Horton

Re: [HACKERS] kqueue

Thomas Munro <thomas.munro@enterprisedb.com>

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From: Thomas Munro <thomas.munro@enterprisedb.com>
To: Torsten Zuehlsdorff <mailinglists@toco-domains.de>
Cc: Keith Fiske <keith@omniti.com>, Matteo Beccati <php@beccati.com>, Tom Lane <tgl@sss.pgh.pa.us>, 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>, Mateusz Guzik <mjguzik@gmail.com>
Date: 2018-05-21T07:03:57Z
Lists: pgsql-hackers 
On Wed, Apr 11, 2018 at 1:05 PM, Thomas Munro
<thomas.munro@enterprisedb.com> wrote:
> I heard through the grapevine of some people currently investigating
> performance problems on busy FreeBSD systems, possibly related to the
> postmaster pipe.  I suspect this patch might be a part of the solution
> (other patches probably needed to get maximum value out of this patch:
> reuse WaitEventSet objects in some key places, and get rid of high
> frequency PostmasterIsAlive() read() calls).  The autoconf-fu in the
> last version bit-rotted so it seemed like a good time to post a
> rebased patch.

Once I knew how to get a message resent to someone who wasn't
subscribed to our mailing list at the time it was sent[1] so they
could join an existing thread.  I don't know how to do that with the
new mailing list software, so I'm CC'ing Mateusz so he can share his
results on-thread.  Sorry for the noise.

[1] https://www.postgresql.org/message-id/CAEepm=0-KsV4Sj-0Qd4rMCg7UYdOQA=TUjLkEZOX7h_qiQQaCA@mail.gmail.com

-- 
Thomas Munro
http://www.enterprisedb.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.