Athena P wrote these words on 02/10/07 13:18 CST: > Surely specifying the CPU architecture is still worth while. For example > using this string must give speed improvements. > > "-O3 -march=prescott -march=prescott -mtune=prescott -mmmx -msse - > msse2 -msse3 -m3dnow -pipe -mfpmath=sse" -fomit-fram-pointer" > > Or am I missing something?
[Please don't top-post your replies] I've never done optimizing, so I cannot fairly comment. I trust the developers, and use their defaults. How much "speed" to you expect to gain in percent? Let's say you get 5% (seems *extremely* high to me that you could achieve that much). So a process takes 5 minutes (300 seconds), you would save 15 seconds. Substantial. But then 3 packages down the road, you have subtle build issues, or strange problems running some application, is the 5% worth it? If the answer is "yes" for you, then drive on. To me, it is a risk not worth taking on my production systems. -- Randy rmlscsi: [bogomips 1003.26] [GNU ld version 2.16.1] [gcc (GCC) 4.0.3] [GNU C Library stable release version 2.3.6] [Linux 2.6.14.3 i686] 13:23:00 up 31 days, 13:37, 1 user, load average: 0.43, 0.27, 0.20 -- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
