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Re: [PATCH] profile feedback: -fprofile-use= and -fprofile-correction, correctness fixes and option semantic changes.


Hi,

On Thu, 27 Mar 2008, Jan Hubicka wrote:

> > missed counter updates in multithreaded profile collection.
> > Using atomic updates for counter increment adds significant overhead,
> > especially as the core count grows.
> 
> I will need to play with this more tomorrow.  I would like to have the
> atomic operation being the default solution for coverage (I tought
> Zdenek had a patch for this, but it is not in mainline, I will need to
> dig out the history here).

It was me.  I need to submit it again for trunk.  IIRC it did slow down 
the profiled runs somewhat, but not extremely.


Ciao,
Michael.


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