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On 16 November 2017 at 22:54, Antoine Pitrou <antoine@python.org> wrote:

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.

Confusingly, neither of these: default, once, module, and always are all different settings.

once: once per process (regardless of location)

module: once per module (regardless of line)

default: once per location (line+module combination)

always: every time

Still, even with once-per-location behaviour, the warning overhead should be minimal.

Cheers,

Nick.

Nick Coghlan | ncoghlan@gmail.com | Brisbane, Australia