Re: Layout talos regressions in Visual Studio 2015

On Tuesday, March 15, 2016 at 8:30:01 AM UTC+6, Gregory Szorc wrote:
> According to https://bugzilla.mozilla.org/show_bug.cgi?id=1254767#c2 a
> number of apparently layout related Talos figures regressed on PGO builds
> performed with Visual Studio 2015. This is concerning and represents a
> potential showstopper for switching automation to VS2015 this release cycle.
> 
> I'm sending this email to ask for help from layout technical experts to
> help identify reasons for the regressions. Links to builds you can
> test/profile with are in the bug.
> 
> I'm reasonably confident that the PGO profiling and optimization process
> completed successfully. But don't rule out a failure there that's causing
> layout code to not get PGO benefits.
> 
> Can someone please help us understand where layout code is slower with
> these builds so we can switch to VS2015 in the next week or two?
> 
> gps