increase concurrency

Author: Rui Wang Napieralski

buildspec-slowtests.yml

@@ -11,5 +11,5 @@ phases:
 
       # slow tests
       - start_time=`date +%s`
-      - execute-command-if-has-matching-changes "tox -e py38 -- tests/integ -m slow_test -n 10 --durations 0" "tests/integ" "tests/data" "tests/conftest.py" "tests/__init__.py" "src/*.py" "setup.py" "setup.cfg" "buildspec-slowtests.yml"
+      - execute-command-if-has-matching-changes "tox -e py38 -- tests/integ -m slow_test -n 16 --durations 0" "tests/integ" "tests/data" "tests/conftest.py" "tests/__init__.py" "src/*.py" "setup.py" "setup.cfg" "buildspec-slowtests.yml"
       - ./ci-scripts/displaytime.sh 'py38 slow tests' $start_time