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Re: [GCC 3.x] Performance testing for QA
- From: Daniel Jacobowitz <drow at mvista dot com>
- To: Robert Dewar <dewar at gnat dot com>
- Cc: dalej at apple dot com, Peter dot Sasi at t-systems dot co dot hu, aj at suse dot de,gcc at gcc dot gnu dot org, tjw at omnigroup dot com
- Date: Tue, 3 Sep 2002 16:30:12 -0400
- Subject: Re: [GCC 3.x] Performance testing for QA
- References: <20020903202513.4ABABF2D4B@nile.gnat.com>
On Tue, Sep 03, 2002 at 04:25:13PM -0400, Robert Dewar wrote:
> <<Since the benchmark gcc is never fed any erroneous source while running
> the benchmark, none of the error-handling stuff is ever executed. With
> profile-based optimization it's possible to move a lot of that stuff so
> it never gets paged in; that's a significant win. The same conditions
> don't apply when running gcc normally, so this is fairly artificial.
> >>
>
> Why would it be paged in if it is not executed?
If it's on the same page as something which is executed. This is one
of the major benefits of profile-driven optimization.
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer