[Python-Dev] FAT Python (lack of) performance (original) (raw)
Chris Angelico rosuav at gmail.com
Tue Jan 26 10:40:08 EST 2016
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On Wed, Jan 27, 2016 at 2:28 AM, Ryan Gonzalez <rymg19 at gmail.com> wrote:
rosuav at sikorsky:~$ gcc fib.c && time ./a.out 1134903170
real 0m9.104s user 0m9.064s sys 0m0.000s rosuav at sikorsky:~$ cat fib.c #include <stdio.h> unsigned long fib(unsigned long n) { if (n < 2) return n; return fib(n-2) + fib(n-1); } int main() { printf("%lu\n",fib(45)); } cough -O3 cough
Oh, I'm sorry. Let's try it again.
rosuav at sikorsky:~$ gcc -O3 fib.c && time ./a.out 1134903170
real 0m3.153s user 0m3.088s sys 0m0.052s
Cool! Seems to be linear. From which we can deduce that Python on my system was compiled at about -O275.
ChrisA
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