| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Peter Eisentraut <peter_e(at)gmx(dot)net>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, 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: | 2015-04-15 20:06:14 |
| Message-ID: | CA+U5nMLPzTiWAbvQR0TMzns5wwkYw5vbUOGwYifju+48jYF+qQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 15 April 2015 at 16:01, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> wrote:
> Simon Riggs wrote:
>> On 15 April 2015 at 12:39, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>
>> On 04/15/2015 05:44 PM, Alvaro Herrera wrote:
>> > Robert's proposal is "when reading a page, if dirty HOT-clean it; if not
>> > dirty, also HOT-clean it but only 5 times in each scan". This runs
>> > HOT-cleanup some number of times (as many as there are dirty), and
>> > causes at most 5 pages to become dirty.
>>
>> My understanding of Robert's proposal was "when reading a page,
>> HOT-clean it, but only do this up to 5 times on clean pages, but
>> continue to do this indefinitely when the page is already dirty.".
>
> To me, both statements look identical.
I didn't read it that way, apologies for any confusion. But that is good news.
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, RemoteDBA, Training & Services
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