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Re: 40% performance regression SPEC2006/leslie3d on gcc-4_2-branch
On Mon, Feb 19, 2007 at 03:16:12PM -0800, Mark Mitchell wrote:
> Daniel Berlin wrote:
>
> >> > > > It looks like your changeset listed bellow makes performance
> >> > > > regression ~40% on SPEC2006/leslie3d. I will try to create minimal
> >> > > > test for this issue this week and update you in any case.
>
> >> > The price of fixing them in 4.2 was a serious performance drop.
> >>
> >> There's the option of un-fixing them to get back to the state of 4.1
> >> declaring
> >> them fixed in 4.3 earliest.
>
> I would like to understand a few things:
>
> 1. What is the overall drop in SPEC scores as a result of this patch? I
> understand the impact on leslie3d, but what is the overall impact?
> Hopefully, this is an easy question to answer: run SPEC, revert the
> patch, run SPEC again.
>
We are working on complete data of SPEC CPU 2K/2006 on Core 2 Duo.
It will take about a week. Our earlier, mid Jan., SPEC CPU 2006 shows:
FP performance regressions of the recent GCC 4.2 (revision 120817)
compiler against September GCC 4.2 (revision 116799)
410.bwaves -6.3%
433.milc -7.0%
437.leslie3d -25.4%
450.soplex -3.9%
459.GemsFDTD -18.3%
465.tonto -2.5%
470.lbm -4.1%
481.wrf -2.7%
H.J.