Re: Windows buildfarm members vs. new async-notify isolation test

Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> writes:
> On Sat, Dec 7, 2019 at 5:01 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> A possible theory as to what's happening is that the kernel scheduler
>> is discriminating against listener2's signal management thread(s)
>> and not running them until everything else goes idle for a moment.

> If we have to believe that theory then why the other similar test is
> not showing the problem.

There are fewer processes involved in that case, so I don't think
it disproves the theory that this is a scheduler glitch.

> I have also debugged
> it in the Windows box that as soon as the notify sends the signal, the
> signal thread receives it and comes out of ConnectNamedPipe and does
> the processing to dispatch the signal.

Have you done that debugging on a machine that's showing the failure?
Since only some of our Windows critters are showing it, it's evidently
dependent on environment or Windows version somehow.

regards, tom lane