HACK: throttle the number of cores to avoid OOM on the CI

Author: kateinoigakukun

.github/workflows/build-swift-debugging.yaml

@@ -34,7 +34,7 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: '22'
-      - run: ./tools/bootstrap.py ../../out -no-check -release-version 90001 -patch-level 0
+      - run: ./tools/bootstrap.py ../../out -verbose -no-check -release-version 90001 -patch-level 0
         working-directory: ./extensions/cxx_debugging/
       - uses: actions/upload-artifact@v4
         with:

extensions/cxx_debugging/tools/bootstrap.py

@@ -190,6 +190,10 @@ def stage2(source_dir, stage1_dir, OPTIONS):
     maybe_cmake(binary_dir, cmake_args, OPTIONS.verbose)
 
     num_cores = os.cpu_count()
+    # HACK: throttle the number of cores to avoid OOM on the CI
+    if os.getenv('CI'):
+        num_cores = min(num_cores, 1)
+
     env = os.environ.copy()
 
     if not OPTIONS.no_check: