .github/workflows/windows.yml              |  2 +-
 13 files changed, 347 insertions(+), 17 deletions(-)
 create mode 100644 .github/workflows/cleanup-cache-postpr.yml
 create mode 100644 .github/workflows/cleanup-cache.yml
 create mode 100644 .github/workflows/post-pr.yml

diff --git a/.github/workflows/c-linter.yml b/.github/workflows/c-linter.yml
index 179e0f98..2a7d447b 100644
--- a/.github/workflows/c-linter.yml
+++ b/.github/workflows/c-linter.yml
@@ -5,7 +5,7 @@ jobs:
   cpp-linter:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: true
 
@@ -30,7 +30,7 @@ jobs:
         run: python3 Submodules/cpp-linter-action/run_on_changed_files.py ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }} -header-filter=Source/ -ignore-files="AMReX|GoogleTest" -run-linter
 
       - name: Archive clang tidy report
-        uses: actions/upload-artifact@v1
+        uses: actions/upload-artifact@v4
         with:
           name: clang-tidy-report
           path: clang-tidy-report.txt
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index aff4f6b8..9859100f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,7 +24,7 @@ jobs:
 
     steps:
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
@@ -39,12 +39,24 @@ jobs:
         # Install MPI
         ${{matrix.install_deps}}
 
+    - name: Install CCache
+      run: Submodules/AMReX/.github/workflows/dependencies/dependencies_ccache.sh
+
+    - name: Set Up Cache
+      uses: actions/cache@v4
+      with:
+        path: ~/.cache/ccache
+        key: ccache-${{ github.workflow }}-${{ github.job }}-git-${{ github.sha }}
+        restore-keys: |
+             ccache-${{ github.workflow }}-${{ github.job }}-git-
+
     - name: Configure CMake
       run: |
         cmake \
           -B${{runner.workspace}}/REMORA/build-${{matrix.os}} \
           -DCMAKE_INSTALL_PREFIX:PATH=${{runner.workspace}}/REMORA/install \
           -DCMAKE_BUILD_TYPE:STRING=Debug \
+          -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
           -DREMORA_DIM:STRING=3 \
           -DREMORA_ENABLE_MPI:BOOL=ON \
           -DREMORA_ENABLE_TESTS:BOOL=ON \
@@ -56,8 +68,16 @@ jobs:
 
     - name: Build
       run: |
+        export CCACHE_COMPRESS=1
+        export CCACHE_COMPRESSLEVEL=10
+        export CCACHE_MAXSIZE=600M
+        ccache -z
+
         cmake --build ${{runner.workspace}}/REMORA/build-${{matrix.os}} --parallel ${{env.NPROCS}};
 
