On 22 Jun 2005, at 16:18, Vishal Vatsa wrote:
> Also most people don't want to spend like a couple of days of
> setting up the system for 10-20% boost. Its just not worth the
> compile time if don't have the latest and greatest CPU. And if you
> do then do you really care about 10% boost?
10-20% is *extremely* unlikely. It might be plausible if you were
running i386 code on a P4, but not when using funroll-loops etc
against stock -O2 on x86-64.
Also note that most of the recommended Gentoo optimisations such as
funroll-all-loops are optimising CPU usage against disk and RAM
usage. On most modern systems, where the CPU is very fast and RAM
and disk slower, this will lead to *decreased* system performance.
You also have to set the time spent compiling against potential
savings in runtime; most Gentoo packages seem to version-up every
couple of days, so there's virtually no chance that the (theoretical)
runtime gains will stack up against the time spent compiling.
Colm
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