[Python-Dev] Tunable parameters in dictobject.c (was dictnotes.txt out of date?) (original) (raw)

"Martin v. Löwis" martin at v.loewis.de
Mon Jun 18 23:55:54 CEST 2012

On 18.06.2012 23:08, Steven D'Aprano wrote:

Raymond Hettinger wrote:

Sorry I can make a more detailed post right now. I'll make time in the next couple of weeks to post some code and timings that document the collision counts, total memory size, and its affect on various dict use cases. Is there some way to instrument dictionary sparseness, number of hits and misses, etc. from Python? A secret command-line switch, perhaps, or a compile-time option?

Not that I know of, no.

And if there isn't, perhaps there should be.

If so, only compile time options could be acceptable. However, in my experience with profiling, the specific statistics that you want to obtain are rarely known in advance, so you have to write specific instrumentation every time you want to do an experiment - and then the instrumentation is only good for that single experiment.

Thus, nobody publishes the instrumentation, since it would accumulate as clutter.

Regards, Martin

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