Issue 32043: Add a new -X dev option: "developer mode" (original) (raw)

This issue has been migrated to GitHub: https://github.com/python/cpython/issues/76224

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process

Created on 2017-11-16 02:43 by vstinner, last changed 2022-04-11 14:58 by admin. This issue is now closed.

Messages (7)
msg306330 - (view)	Author: STINNER Victor (vstinner) *	Date: 2017-11-16 02:43
I propose to add a new "developer mode": a new "-X dev" command line option. In short: python3 -X dev script.py behaves as: PYTHONMALLOC=debug python3 -W default -X faulthandler script.py For the rationale, please see: https://mail.python.org/pipermail/python-dev/2017-November/150514.html
msg306331 - (view)	Author: STINNER Victor (vstinner) *	Date: 2017-11-16 02:48
I rewrote Py_Main() in bpo-32030 to make it very easy to implement this new feature. I wrote PR 4413 to implement -X dev.
msg306351 - (view)	Author: STINNER Victor (vstinner) *	Date: 2017-11-16 11:20
New changeset ccb0442a338066bf40fe417455e5a374e5238afb by Victor Stinner in branch 'master': bpo-32043: New "developer mode": "-X dev" option (#4413) https://github.com/python/cpython/commit/ccb0442a338066bf40fe417455e5a374e5238afb
msg306357 - (view)	Author: STINNER Victor (vstinner) *	Date: 2017-11-16 13:04
Antoine Pitrou asked me to document the performance and memory overhead of -X dev: https://mail.python.org/pipermail/python-dev/2017-November/150578.html For example, I measured an increase of +50% on the peak memory usage (measured by tracemalloc) when running test_os. Antoine proposed: """Currently, developer mode adds negligible CPU time overhead, but can increase memory consumption significantly if many small objects are allocated. This is subject to change in the future.""" https://mail.python.org/pipermail/python-dev/2017-November/150579.html
msg306619 - (view)	Author: STINNER Victor (vstinner) *	Date: 2017-11-21 02:59
I created bpo-32101: Add PYTHONDEVMODE=1 to enable the developer mode.
msg306620 - (view)	Author: STINNER Victor (vstinner) *	Date: 2017-11-21 02:59
New changeset bc9b6e29cb52f8da15613f9174af2f603131b56d by Victor Stinner in branch 'master': bpo-32043: Rephrase -X dev documentation (#4478) https://github.com/python/cpython/commit/bc9b6e29cb52f8da15613f9174af2f603131b56d
msg306621 - (view)	Author: STINNER Victor (vstinner) *	Date: 2017-11-21 03:03
While the discussion is not done, I close this issue to focus on other more specific issues. I completed the documentation and fixed warnings filters (bpo-32089). The option now also enables asyncio debug mode (bpo-32047). It was proposed to add an environment variable to enable the developer mode: see bpo-32101 ("Add PYTHONDEVMODE=1 to enable the developer mode"). Note: I also fixed subprocess._args_from_interpreter_flags: bpo-32094.