On Thu, Apr 21, 2016 at 3:31 PM, Alvaro Herrera
<alvhe...@2ndquadrant.com> wrote:
> Robert Haas wrote:
>> On Thu, Apr 21, 2016 at 2:22 PM, Andres Freund <and...@anarazel.de> wrote:
>> > On 2016-04-21 14:15:53 -0400, Robert Haas wrote:
>> >> On Tue, Mar 29, 2016 at 7:53 PM, Thomas Munro
>> >> <thomas.mu...@enterprisedb.com> wrote:
>> >> > On the WaitEventSet thread I posted a small patch to add kqueue
>> >> > support[1].  Since then I peeked at how some other software[2]
>> >> > interacts with kqueue and discovered that there are platforms
>> >> > including NetBSD where kevent.udata is an intptr_t instead of a void
>> >> > *.  Here's a version which should compile there.  Would any NetBSD
>> >> > user be interested in testing this?  (An alternative would be to make
>> >> > configure to test for this with some kind of AC_COMPILE_IFELSE
>> >> > incantation but the steamroller cast is simpler.)
>> >>
>> >> Did you code this up blind or do you have a NetBSD machine yourself?
>> >
>> > RMT, what do you think, should we try to get this into 9.6? It's
>> > feasible that the performance problem 98a64d0bd713c addressed is also
>> > present on free/netbsd.
>> My personal opinion is that it would be a reasonable thing to do if
>> somebody can demonstrate that it actually solves a real problem.
>> Absent that, I don't think we should rush it in.
> My first question is whether there are platforms that use kqueue on
> which the WaitEventSet stuff proves to be a bottleneck.  I vaguely
> recall that MacOS X in particular doesn't scale terribly well for other
> reasons, and I don't know if anybody runs *BSD in large machines.
> On the other hand, there's plenty of hackers running their laptops on
> MacOS X these days, so presumably any platform dependent problem would
> be discovered quickly enough.  As for NetBSD, it seems mostly a fringe
> platform, doesn't it?  We would discover serious dependency problems
> quickly enough on the buildfarm ... except that the only netbsd
> buildfarm member hasn't reported in over two weeks.
> Am I mistaken in any of these points?
> (Our coverage of the BSD platforms leaves much to be desired FWIW.)

My impression is that the Linux problem only manifested itself on
large machines.  I might be wrong about that.  But if that's true,
then we might not see regressions on other platforms just because
people aren't running those operating systems on big enough hardware.

Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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