Subject: UPDATE: -pipe didn't boost up compile speed :-(
To: None <firstname.lastname@example.org>
From: Bang Jun-Young <email@example.com>
Date: 07/06/2002 12:12:11
Arrgh. There was a stupid mistake. I forgot to add -O2 to COPTS in
/etc/mk.conf. Sorry for the wrong results.
I did the same tests again, this time with proper COPTS. To eliminate
cache effects, I rebooted the machines between the tests.
Athlon XP 1700 Pentium 166 Pentium 166 Pentium 166
w/256MB w/64MB w/32MB w/16MB
-O2 (default) 6:15 1:12:18 1:13:13 6:34:40
-pipe -O2 6:04 1:12:55 1:13:32 manually
Improvement 3% -1% -0% -100%???
Now, it is clear that -pipe doesn't boost up kernel compile on a
slow machine. You can benefit from it with a fast machine with enough
A better method to speed up build is to simply not use any optimization
options like -O2.
Bang Jun-Young <firstname.lastname@example.org>