Horton

Re: [HACKERS] kqueue

Matteo Beccati <php@beccati.com>

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From: Matteo Beccati <php@beccati.com>
To: Thomas Munro <thomas.munro@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>
Cc: 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: 2020-01-21T09:55:46Z
Lists: pgsql-hackers 
Hi,

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.

If the patch gets merged, I'd say it's safer not to enable it on NetBSD
and eventually leave it up to the pkgsrc team.


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.