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>
Date: 2018-04-11T01:05:17Z
Lists: pgsql-hackers

Attachments

On Wed, Dec 6, 2017 at 12:53 AM, Thomas Munro
<thomas.munro@enterprisedb.com> wrote:
> On Thu, Jun 22, 2017 at 7:19 PM, Thomas Munro
> <thomas.munro@enterprisedb.com> wrote:
>> I don't plan to resubmit this patch myself, but I was doing some
>> spring cleaning and rebasing today and I figured it might be worth
>> quietly leaving a working patch here just in case anyone from the
>> various BSD communities is interested in taking the idea further.

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.

-- 
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.