pg.ddx.io  pgsql-performance@postgresql.org mailing list archive  

help / color / mirror / Atom feed
From: Tom Lane <tgl@sss.pgh.pa.us>
To: Simon Riggs <simon@2ndquadrant.com>
Cc: Jignesh K. Shah <J.K.Shah@Sun.COM>
Cc: Josh Berkus <josh@agliodbs.com>
Cc: pgsql-performance@postgresql.org, "Alvaro Herrera" <alvherre@commandprompt.com>
Subject: Re: User concurrency thresholding: where do I look?
Date: Mon, 23 Jul 2007 12:35:28 -0400
Message-ID: <27521.1185208528@sss.pgh.pa.us> (raw)
In-Reply-To: <1185205663.4284.249.camel@ebony.site>
References: <200707190828.59088.josh@agliodbs.com>
	<200707191819.13899.josh@agliodbs.com>
	<15685.1184895926@sss.pgh.pa.us>
	<200707192138.39679.josh@agliodbs.com>
	<46A0FA31.2080208@sun.com>
	<12002.1184955831@sss.pgh.pa.us>
	<46A1055F.9010304@sun.com>
	<12445.1184958793@sss.pgh.pa.us>
	<46A11116.5030905@sun.com>
	<14909.1184962561@sss.pgh.pa.us>
	<46A1205B.8010205@sun.com>
	<15343.1184965054@sss.pgh.pa.us>
	<1185180668.4284.149.camel@ebony.site>
	<23848.1185199901@sss.pgh.pa.us>
	<1185201556.4284.243.camel@ebony.site>
	<25095.1185202498@sss.pgh.pa.us>
	<1185205663.4284.249.camel@ebony.site>

"Simon Riggs" <simon@2ndquadrant.com> writes:
> Well, I discover there is an allocation of 8232 (inflation...) made once
> per statement by a memory context called... ExecutorState. Still not
> sure exactly which allocation this is, but its definitely once per
> statement on pgbench, which should narrow it down. Plan, query etc?

Are you working with stock sources?  The only allocation exceeding 1K
that I can see during pgbench is BTScanOpaqueData, which is 6600 bytes.
(Checked by setting a conditional breakpoint on AllocSetAlloc.)  The
path that allocates a single-chunk block is never taken at all.

			regards, tom lane



view thread (58+ messages)  latest in thread

Message-ID: <27521.1185208528@sss.pgh.pa.us>
Permalink:  ../27521.1185208528@sss.pgh.pa.us/
Also on:    postgresql.org/message-id/27521.1185208528@sss.pgh.pa.us

 · 

reply
Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: pgsql-performance@postgresql.org
  Cc: tgl@sss.pgh.pa.us, simon@2ndquadrant.com, J.K.Shah@Sun.COM, josh@agliodbs.com, alvherre@commandprompt.com
  Subject: Re: User concurrency thresholding: where do I look?
  In-Reply-To: <27521.1185208528@sss.pgh.pa.us>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox