[Python-Dev] More optimisation ideas (original) (raw)

Serhiy Storchaka storchaka at gmail.com
Sat Jan 30 13:20:08 EST 2016

On 30.01.16 18:31, Steve Dower wrote:

On 30Jan2016 0645, Serhiy Storchaka wrote:

$ ./python -m timeit -s "import codecs; from encodings.cp437 import decodingtable" -- "codecs.charmapbuild(decodingtable)" 100000 loops, best of 3: 4.36 usec per loop

Getting rid from charmapbuild() would save you at most 4.4 microseconds per encoding. 0.0005 seconds if you have imported all standard encodings! Just as happy to be proven wrong. Perhaps I misinterpreted my original profiling and then, embarrassingly, ran with the result for a long time without retesting.

AFAIK the most time is spent in system calls like stat or open. Archiving the stdlib into the ZIP file and using zipimport can decrease Python startup time (perhaps there is an open issue about this).

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