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List Archive: gentoo-performance
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To: gentoo-performance@g.o
From: Ravi Pinjala <ravi@...>
Subject: Re: Advice for CFLAGS
Date: Fri, 08 Jun 2007 11:13:20 -0500
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Mike Spitzer wrote:
> On Fri, Jun 08, 2007 at 11:26:54AM +0200, Florian Philipp wrote:
>> In other words, there is no clear answer but my chances are quiet bad.
>>
>> I think I'll try around a bit. I'll prepare three images on my desktop, one 
>> Os, one O2 and one O3.
>>
>> Then I'll post my experience...
> 
> Just from personal experience: I once compiled everything using O3 and
> couldn't tell any appreciable difference in speed on most applications.
> It also seemed to cause some applications to behave oddly or crash at
> weird times. Booting off of a boot cd and recompiling the whole system
> with O2 fixed all of the problems.
> 
> That was with a PIII, though. I understand many apps now that have
> trouble with O3 are force to O2 with their ebuild, so your experience
> may end up being a lot different. It hasn't been worth it for me to try
> it again.

I don't think it's just P3; I've heard of -O3 causing instability,
crashes, or whatnot on other archs too. The best thing is probably to
use -O2 in general, and use higher optimizations for specific
applications that you want to tune.

- --Ravi
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gentoo-performance@g.o mailing list


References:
Advice for CFLAGS
-- Florian Philipp
Re: Advice for CFLAGS
-- Florian Philipp
Re: Advice for CFLAGS
-- Daniel Armyr
Re: Advice for CFLAGS
-- Florian Philipp
Re: Advice for CFLAGS
-- Mike Spitzer
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Updated Jun 17, 2009

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