Re: [gentoo-user] How to properly change CFLAGS ?

[Stefan G. Weichinger]

Neil Bothwick schrieb:
> On Mon, 21 Aug 2006 22:51:43 +0200, Stefan G. Weichinger wrote:
>
>> Now I read about the fact that -O3 results in bigger binaries and isn't
>> at all guaranteed to give me a faster system. The bigger files result in
>> more load on IO, so this tells me that it puts the load on the
>> (relatively slow) 5400 rpm HDD I have in my laptop. OTOH I have "only"
>> 512 MB RAM in there so it seems interesting to me to go the -O2 way of
>> doing Gentoo ...
>
> I agree with Richard's response to the other other parts of your mail, but
> I'd also add that -O2 may not be the best setting for your system. -Os
> applies some of the optimisations of -O3 but also optimises for size. It
> is often the best setting for systems with slow memory and disk I/O, i.e.
> laptops.

After sending my initial posting I thought I should have mentioned the
details of that laptop, as there are older and newer, slower and faster
ones ...

I think mine is somehow middleclass these days (correct me ...):

Acer TM 634
P4-M 1.8GHz (cpu family : 15, model : 2)
512 MB RAM
30 GB 5200 rpm HDD

So it is not *that* constrained in terms of RAM and disk, I assume.

But I am also ready to go the -Os-way if you recommend/suggest it for my
system.

Thanks a lot, Stefan.




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