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Re: increasing the default WAL segment size

Stephen Frost <sfrost@snowman.net>

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From: Stephen Frost <sfrost@snowman.net>
To: Michael Paquier <michael.paquier@gmail.com>
Cc: Bruce Momjian <bruce@momjian.us>, Claudio Freire <klaussfreire@gmail.com>, Robert Haas <robertmhaas@gmail.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2016-08-26T00:37:15Z
Lists: pgsql-hackers 
Michael,

* Michael Paquier (michael.paquier@gmail.com) wrote:
> On Thu, Aug 25, 2016 at 10:25 PM, Bruce Momjian <bruce@momjian.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

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Make WAL segment size configurable at initdb time.

  2. Perform only one ReadControlFile() during startup.

  3. Introduce BYTES unit for GUCs.

  4. Remove useless duplicate inclusions of system header files.

  5. Refactor other replication commands to use DestRemoteSimple.

  6. Add a SHOW command to the replication command language.

  7. Add a new DestReceiver for printing tuples without catalog access.

  8. Support fls().

  9. Extend yesterday's patch making BLCKSZ and RELSEG_SIZE configurable to also

  10. Commit the reasonably uncontroversial parts of J.R. Nield's PITR patch, to

  11. XLOG (also known as WAL -:)) Bootstrap/Startup/Shutdown.

  12. Transaction log manager core code.