[Python-Dev] Pure pickle bechmark. (original) (raw)

MRAB python at mrabarnett.plus.com
Sun Jul 9 12:12:28 EDT 2017

On 2017-07-09 15:08, Bhavishya wrote:

Hello,

1).I was going through the code of python pickle to search any optimization possibility.But the only thing that I found very alarming was again the import time(I tried with lazy-import but it didn't helped much.) I found py3 to be ~45 times slower on*initial imports(very raw measure..using "time." ) *as compared to py2 on an usual example. py3-> ./python -c ' favoritecolor = { "lion": "yellow", "kitty": "red" } pickle.dump( favoritecolor, open( "save.p", "wb" ) )' 0.009715557098388672(time taken to do initial imports...measured using time.time() ) py2-> ./python -c ' favoritecolor = { "lion": "yellow", "kitty": "red" } pickle.dump( favoritecolor, open( "save.p", "wb" ) )' 0.000236034393311(time taken to do initial imports...measured using time.time() ) Do you have any thought/ideas on improving this? Python 3 is using Unicode strings, whereas Python 2 is using bytestrings. What you show above are very short (in time) examples (less than 1/100 of a second), so they're not that meaningful.

If you had timed pickling a substantial object (the same object in both cases) and it took a significant amount of time and you found a significant slowdown, then it would be worth looking into further.

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