Friday, October 04, 2019
It's a stupid benchmark about compiling a million lines of code, what else did I expect?
I came across a claim that the V programming langauge can compile 1.2 million lines of code per second.
Then I found out that the code was pretty much just 1,200,000 calls to println('hello world').
Still,
I was interested in seeing how GCC would fare. So I coded up this:
#include <stdio.h>
int main(void)
{
printf("Hello world!\n");
/* 1,199,998 more calls to printf() */
printf("Hello world!\n");
return 0;
}
which ends up being 33M, and …
[spc]lucy:/tmp>time gcc h.c gcc: Internal error: Segmentation fault (program cc1) Please submit a full bug report. See <URL:http://bugzilla.redhat.com/bugzilla> for instructions. real 14m36.527s user 0m40.282s sys 0m17.497s [spc]lucy:/tmp>
Fourteen minutes for GCC to figure out I didn't have enough memory on the 32-bit system to compile it (and the resulting core file exceeded physical memory by three times). I then tried on a 64-bit system with a bit more memory, and I fared a bit better:
[spc]saltmine:/tmp>time gcc h.c real 7m37.555s user 2m3.000s sys 1m23.353s [spc]saltmine:/tmp>
This time I got a 12M executable in 7½ minutes, which seems a bit long to me for such a simple (but large) program. I mean, Lua was able to compile an 83M script in 6 minutes, on the same 32-bit system as above, and that was considered a bug!
But I used GCC, which does some optimizations by default. Perhaps if I try no optimization?
[spc]saltmine:/tmp>time gcc -O0 h.c real 7m6.939s user 2m2.972s sys 1m27.237s [spc]saltmine:/tmp>
Wow. A whole 30 seconds faster. Way to go, GCC! Woot!
![[The future's so bright, I gotta wear shades]](https://www.conman.org/people/spc/about/2023/1023.t.jpg "The future's so bright, I gotta wear shades")