Enable benchmark for existing tools

scripts/run_flake8.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env python
+"""Wrapper around Flake8 to enable multiprocessing on all operating systems.
+
+As of Python 3.8, macOS's default "start method" for multiprocessing is `spawn`. Flake8
+requires a "start method" of `fork`, and disables multiprocessing if it detects `spawn`
+or some other "start method". This script enables the `fork` start method before passing
+along any command-line arguments to `flake8`.
+
+This has never caused me any problems, but note that they disabled this for a reason:
+Flake8's plugin interface doesn't work with `spawn`, and the maintainer says that `fork`
+is "pretty broken" on macOS.
+
+See:
+
+- https://github.com/pycqa/flake8/issues/955
+- https://github.com/PyCQA/flake8/issues/1337
+- https://github.com/PyCQA/flake8/issues/342
+- https://github.com/PyCQA/flake8/pull/1621
+
+Example usage: python -m run_flake8 --select=E501 .
+"""
+import multiprocessing
+import sys
+
+from flake8.main import cli
+
+if __name__ == "__main__":
+    multiprocessing.set_start_method("fork", force=True)
+    cli.main(sys.argv[1:])