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Re: [HACKERS] Patch: Write Amplification Reduction Method (WARM) - Mailing list pgsql-hackers

From Robert Haas
Subject Re: [HACKERS] Patch: Write Amplification Reduction Method (WARM)
Date
Msg-id CA+Tgmoa7oVYTkDEAzZz2Zw2mwz49orRWV4vYPr6EZ2MP7cioRQ@mail.gmail.com
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In response to Re: [HACKERS] Patch: Write Amplification Reduction Method (WARM)  (Alvaro Herrera <alvherre@2ndquadrant.com>)
Responses Re: [HACKERS] Patch: Write Amplification Reduction Method (WARM)  (Alvaro Herrera <alvherre@2ndquadrant.com>)
Re: [HACKERS] Patch: Write Amplification Reduction Method (WARM)  (Amit Kapila <amit.kapila16@gmail.com>)
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On Wed, Mar 8, 2017 at 2:30 PM, Alvaro Herrera <alvherre@2ndquadrant.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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