Hi team, this is a question on how Pants run tests in parallel. I have multiple shards of unit tests and I run the command like this "`./pants -ldebug test test_dags_shard_1, test_dags_shard_2, ...`". What I see from the log is:

22:36:33.91 [DEBUG] Running Run Pytest for airflow2/test/python/data_dag_tests/dag_tests/test_dags_shard_6.py:tests under semaphore with concurrency id: 8, and concurrency: 1

22:36:33.91 [DEBUG] Starting: Run Pytest for airflow2/test/python/data_dag_tests/dag_tests/test_dags_shard_6.py:tests

22:36:33.91 [DEBUG] Starting: setup_sandbox

The message "`concurrency: 1`" makes me think there is actually no concurrency. Am I correct? Thanks!

by default, pants will run multiple test files in parallel, but it will not run multiple test methods in parallel

Thanks Stu!

That'd make a cool Pants tip of the Day. How's this?

Tip of the Day:

Pants runs multiple test files in parallel by default. Want to run multiple test methods in parallel? Sure, no problem! https://www.pantsbuild.org/docs/reference-pytest#xdist_enabled (just remember to first make your test methods concurrency-safe...)

Yea it is really cool!