From: | Stephen Frost <sfrost(at)snowman(dot)net> |
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To: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, Claudio Freire <klaussfreire(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: increasing the default WAL segment size |
Date: | 2016-08-26 00:37:15 |
Message-ID: | 20160826003715.GG4028@tamriel.snowman.net |
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Lists: | pgsql-hackers |
Michael,
* Michael Paquier (michael(dot)paquier(at)gmail(dot)com) wrote:
> On Thu, Aug 25, 2016 at 10:25 PM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> > On Wed, Aug 24, 2016 at 10:40:06PM -0300, Claudio Freire wrote:
> >> > time instead of requiring a recompile; we probably don't save any
> >> > significant number of cycles by compiling this into the server.
> >>
> >> FWIW, +1
> >>
> >> We're already hurt by the small segments due to a similar phenomenon
> >> as the ssh case: TCP slow start. Designing the archive/recovery
> >> command to work around TCP slow start is quite complex, and bigger
> >> segments would just be a better thing.
> >>
> >> Not to mention that bigger segments compress better.
> >
> > This would be good time to rename pg_xlog and pg_clog directories too.
>
> That would be an excellent timing to do so. The first CF is close by,
> and such a change would be better at the beginning of the development
> cycle.
If we're going to be renaming things, we might wish to consider further
changes, such as putting everything that's temporary & not WAL-logged
into "pgsql_tmp" directories, so we don't need lists of "directories to
exclude" in things like the pg_basebackup-related code.
We should really have an independent thread about this though, as it's
not what Robert's asking about here.
Thanks!
Stephen
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