That's a big help. I'm not certain Jeff reads julia-users, however, so you
might want to file an issue.
Best,
--Tim
On Wednesday, March 23, 2016 04:34:25 PM 'Bill Hart' via julia-users wrote:
> On Thursday, 24 March 2016 00:33:04 UTC+1, Bill Hart wrote:
> > It seems there may have been two regressions. The first regression with a
> > slowdown factor of just over 2 seems to be:
> >
> > 639621859863609c5f3abbc2ed75c675695b3693 is the first bad commit
> > commit 639621859863609c5f3abbc2ed75c675695b3693
> > Author: Jeff Bezanson <jeff.b{xxxxxx}@gmail.com>
> > Date: Tue Jan 26 23:33:19 2016 -0500
> >
> > modify Base.Test not to create a closure for each test
> > :
> > :040000 040000 9c84c85afaed99190f3e744123dccc732f2c760e
> >
> > 486795536d95d1fb14fd9f7f415fb63cd9c6e490 M base
> >
> > :040000 040000 48205a7b1b007692c81b1a8d931cb44f6cc97be8
> >
> > acb43cd0ecece4237e1834b7a3b577f312884650 M test
> >
> > I will try to find time to find the second regression, which occurs
> > between 1bfabbb and 1bfabbb I believe.
>
> Sorry, that should say between 1bfabbb and 9d6e726.
>
> Bill.
>
> > On Wednesday, 23 March 2016 15:23:05 UTC+1, Bill Hart wrote:
> >> I'll see if it is possible. Currently our code does not work at all with
> >> large chunks of the Julia commits in that interval. We had to work around
> >> various things and don't know precisely when they were switched on or
> >> off.
> >>
> >> Bill.
> >>
> >> On Wednesday, 23 March 2016 14:54:22 UTC+1, Tim Holy wrote:
> >>> If you can git-bisect the change, it would be a huge help.
> >>>
> >>> Best,
> >>> --Tim
> >>>
> >>> On Wednesday, March 23, 2016 06:18:23 AM 'Bill Hart' via julia-users
> >>>
> >>> wrote:
> >>> > In very recent Julia-0.5-dev the test code in our Nemo module takes
> >>>
> >>> forever
> >>>
> >>> > to start running. It's close to 2 minutes.
> >>> >
> >>> > This compares with about 15s with older Julia-0.5-dev, say 3 months
> >>>
> >>> ago
> >>>
> >>> > before the LLVM switchover.
> >>> >
> >>> > Does anyone know why there is this massive performance regression. Is
> >>>
> >>> it
> >>>
> >>> > likely that it can be fixed? It's really killing our development
> >>>
> >>> cycle.
> >>>
> >>> > Bill.
