From: Andres Freund <andres@anarazel.de>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Greg Stark <gsstark@mit.edu>
Cc: pgsql-hackers@postgresql.org, pgsql-performance@postgresql.org, Michael Clemmons <glassresistor@gmail.com>
Cc: Hannu Krosing <hannu@2ndquadrant.com>
Cc: Scott Marlowe <scott.marlowe@gmail.com>
Subject: Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)
Date: Tue, 2 Feb 2010 19:34:07 +0100
Message-ID: <201002021934.18444.andres@anarazel.de> (raw)
In-Reply-To: <603c8f071002021014h4b489f44s9014377e1b38dbc7@mail.gmail.com>
References: <4427a97a0912101235x3ade510blcc00d5ce9883c6b6@mail.gmail.com>
<23321.1265133015@sss.pgh.pa.us>
<603c8f071002021014h4b489f44s9014377e1b38dbc7@mail.gmail.com>
On Tuesday 02 February 2010 19:14:40 Robert Haas wrote:
> On Tue, Feb 2, 2010 at 12:50 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> > Andres Freund <andres@anarazel.de> writes:
> >> On Tuesday 02 February 2010 18:36:12 Robert Haas wrote:
> >>> I took a look at this patch today and I agree with Tom that
> >>> pg_fsync_start() is a very confusing name. I don't know what the
> >>> right name is, but this doesn't fsync so I don't think it shuld have
> >>> fsync in the name. Maybe something like pg_advise_abandon() or
> >>> pg_abandon_cache(). The current name is really wishful thinking:
> >>> you're hoping that it will make the kernel start the fsync, but it
> >>> might not. I think pg_start_data_flush() is similarly optimistic.
> >>
> >> What about: pg_fsync_prepare().
> >
> > prepare_for_fsync()?
>
> It still seems mis-descriptive to me. Couldn't the same routine be
> used simply to abandon undirtied data that we no longer care about
> caching?
For now it could - but it very well might be converted to sync_file_range or
similar, which would have different "sideeffects".
As the potential code duplication is rather small I would prefer to describe
the prime effect not the sideeffects...
Andres
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To: pgsql-performance@postgresql.org
Cc: andres@anarazel.de, robertmhaas@gmail.com, tgl@sss.pgh.pa.us, gsstark@mit.edu, glassresistor@gmail.com, hannu@2ndquadrant.com, scott.marlowe@gmail.com
Subject: Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)
In-Reply-To: <201002021934.18444.andres@anarazel.de>
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