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Re: Massive performance regression from switching to gcc 4.5


On Thu, Jun 24, 2010 at 11:50:52AM -0700, Taras Glek wrote:
> Just wanted to give a heads up on what might be the biggest  
> compiler-upgrade-related performance difference we've seen at Mozilla.
>
> We switched gcc4.3 for gcc4.5 and our automated benchmarking  
> infrastructure reported  4-19% slowdown on most of our performance  
> metrics on 32 and 64bit Linux.

Could you please also try gcc4.4, so that it is clear if the slowdowns
are between 4.3 and 4.4 or 4.4 and 4.5?  Would be nice to narrow the changes
a little bit.

	Jakub


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