[LLVMdev] Recent compile time performance regressions

[Chandler Carruth]

FWIW, I think I understand the primary cause of this and why it doesn't
show up in profiles or on my system. I'm working on a fix and hope to land
it this week.


On Tue, Aug 12, 2014 at 1:22 PM, Bruno Cardoso Lopes <
bruno.cardoso at gmail.com> wrote:

> I was also able to reproduce this, I filled a PR with more info:
> http://llvm.org/bugs/show_bug.cgi?id=20641
>
> On Fri, Aug 1, 2014 at 8:11 PM, Yi Kong <kongy.dev at gmail.com> wrote:
> > Hi Chandler,
> >
> > On an x86 system, for ToT LLVM:
> >
> > With "Remove support for LLVM runtime multithreading": 23.8788
> > With patch reverted: 22.5229
> >
> > That's around 6% regression.
> >
> > Detailed JSON file is at http://paste.debian.net/113238,
> > http://paste.debian.net/113239
> >
> > -Yi
> >
> > On 1 August 2014 21:56, Chandler Carruth <chandlerc at google.com> wrote:
> >>
> >> On Fri, Aug 1, 2014 at 1:47 PM, Yi Kong <kongy.dev at gmail.com> wrote:
> >>>
> >>> However the multithreading stuff is real regression and I'm able to
> >>> reproduce same regression on my local build bots.
> >>
> >>
> >> Can you share a preprocessed input and commandline which reproduces this
> >> regression?
> > _______________________________________________
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> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
>
> --
> Bruno Cardoso Lopes
> http://www.brunocardoso.cc
>
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