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

From Pavan Deolasee
Subject Re: [HACKERS] Patch: Write Amplification Reduction Method (WARM)
Date
Msg-id CABOikdOpXr2=PKOtB1Xu8puC_YdoovRfC9hWSZEofxA-3=G8zg@mail.gmail.com
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In response to Re: [HACKERS] Patch: Write Amplification Reduction Method (WARM)  (Mithun Cy <mithun.cy@enterprisedb.com>)
List pgsql-hackers


On Thu, Mar 23, 2017 at 11:44 PM, Mithun Cy <mithun.cy@enterprisedb.com> wrote:
Hi Pavan,
On Thu, Mar 23, 2017 at 12:19 AM, Pavan Deolasee
<pavan.deolasee@gmail.com> wrote:
> Ok, no problem. I did some tests on AWS i2.xlarge instance (4 vCPU, 30GB
> RAM, attached SSD) and results are shown below. But I think it is important
> to get independent validation from your side too, just to ensure I am not
> making any mistake in measurement. I've attached naively put together
> scripts which I used to run the benchmark. If you find them useful, please
> adjust the paths and run on your machine.

I did a similar test appears. Your v19 looks fine to me, it does not
cause any regression, On the other hand, I also ran tests reducing
table fillfactor to 80 there I can see a small regression 2-3% in
average when updating col2 and on updating col9 again I do not see any
regression.

 
Thanks Mithun for repeating the tests and confirming that the v19 patch looks ok.

Thanks,
Pavan

--
 Pavan Deolasee                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

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