+        ccache -s
+        du -hs ~/.cache/ccache
+
     - name: Regression Tests
       run: |
         ctest -L regression -VV
@@ -74,16 +94,31 @@ jobs:
     #     cd ..
     #     gcovr -g -k -r . --xml regressioncov.html  # -v
     # - name: Success artifacts
-    #   uses: actions/upload-artifact@v3
+    #   uses: actions/upload-artifact@v4
     #   if: success()
     #   with:
     #     name: build-and-test
     #     path: |
     #       ${{runner.workspace}}/REMORA/regressioncov.html
     # - name: Failing test artifacts
-    #   uses: actions/upload-artifact@v3
+    #   uses: actions/upload-artifact@v4
     #   if: failure()
     #   with:
     #     name: build-and-test
     #     path: |
     #       ${{runner.workspace}}/REMORA/regressioncov.html
+
+  save_pr_number:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Save PR number
+        env:
+          PR_NUMBER: ${{ github.event.number }}
+        run: |
+          echo $PR_NUMBER > pr_number.txt
+      - uses: actions/upload-artifact@v4
+        with:
+          name: pr_number
+          path: pr_number.txt
+          retention-days: 1
diff --git a/.github/workflows/cleanup-cache-postpr.yml b/.github/workflows/cleanup-cache-postpr.yml
new file mode 100644
index 00000000..9a2ffb0f
--- /dev/null
+++ b/.github/workflows/cleanup-cache-postpr.yml
@@ -0,0 +1,40 @@
+name: CleanUpCachePostPR
+
+on:
+  workflow_run:
+    workflows: [PostPR]
+    types:
+      - completed
+
+jobs:
+  CleanUpCcacheCachePostPR:
+    name: Clean Up Ccache Cache Post PR
+    runs-on: ubuntu-latest
+    permissions:
+      actions: write
+      contents: read
+    env:
+      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Clean up ccache
+        run: |
+          gh extension install actions/gh-actions-cache
+
+          REPO=${{ github.repository }}
+
+          gh run download ${{ github.event.workflow_run.id }} -n pr_number
+          pr_number=`cat pr_number.txt`
+          BRANCH=refs/pull/${pr_number}/merge
+
+          # Setting this to not fail the workflow while deleting cache keys.
+          set +e
+
+          keys=$(gh actions-cache list -L 100 -R $REPO -B $BRANCH | cut -f 1)
+          # $keys might contain spaces. Thus we set IFS to \n.
+          IFS=$'\n'
+          for k in $keys
+          do
+            gh actions-cache delete "$k" -R $REPO -B $BRANCH --confirm
+          done
+          unset IFS
diff --git a/.github/workflows/cleanup-cache.yml b/.github/workflows/cleanup-cache.yml
new file mode 100644
index 00000000..3cf2c548
--- /dev/null
+++ b/.github/workflows/cleanup-cache.yml
@@ -0,0 +1,63 @@
+name: CleanUpCache
+
+on:
+  workflow_run:
+    workflows: [REMORA CI, REMORA CUDA CI, REMORA CI (hip), REMORA CI (sycl), Linux GCC, MacOS]
+    types:
+      - completed
+
+jobs:
+  CleanUpCcacheCache:
+    name: Clean Up Ccache Cache for ${{ github.event.workflow_run.name }}
+    runs-on: ubuntu-latest
+    permissions:
+      actions: write
+      contents: read
+    env:
+      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Clean up ccache
+        run: |
+          gh extension install actions/gh-actions-cache
+
+          REPO=${{ github.repository }}
+
+          # push or pull_request or schedule or ...
+          EVENT=${{ github.event.workflow_run.event }}
+
+          # Triggering workflow run name (e.g., LinuxClang)
+          WORKFLOW_NAME="${{ github.event.workflow_run.name }}"
+
+          if [[ $EVENT == "pull_request" ]]; then
+            gh run download ${{ github.event.workflow_run.id }} -n pr_number
+            pr_number=`cat pr_number.txt`
+            BRANCH=refs/pull/${pr_number}/merge
+          else
+            BRANCH=refs/heads/${{ github.event.workflow_run.head_branch }}
+          fi
+
+          # Setting this to not fail the workflow while deleting cache keys.
+          set +e
+
+          # In our cache keys, substring after `-git-` is git hash, substring
+          # before that is a unique id for jobs (e.g., `ccache-LinuxClang-configure-2d`).
+          # The goal is to keep the last used key of each job and delete all others.
+
+          # something like ccache-LinuxClang-
+          keyprefix="ccache-${WORKFLOW_NAME}-"
+
+          cached_jobs=$(gh actions-cache list -L 100 -R $REPO -B $BRANCH --key "$keyprefix" | awk -F '-git-' '{print $1}' | sort | uniq)
+
+          # cached_jobs is something like "ccache-LinuxClang-configure-1d ccache-LinuxClang-configure-2d".
+          # It might also contain spaces. Thus we set IFS to \n.
+          IFS=$'\n'
+          for j in $cached_jobs
+          do
+            old_keys=$(gh actions-cache list -L 100 -R $REPO -B $BRANCH --key "${j}-git-" --sort last-used | cut -f 1 | tail -n +2)
+            for k in $old_keys
+            do
+              gh actions-cache delete "$k" -R $REPO -B $BRANCH --confirm
+            done
+          done
+          unset IFS
diff --git a/.github/workflows/cuda-ci.yml b/.github/workflows/cuda-ci.yml
index 0ef6f48f..9fc77e1d 100644
--- a/.github/workflows/cuda-ci.yml
+++ b/.github/workflows/cuda-ci.yml
@@ -23,21 +23,55 @@ jobs:
         uses: styfle/cancel-workflow-action@0.6.0
         with:
           access_token: ${{github.token}}
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - name: Prepare CUDA environment
         run: Submodules/AMReX/.github/workflows/dependencies/dependencies_nvcc.sh ${{matrix.cuda_ver}}
+      - name: Install CCache
+        run: Submodules/AMReX/.github/workflows/dependencies/dependencies_ccache.sh
+      - name: Set Up Cache
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/ccache
+          key: ccache-${{ github.workflow }}-${{ github.job }}-git-${{ github.sha }}
+          restore-keys: |
+               ccache-${{ github.workflow }}-${{ github.job }}-git-
       - name: Configure and build
         run: |
+          export CCACHE_COMPRESS=1
+          export CCACHE_COMPRESSLEVEL=10
+          export CCACHE_MAXSIZE=600M
+          ccache -z
+
           export PATH=/usr/local/nvidia/bin:/usr/local/cuda/bin:${PATH}
           export LD_LIBRARY_PATH=/usr/local/nvidia/lib:/usr/local/nvidia/lib64:/usr/local/cuda/lib64:${LD_LIBRARY_PATH}
           which nvcc || echo "nvcc not in PATH!"
           cmake -Bbuild-${{matrix.cuda_pkg}} \
             -DCMAKE_BUILD_TYPE:STRING=RelWithDebInfo \
+            -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
+            -DCMAKE_CUDA_COMPILER_LAUNCHER=ccache \
             -DAMReX_CUDA_ERROR_CROSS_EXECUTION_SPACE_CALL=ON \
             -DAMReX_CUDA_ERROR_CAPTURE_THIS=ON \
             -DREMORA_DIM:STRING=3 \
             -DREMORA_ENABLE_MPI:BOOL=OFF \
             -DREMORA_ENABLE_CUDA:BOOL=ON .
           cmake --build build-${{matrix.cuda_pkg}} -- -j $(nproc)
+
+          ccache -s
+          du -hs ~/.cache/ccache
+
+  save_pr_number:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Save PR number
+        env:
+          PR_NUMBER: ${{ github.event.number }}
+        run: |
+          echo $PR_NUMBER > pr_number.txt
+      - uses: actions/upload-artifact@v4
+        with:
+          name: pr_number
+          path: pr_number.txt
+          retention-days: 1
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 1ecbfdfd..039c1059 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Dependencies
         run: |
diff --git a/.github/workflows/gcc.yml b/.github/workflows/gcc.yml
index d884a188..89a7d178 100644
--- a/.github/workflows/gcc.yml
+++ b/.github/workflows/gcc.yml
@@ -12,19 +12,36 @@ jobs:
     runs-on: ubuntu-20.04
     # env: {CXXFLAGS: "-fno-operator-names -Werror -Wall -Wextra -Wpedantic -Wnull-dereference -Wfloat-conversion -Wshadow -Woverloaded-virtual"}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
     - name: Install Dependencies
       run: Submodules/AMReX/.github/workflows/dependencies/dependencies.sh
 
