| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Amit kapila <amit(dot)kapila(at)huawei(dot)com> |
| Cc: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, "hlinnakangas(at)vmware(dot)com" <hlinnakangas(at)vmware(dot)com>, "noah(at)leadboat(dot)com" <noah(at)leadboat(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Performance Improvement by reducing WAL for Update Operation |
| Date: | 2013-01-11 17:42:09 |
| Message-ID: | CA+U5nML6Zx6=fv5wRxFHYsfAm7YSX2TT-Oqc5wya-_hSRp89-A@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 11 January 2013 17:30, Amit kapila <amit(dot)kapila(at)huawei(dot)com> wrote:
> On Friday, January 11, 2013 7:59 PM Alvaro Herrera wrote:
> Simon Riggs wrote:
>> On 28 December 2012 10:21, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
>>
>
>> I was also worried about the high variance in the results. Those
>> averages look rather meaningless. Which would be okay, I think, because
>> it'd mean that performance-wise the patch is a wash,
>
> For larger tuple sizes (>1000 && < 1800), the performance gain will be good.
> Please refer performance results by me and Kyotaro-san in below links:
>
> http://archives.postgresql.org/message-id/6C0B27F7206C9E4CA54AE035729E9C383BEAAE32@szxeml509-mbx
> http://archives.postgresql.org/message-id/20121228.170748.90887322.horiguchi.kyotaro@lab.ntt.co.jp
AFAICS your tests are badly variable, but as Alvaro says, they aren't
accurate enough to tell there's a regression.
I'll assume not and carry on.
(BTW the rejection of the null bitmap patch because of a performance
regression may also need to be reconsidered).
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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