| From: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Beena Emerson <memissemerson(at)gmail(dot)com> |
| Subject: | Re: increasing the default WAL segment size |
| Date: | 2017-01-04 14:47:13 |
| Message-ID: | CANP8+jL+JCF++-Lt6Zui7GAFB=TOY5_XhUzc3i-inabP_sR2rQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 4 January 2017 at 13:57, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Wed, Jan 4, 2017 at 3:05 AM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
>> Strange response. Nothing has been assumed. I asked for tests and you
>> provided measurements.
>
> Sure, of zero-filling a file with dd. But I also pointed out that in
> a real PostgreSQL cluster, the change could actually *reduce* latency.
I think we are talking at cross purposes. We agree that the main
change is useful, but it causes another problem which I can't see how
you can characterize as reduced latency, based upon your own
measurements.
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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