+    - name: Install CCache
+      run: Submodules/AMReX/.github/workflows/dependencies/dependencies_ccache.sh
+
+    - name: Set Up Cache
+      uses: actions/cache@v4
+      with:
+        path: ~/.cache/ccache
+        key: ccache-${{ github.workflow }}-${{ github.job }}-git-${{ github.sha }}
+        restore-keys: |
+             ccache-${{ github.workflow }}-${{ github.job }}-git-
+
     - name: Configure Project and Generate Build System
       run: |
+        export CCACHE_COMPRESS=1
+        export CCACHE_COMPRESSLEVEL=10
+        export CCACHE_MAXSIZE=300M
+        ccache -z
+
         cmake \
           -B${{runner.workspace}}/REMORA/build \
           -DCMAKE_INSTALL_PREFIX:PATH=${{runner.workspace}}/REMORA/install \
           -DCMAKE_BUILD_TYPE:STRING=Debug \
+          -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
           -DREMORA_DIM:STRING=3 \
           -DREMORA_ENABLE_MPI:BOOL=ON \
           -DREMORA_ENABLE_TESTS:BOOL=ON \
@@ -32,6 +49,9 @@ jobs:
           -DREMORA_ENABLE_FCOMPARE:BOOL=ON \
           ${{github.workspace}};
 
+        ccache -s
+        du -hs ~/.cache/ccache
+
     - name: Compile and Link
       run: |
         cmake --build ${{runner.workspace}}/REMORA/build --parallel 2 --verbose
@@ -40,3 +60,18 @@ jobs:
       run: |
         ctest -L regression -VV
       working-directory: ${{runner.workspace}}/REMORA/build
+
+  save_pr_number:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Save PR number
+        env:
+          PR_NUMBER: ${{ github.event.number }}
+        run: |
+          echo $PR_NUMBER > pr_number.txt
+      - uses: actions/upload-artifact@v4
+        with:
+          name: pr_number
+          path: pr_number.txt
+          retention-days: 1
diff --git a/.github/workflows/hip.yml b/.github/workflows/hip.yml
index 068a0739..a9a06fde 100644
--- a/.github/workflows/hip.yml
+++ b/.github/workflows/hip.yml
@@ -28,15 +28,31 @@ jobs:
     # NOTE: -Werror was removed because REMORA specifically had a lot of warnings. It will be a separate task to go through and fix them all...
     env: {CXXFLAGS: "-Wall -Wextra -Wpedantic -Wnull-dereference -Wfloat-conversion -Wshadow -Woverloaded-virtual -Wextra-semi -Wunreachable-code -Wno-deprecated-declarations -Wno-gnu-zero-variadic-macro-arguments -Wno-pass-failed"}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
     - name: Dependencies
       run: Submodules/AMReX/.github/workflows/dependencies/dependencies_hip.sh
 
