Why Python Is Slow: Looking Under the Hood

Re:Why Python Is Slow: Looking Under the Hood by csirac2 on Wednesday November 19, 2014 @06:09PM (#8633295)

I'm always wary of these kinds of sub-second benchmarks because more often than not you've only accidentally measured just the compilation and startup times.

I might have some bias though from speeding up a crusty old Perl CGI web apps with multi-second request times down to less than 100ms simply by keeping the perl processes persistent with mod_fcgid or whatever.

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Re:Why Python Is Slow: Looking Under the Hood by haberman on Thursday November 20, 2014 @02:34AM (#8634717)

> I'm always wary of these kinds of sub-second benchmarks because more often than not you've only accidentally measured just the compilation and startup times.

I increased the iteration count by 10x and observed exactly the same pattern:

    $ time perl -ne 'print if /number 12345/' < file
    [...]
    real    0m1.661s
    user    0m1.586s
    sys     0m0.076s
    $ time grep "number 12345" file
    [...]
    real    0m0.188s
    user    0m0.132s
    sys     0m0.056s

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Re:Why Python Is Slow: Looking Under the Hood by csirac2 on Thursday November 20, 2014 @05:07AM (#8635051)

Cool, thanks for entertaining my superstitions :)

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