On 19May2022 19:50, Marco Sulla <[email protected]> wrote:
>On Wed, 18 May 2022 at 23:32, Cameron Simpson <[email protected]> wrote:
>> You're measuring different things. timeit() tries hard to measure
>> just
>> the code snippet you provide. It doesn't measure the startup cost of the
>> whole python interpreter. Try:
>>
>> time python3 your-tail-prog.py /home/marco/lorem.txt
>
>Well, I'll try it, but it's not a bit unfair to compare Python startup with C?
Yes it is. But timeit goes the other way and only measures the code.
Admittedly I'd expect a C tail to be pretty quick anyway. But... even a
small C programme often has a surprising degree of startup these days,
what with dynamicly linked libraries, locale lookups etc etc. Try:
strace tail some-empty-file.txt
and see what goes on. If you're on slow hard drives what is cached in
memory and what isn't can have a surprising effect.
Cheers,
Cameron Simpson <[email protected]>
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