[GHC DevOps Group] CircleCI status

Greg Steuck (Sh-toy-k) gnezdo at google.com
Sat Dec 22 17:33:11 UTC 2018

FWIW, lld seems pretty well supported on Windows
<https://lld.llvm.org/windows_support.html>. We have some evidence that lld
is faster than gold and ld.bfd on Linux.


On Sat, Dec 22, 2018 at 7:44 AM Ben Gamari <ben at well-typed.com> wrote:

> "Greg Steuck (Sh-toy-k)" <gnezdo at google.com> writes:
> > I checked and we can go 10x what we have been using up to now. We'll
> have a
> > spending cap of $4500/month set up.
> >
> > If you can get away from Windows, the licensing fees will stop eating
> into
> > this budget.
> >
> Indeed. Currently Windows is eating a disproportionate amount of our
> budget due to a perfect storm of considerations:
>  a. Windows licensing fees, meaning Windows instances cost two-to-three
>     times what we pay per-core for Linux instances
>  b. the Windows linker is slow as mollasses, meaning we need lots of
>     cores to keep up with our build volume
> Build times are currently over three hours on the current four-core
> machine we current have on GCE with over half of this being spent in the
> testsuite where almost all time is spent in ld. I have made some
> inquiries to see whether there is anything we can do about this.
> In the short term I intend on increasing the size of our instance to try
> to keep up with demand a bit better.
> Thanks again for your help!
> Cheers,
> - Ben
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