Jens Olav Nygaard wrote: > Using 'ps' and looking at the 'time' field, I recognized that most > cputime on my machine is spent in X and Mozilla (of the code I have > access to source to, that is) so I want to rebuild these with gcc > 4.0.0 with some extra optimization.
I'd suggest you to not take that path! I've tried turning on additional optimizations for my firefox and thunderbird builds and found out that some combinations of optimization flags make the whole thing break, i.e. the binary segfaults or does other fancy unwanted things. For firefox I found a combination that seems to work (the speed-up is somewhat noticable) but it's too risky for me to do that with thunderbird, as I'd like me numerous emails to stay intact. (This was all with GCC 3.4.3.) GCC 4.0.0 is shiny new and is almost guaranteed to break lots of packages, especially big ones like mozilla and XFree86. You have to understand that 'newer' isn't necessarily 'better'. To my best knowledge, GCC 4.0.0 doesn't do any significant better optimizations than GCC 3.4.3 (in some cases it does even worse). It basically provides some new infrastructures to allow new future optimizations to be added. Or something like that. Actually, I'd even recommend people to only use GCC 4.0.0 for experimenting, but not for building software they want to use. I'll wait for GCC 4.1 for installing it as my main compiler. Cheers, jlh
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