+    - name: Install CCache
+      run: Submodules/AMReX/.github/workflows/dependencies/dependencies_ccache.sh
+
+    - name: Set Up Cache
+      uses: actions/cache@v4
+      with:
+        path: ~/.cache/ccache
+        key: ccache-${{ github.workflow }}-${{ github.job }}-git-${{ github.sha }}
+        restore-keys: |
+             ccache-${{ github.workflow }}-${{ github.job }}-git-
+
     - name: Build & Install
       run: |
+        export CCACHE_COMPRESS=1
+        export CCACHE_COMPRESSLEVEL=10
+        export CCACHE_MAXSIZE=300M
+        ccache -z
+
         source /etc/profile.d/rocm.sh
         hipcc --version
         which clang
@@ -52,6 +68,7 @@ jobs:
           -DCMAKE_VERBOSE_MAKEFILE=ON                   \
           -DCMAKE_INSTALL_PREFIX:PATH=${{runner.workspace}}/REMORA/install \
           -DCMAKE_BUILD_TYPE:STRING=RelWithDebInfo \
+          -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
           -DREMORA_DIM:STRING=3 \
           -DREMORA_ENABLE_MPI:BOOL=ON \
           -DREMORA_ENABLE_HIP:BOOL=ON \
@@ -74,6 +91,9 @@ jobs:
         # make -j ${{env.NPROCS}};
         make -j 2;
 
+        ccache -s
+        du -hs ~/.cache/ccache
+
     # - name: Regression Tests
     #   run: |
     #     ctest -L regression -VV
@@ -99,17 +119,31 @@ jobs:
     #     directory: ${{runner.workspace}}/REMORA
 
     - name: Success artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       if: success()
       with:
         name: build-and-test
         path: |
           ${{runner.workspace}}/REMORA/regressioncov.xml
     - name: Failing test artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       if: failure()
       with:
         name: build-and-test
         path: |
           ${{runner.workspace}}/REMORA/regressioncov.xml
 
+  save_pr_number:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Save PR number
+        env:
+          PR_NUMBER: ${{ github.event.number }}
+        run: |
+          echo $PR_NUMBER > pr_number.txt
+      - uses: actions/upload-artifact@v4
+        with:
+          name: pr_number
+          path: pr_number.txt
+          retention-days: 1
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 8b2af2f2..fbd65c5c 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -12,13 +12,21 @@ jobs:
     runs-on: macos-latest
     # env: {CXXFLAGS: "-fno-operator-names -Werror -Wall -Wextra -Wpedantic -Wnull-dereference -Wfloat-conversion -Wshadow -Woverloaded-virtual"}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
     - name: Install Dependencies
       run: Submodules/AMReX/.github/workflows/dependencies/dependencies_mac.sh
 
+    - name: Set Up Cache
+      uses: actions/cache@v4
+      with:
+        path: ~/Library/Caches/ccache
+        key: ccache-${{ github.workflow }}-${{ github.job }}-git-${{ github.sha }}
+        restore-keys: |
+             ccache-${{ github.workflow }}-${{ github.job }}-git-
+
     - name: Configure Project and Generate Build System
       run: |
         cmake \
@@ -26,6 +34,7 @@ jobs:
           -DBUILD_SHARED_LIBS:BOOL=TRUE \
           -DCMAKE_CXX_COMPILER_LAUNCHER=$(which ccache) \
           -DCMAKE_BUILD_TYPE:STRING=Debug \
+          -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
           -DREMORA_DIM:STRING=3 \
           -DREMORA_ENABLE_MPI:BOOL=TRUE \
           -DREMORA_ENABLE_TESTS:BOOL=TRUE \
@@ -35,9 +44,33 @@ jobs:
 
     - name: Compile and Link
       run: |
+        export CCACHE_COMPRESS=1
+        export CCACHE_COMPRESSLEVEL=10
+        export CCACHE_MAXSIZE=250M
+        export CCACHE_SLOPPINESS=time_macros
+        ccache -z
+
         cmake --build ${{runner.workspace}}/REMORA/build --parallel 2 --verbose
 
+        du -hs ~/Library/Caches/ccache
+        ccache -s
+
     - name: CMake Tests # see file REMORA/Tests/CTestList.cmake
       run: |
         ctest -L regression -VV
       working-directory: ${{runner.workspace}}/REMORA/build
+
+  save_pr_number:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Save PR number
+        env:
+          PR_NUMBER: ${{ github.event.number }}
+        run: |
+          echo $PR_NUMBER > pr_number.txt
+      - uses: actions/upload-artifact@v4
+        with:
+          name: pr_number
+          path: pr_number.txt
+          retention-days: 1
diff --git a/.github/workflows/post-pr.yml b/.github/workflows/post-pr.yml
new file mode 100644
index 00000000..2768ef37
--- /dev/null
+++ b/.github/workflows/post-pr.yml
@@ -0,0 +1,20 @@
+name: PostPR
+on:
+  pull_request:
+    types:
+      - closed
+
+jobs:
+  cleanup:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Save PR number
+        env:
+          PR_NUMBER: ${{ github.event.number }}
+        run: |
+          echo $PR_NUMBER > pr_number.txt
+      - uses: actions/upload-artifact@v4
+        with:
+          name: pr_number
+          path: pr_number.txt
+          retention-days: 1
diff --git a/.github/workflows/style.yml b/.github/workflows/style.yml
index c699f2a6..223ce0f6 100644
--- a/.github/workflows/style.yml
+++ b/.github/workflows/style.yml
@@ -10,13 +10,13 @@ jobs:
   tabs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Tabs
         run: .github/workflows/style/check_tabs.sh
 
   trailing_whitespaces:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Trailing Whitespaces
         run: .github/workflows/style/check_trailing_whitespaces.sh
diff --git a/.github/workflows/sycl.yml b/.github/workflows/sycl.yml
index e8d8ed75..9046421c 100644
--- a/.github/workflows/sycl.yml
+++ b/.github/workflows/sycl.yml
@@ -13,15 +13,32 @@ jobs:
     name: oneAPI SYCL
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
     - name: Dependencies
       run: Submodules/AMReX/.github/workflows/dependencies/dependencies_dpcpp.sh
 
+    - name: Install CCache
+      run: Submodules/AMReX/.github/workflows/dependencies/dependencies_ccache.sh
+
+    - name: Set Up Cache
+      uses: actions/cache@v4
+      with:
+        path: ~/.cache/ccache
+        key: ccache-${{ github.workflow }}-${{ github.job }}-git-${{ github.sha }}
+        restore-keys: |
+             ccache-${{ github.workflow }}-${{ github.job }}-git-
+
     - name: Build
       run: |
+        export CCACHE_COMPRESS=1
+        export CCACHE_COMPRESSLEVEL=10
+        export CCACHE_MAXSIZE=250M
+        export CCACHE_DEPEND=1
+        ccache -z
+
         set +e
         source /opt/intel/oneapi/setvars.sh
         set -e
@@ -31,6 +48,7 @@ jobs:
           -DCMAKE_VERBOSE_MAKEFILE=ON                   \
           -DCMAKE_INSTALL_PREFIX:PATH=${{runner.workspace}}/REMORA/install \
           -DCMAKE_BUILD_TYPE:STRING=RelWithDebInfo \
+          -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
           -DREMORA_DIM:STRING=3 \
           -DREMORA_ENABLE_MPI:BOOL=ON \
           -DREMORA_ENABLE_SYCL:BOOL=ON \
@@ -40,4 +58,22 @@ jobs:
           -DCMAKE_C_COMPILER=$(which icx) \
           -DCMAKE_CXX_COMPILER=$(which icpx) \
           -DCMAKE_CXX_STANDARD=17
-        make -j 2;
+        make -j 2
+
+        ccache -s
+        du -hs ~/.cache/ccache
+
+  save_pr_number:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Save PR number
+        env:
+          PR_NUMBER: ${{ github.event.number }}
+        run: |
+          echo $PR_NUMBER > pr_number.txt
+      - uses: actions/upload-artifact@v4
+        with:
+          name: pr_number
+          path: pr_number.txt
+          retention-days: 1
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 30d9d921..ee4f629b 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -11,7 +11,7 @@ jobs:
     name: WIN32 MSVC@19.29
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true