Date: Fri, 19 May 2000 12:01:35 +0200 From: Hans Weber <weber@mt.luth.se> To: questions@FreeBSD.org Subject: gcc_debian_linux_code_on_freebsd Message-ID: <392510FE.633E06F4@mt.luth.se>
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Dear Sirs
I have a rather odd problem with gcc. (version 2.95.1)
Code compiled on a Debian linux machine with gcc (2.95) is 20 %
faster on my freebsd machine compared to if I compile on my
freebsd machine and then run it on my freebsd machine. I have
linux compat enabled.
I would like to get at least equally fast code from gcc freebsd as I get
from
gcc on debian.
The program is a molecular dynamics program doing lots of floats.
The times are typically:
compiled and run on freebsd 36 seconds
compiled on debian and run on freebsd 30 seconds
I have tried some tricks with setenv and a variable with
lots of characters this can result in (I got this from tip from a
friend)
compiled and run on freebsd becoming 34.5 seconds
Compile is done with on both debian and freebsd.
gcc -O -o langevin langevin.c -lm
and these are the includes in my program.
# include <stdio.h>
# include <math.h>
# include <stdlib.h>
# include <limits.h>
I have just added smp and taken out i386 and i486 from build
fysik3 102> cat motd
FreeBSD 4.0-RELEASE (SMPKERNEL) #1: Tue May 9 13:24:58 CEST 2000
Welcome to FreeBSD!
Best regards
HAns Weber
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