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Re: [COMMITTERS] pgsql: Speed up CREATE DATABASE by deferring the fsyncs until after

From: marcin mank <marcin(dot)mank(at)gmail(dot)com>
To: Andres Freund <andres(at)anarazel(dot)de>
Cc: pgsql-hackers(at)postgresql(dot)org, Greg Stark <stark(at)mit(dot)edu>
Subject: Re: [COMMITTERS] pgsql: Speed up CREATE DATABASE by deferring the fsyncs until after
Date: 2010-02-15 11:34:44
Message-ID: b1b9fac61002150334k25a4977aj1f73e9dbcc2279a@mail.gmail.com (view raw or flat)
Thread:
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On Mon, Feb 15, 2010 at 11:02 AM, Andres Freund <andres(at)anarazel(dot)de> wrote:
> Hi Marcin,
>
> Sounds rather unlikely to me. Its likely handled at an upper layer (vfs in linux' case) and only overloaded when an optimized implementation is available.
> Which os do you see implementing that only on a part of the filesystems?
>

I have a Windows XP dev machine, which runs virtualbox, which runs
ubuntu, which mounts a windows directory through vboxfs

fsync does error out on directories inside that mount.

btw: 8.4.2 initdb won`t work there too, So this is not a regression.
The error is:
DEBUG:  creating and filling new WAL file
LOG:  could not link file "pg_xlog/xlogtemp.2367" to
"pg_xlog/000000010000000000000000" (initialization of log file 0,
segment 0): Operation not permitted
FATAL:  could not open file "pg_xlog/000000010000000000000000" (log
file 0, segment 0): No such file or directory

But I would not be that sure that eg. NFS or something like that won`t complain.

Ignoring the return code seems the right choice.

Greetings
Marcin Mańk

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