From 34c5774e511ebb2e5e9672cb7381797c3cd6264e Mon Sep 17 00:00:00 2001
From: Andres Noetzli <andres.noetzli@gmail.com>
Date: Fri, 18 Jun 2021 21:07:10 -0700
Subject: [CI] Build with all available cores (#6768)

macOS virtual machines have three available cores but we were only using two of them for our CI. This commit changes the CI to retrieve the number of available cores and then to use that to number to build and test cvc5.
---
 .github/workflows/ci.yml | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 95c6c035c..2a41efb59 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -82,6 +82,7 @@ jobs:
         #
         # https://github.com/actions/runner/blob/master/docs/adrs/0278-env-context.md#dont-populate-the-env-context-with-environment-variables-from-runner-machine
         echo "image_version=$ImageVersion" >> $GITHUB_ENV
+        echo "num_proc=$(nproc)" >> $GITHUB_ENV
         echo "/usr/lib/ccache" >> $GITHUB_PATH
 
     # Note: macOS comes with a libedit; it does not need to brew-installed
@@ -103,6 +104,7 @@ jobs:
         #
         # https://github.com/actions/runner/blob/master/docs/adrs/0278-env-context.md#dont-populate-the-env-context-with-environment-variables-from-runner-machine
         echo "image_version=$ImageVersion" >> $GITHUB_ENV
+        echo "num_proc=$(sysctl -n hw.logicalcpu)" >> $GITHUB_ENV
         echo "/usr/local/opt/ccache/libexec" >> $GITHUB_PATH
 
     - name: Install Python Dependencies
@@ -191,14 +193,14 @@ jobs:
           --werror
 
     - name: Build
-      run: make -j2
+      run: make -j${{ env.num_proc }}
       working-directory: build
 
     - name: ccache Statistics
       run: ccache -s
 
     - name: Run CTest
-      run: make -j2 check
+      run: make -j${{ env.num_proc }} check
       env:
         ARGS: --output-on-failure -LE regress[${{ matrix.exclude_regress }}]
         CVC5_REGRESSION_ARGS: --no-early-exit
@@ -207,7 +209,7 @@ jobs:
 
     - name: Install Check
       run: |
-        make -j2 install
+        make -j${{ env.num_proc }} install
         echo -e "#include <cvc5/cvc5.h>\nint main() { cvc5::api::Solver s; return 0; }" > /tmp/test.cpp
         g++ -std=c++11 /tmp/test.cpp -I install/include -L install/lib -lcvc5
       working-directory: build
@@ -225,14 +227,14 @@ jobs:
         mkdir build
         cd build
         cmake .. -DCMAKE_PREFIX_PATH=$(pwd)/../../build/install/lib/cmake
-        make -j2
-        ctest -j2 --output-on-failure
+        make -j${{ env.num_proc }}
+        ctest -j${{ env.num_proc }} --output-on-failure
       working-directory: examples
 
     - name: Build Documentation
       if: matrix.build-documentation
       run: |
-        make -j2 docs-gh
+        make -j${{ env.num_proc }} docs-gh
         if [ "${{ github.event_name }}" == "pull_request" ] ; then
           echo "${{ github.event.number }}" > docs/sphinx-gh/prnum
         fi
-- 
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