test: fewer splits, more workers

Author: beckermr

.github/workflows/python_package.yaml

@@ -21,7 +21,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.12"]
-        group: [1, 2, 3, 4, 5, 6, 7, 8]
+        group: [1, 2, 3, 4, 5, 6]
     env:
       NUM_SPLITS: 8
 
@@ -69,7 +69,8 @@ jobs:
             --splits ${NUM_SPLITS} --group ${{ matrix.group }} \
             --splitting-algorithm least_duration \
             --retries 1 \
-            --test-in-float32
+            --test-in-float32 \
+            -n 4
 
       - name: Test with pytest
         run: |
@@ -83,7 +84,7 @@ jobs:
             --splitting-algorithm least_duration \
             --clean-durations \
             --retries 1 \
-            -n 2
+            -n 4
 
       - name: Upload test durations
         uses: actions/upload-artifact@v7