Speed Comparison Perl Python & C
jcarlson at nospam.uci.edu
Mon Mar 1 22:32:55 CET 2004
> i = 1
> j = 0
> while i < 100000000:
> j = j + i
> i = i + 1
> print j
> Python 93.4
> Fortran 0.28
Not quite fair. The Python version does long-integer
(infinite-precision) math when i is greater than 65534 on a 32 bit
processor. You are really counting is the time to do 100,065,535
integer additions and 99934465 long-integer additions.
Furthermore, you allow fortran to optimize the loop, but you don't
optimize the python loop yourself, using those portions built-in that
are known to be fast.
takes half-as long as the while loop on my machine, yet does the exact
Your Fortran definition includs a message saying "use 64-bit integers here":
integer*8 :: i,j
You are comparing apples to oranges on multiple levels. Don't.
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