[Python-Dev] Add a developer mode to Python: -X dev command line option (original) (raw)

Antoine Pitrou antoine at python.org
Thu Nov 16 07:54:14 EST 2017

Hi Victor,

Thanks for the answer!

Le 16/11/2017 à 13:48, Victor Stinner a écrit :

faulthandler has a negligible cost on performance/memory. For -W default, I guess that your question is the cost on emitting a warning: overhead when a warning is displayed, and overhead when the warning is filtered. Right?

-Wdefault means -Wonce or -Walways? If the former, I don't expect many warnings to be emitted.

For example, on testos, PYTHONMALLOC=debug increases the peak memory usage from 10.5 MiB to 15.8 MiB: +50%.

I see. For my use cases, this would be acceptable :-)

But I think this should be documented, for example:

"""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."""

Regards

Antoine.

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