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Old 08-30-2004, 12:20 AM   #1
haimeltjnfg
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Best Optimization Flags for a 512mb (ddr) equipped Athlon XP 1.8 ghz?


what are the best optimization flags?

-O3 and -fomit-pointers?

i have no idea of what any of this stuff does.
 
Old 08-30-2004, 12:30 AM   #2
Thoreau
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The O3 and additional pointers optimize the compiled from source apps with those standard flags. You can also specify cpu-athlonxp, etc. This is covered quite a bit in www.gentoo.org since that's the whole reason for the distribution. The thing is that when you optimize, you creep out a little performance from apps, but you risk their instability because most of these app programmers don't test on those flags.

My suggestion is just pick the right cpu in the kernel, enable pre-emptible kernel, and then install whatever you want. 50 bucks on a 2.6 cpu might not hurt either. If you want performance that's the better way to go with modern distro's. If you want a hobby/new job, then use gentoo and portage and the optimization flags. It's a pretty slick distribution, but the former recommendation will garner you more speed.
 
Old 08-30-2004, 12:40 AM   #3
AdamS
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I just followed with Gentoo's handbook: -O2 -march=athlon-xp -pipe -fomit-frame-pointer
And many people say -O3 can did.
but I don't want to risk^_^
 
Old 08-30-2004, 12:42 AM   #4
haimeltjnfg
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is debian considered a modern distubition?

what is the difference between -Os and -O3?
 
Old 08-30-2004, 12:52 AM   #5
Thoreau
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You smell of elderberries

Debian unstable is modern. The O3 flag is gcc optimization. Alan Cox says O2 outperforms Os, and O3 sometimes outperforms the rest. Here is one study done in that respect. It's all pretty much voodoo though. There are just too many variables/complexities involved all around.

http://jetweb.hep.ucl.ac.uk/ktjet/profiling.html
 
  


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