Horton

Re: [HACKERS] kqueue

Matteo Beccati <php@beccati.com>

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From: Matteo Beccati <php@beccati.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Thomas Munro <thomas.munro@gmail.com>, Peter Eisentraut <peter.eisentraut@2ndquadrant.com>, Rui DeSousa <rui@crazybean.net>, Torsten Zuehlsdorff <mailinglists@toco-domains.de>, Keith Fiske <keith@omniti.com>, Andres Freund <andres@anarazel.de>, Heikki Linnakangas <hlinnaka@iki.fi>, Marko Tiikkaja <marko@joh.to>, Alvaro Herrera <alvherre@2ndquadrant.com>, Robert Haas <robertmhaas@gmail.com>, Pg Hackers <pgsql-hackers@postgresql.org>, Noah Misch <noah@leadboat.com>
Date: 2020-01-22T16:11:44Z
Lists: pgsql-hackers 
On 22/01/2020 17:06, Tom Lane wrote:
> Matteo Beccati <php@beccati.com> writes:
>> On 21/01/2020 02:06, Thomas Munro wrote:
>>> [1] https://www.postgresql.org/message-id/CA%2BhUKGJAC4Oqao%3DqforhNey20J8CiG2R%3DoBPqvfR0vOJrFysGw%40mail.gmail.com
> 
>> I had a NetBSD 8.0 VM lying around and I gave the patch a spin on latest
>> master.
>> With the kqueue patch, a pgbench -c basically hangs the whole postgres
>> instance. Not sure if it's a kernel issue, HyperVM issue o what, but
>> when it hangs, I can't even kill -9 the postgres processes or get the VM
>> to properly shutdown. The same doesn't happen, of course, with vanilla
>> postgres.
> 
> I'm a bit confused about what you are testing --- the kqueue patch
> as per this thread, or that plus the WaitLatch refactorizations in
> the other thread you point to above?

my bad, I tested the v14 patch attached to the email.

The quoted url was just above the patch name in the email client and
somehow my brain thought I was quoting the v14 patch name.


Cheers
-- 
Matteo Beccati

Development & Consulting - http://www.beccati.com/

Commits

  1. Add kqueue(2) support to the WaitEventSet API.

  2. Add WL_EXIT_ON_PM_DEATH pseudo-event.

  3. Be conservative about alignment requirements of struct epoll_event.

  4. Make idle backends exit if the postmaster dies.