| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Turning off HOT/Cleanup sometimes |
| Date: | 2014-09-29 11:07:21 |
| Message-ID: | 20140929110721.GF4716@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
On 2014-09-29 11:31:11 +0200, Andres Freund wrote:
> On 2014-09-29 11:13:43 +0200, Andres Freund wrote:
> > I doubt it'll be hard to construct a case where it'll show. My first try
> > of using a pgbench scale 100, -M prepared, -cj8 with a custom file with
> > 1 write and 5 read transaction yielded the following on my laptop:
>
> Hm. On second thought that testcase probably *decreased* the bad effects
> of this because pgbench's readonly statements only touch one table...
I've attached the file nonetheless, for posterities sake.
Note it has the scale hardcoded...
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
| Attachment | Content-Type | Size |
|---|---|---|
| trans_read5_write1.sql | text/plain | 1.2 KB |
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