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List Archive: gentoo-performance
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To: gentoo-performance@g.o
From: Florian Philipp <f.philipp@...>
Subject: Re: Advice for CFLAGS
Date: Fri, 8 Jun 2007 11:26:54 +0200
Am Freitag 08 Juni 2007 07:35 schrieb Daniel Armyr:
> > Well, I suppose that's part of the problem. What does O3 improve?
>
> I cannot speak for the -03 from gcc specifically, but most
> optimizations tend to increase the processes within the CPU. Further,
> for them to help, the compiler tends to need to, at compile time, know
> how the code will run. As such, it does almost nothing for event-driven
> code like the entire X-windows system. Further, I would like to see the
> linux computer today which has a processing problem when it comes to X.
> The disk-access times to load binaries far overshadow anything
> processor related in all computers I have seen.
>
> My suggestion to the general user: Get raided, super-fast scsi disks and
> a mobo with low-latency memory if you want a truly fast computer.

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

Summary: Archive of the gentoo-performance mailing list.

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