| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Jaime Casanova <jaime(dot)casanova(at)2ndquadrant(dot)com>, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Patch: Write Amplification Reduction Method (WARM) |
| Date: | 2017-03-09 03:13:31 |
| Message-ID: | CA+Tgmoa7oVYTkDEAzZz2Zw2mwz49orRWV4vYPr6EZ2MP7cioRQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Mar 8, 2017 at 2:30 PM, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> wrote:
> Not really -- it's a bit slower actually in a synthetic case measuring
> exactly the slowed-down case. See
> https://www.postgresql.org/message-id/CAD__OugK12ZqMWWjZiM-YyuD1y8JmMy6x9YEctNiF3rPp6hy0g@mail.gmail.com
> I bet in normal cases it's unnoticeable. If WARM flies, then it's going
> to provide a larger improvement than is lost to this.
Hmm, that test case isn't all that synthetic. It's just a single
column bulk update, which isn't anything all that crazy, and 5-10%
isn't nothing.
I'm kinda surprised it made that much difference, though.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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