From: | "Marc G(dot) Fournier" <scrappy(at)postgresql(dot)org> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, pgsql-committers(at)postgresql(dot)org |
Subject: | Re: pgsql-server: Add: > > * Allow buffered WAL writes |
Date: | 2004-08-14 04:08:48 |
Message-ID: | 20040814010633.L1887@ganymede.hub.org |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-committers |
On Sat, 14 Aug 2004, Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
>> Many databases offer this feature. The submitter asked for it,
>
> Actually he didn't --- AFAICS you misinterpreted the thread completely.
> The original suggestion was that we might be able to exploit a
> transactional filesystem to improve performance *without* sacrificing
> any correctness guarantees. Delayed fsync has nothing to do with that.
>
> (I'm dubious whether there's any performance improvement to be had that
> would be worth the code uglification involved, since we're surely not
> going to *require* a transactional filesystem and so two very different
> code paths seem to be needed. But it's at least something to think about.)
Just to expand on the 'dubiousness' ... remember awhile back when I worked
through the 'no-WAL' version of PostgreSQL to test loading a database with
WAL disabled? The performance improvements on loading a database weren't
enough, I seem to recall, to warrant getting rid of WAL altogether ... so
I can't see 'delayed WAL' being faster then 'no WAL' ...
----
Marc G. Fournier Hub.Org Networking Services (http://www.hub.org)
Email: scrappy(at)hub(dot)org Yahoo!: yscrappy ICQ: 7615664
From | Date | Subject | |
---|---|---|---|
Next Message | Bruce Momjian | 2004-08-14 04:09:02 | Re: pgsql-server: Add: > > * Allow buffered WAL writes |
Previous Message | Marc G. Fournier | 2004-08-14 04:05:56 | Re: pgsql-server: Add: > > * Allow buffered WAL writes |