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Re: help with pg_dump timings

From: "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com>
To: Chris Hoover <revoohc(at)gmail(dot)com>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: help with pg_dump timings
Date: 2005-10-12 19:19:30
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
I rather doubt anyone has tested any of these timings. I've not seen
anything published, anyway. I suggest running them yourself to see
what's fastest.

I have noticed that (at least on FreeBSD), a seperate bzip2/gzip doesn't
utilize a second CPU, which is odd. But it's been a long time since I've
looked at this kind of thing.

If you do run tests, please share your findings with the community
(pgsql-general or -performance might be more appropriate than -admin).

On Wed, Oct 12, 2005 at 09:36:07AM -0400, Chris Hoover wrote:
> I'm wondering, does anyone know of any timing tests for pg_dump?
> I am trying to find the fastest way to do our nightly database backups using
> pg_dump. And I just wanted to make sure I don't reinvent the wheel if
> someone has already done a bunch of comparisions with the various ways to
> backup.
> Here are the kind of timings I'm looking at:
> pg_dump -Fc -Zx
> pg_dump -Fc
> pg_dump -Ft
> pg_dump
> pg_dump -Fc | gzip > backup
> pg_dump -Ft | gzip > backup
> pg_dump | gzip > backup
> pg_dump -Fc | bzip2 > backup
> pg_dump -Ft | bzip2 > backup
> pg_dump | bzip2 > backup
> I know there are many variables, but I'm just looking at the pg_dump
> process. Does anyone know what the fastest pg_dump would be?
> Also, what -Z compression level equals the compression of gzip? I've played
> with -Z9, but it seems to compress better than gzip (but takes a bit
> longer).
> Thanks,
> Chris

Jim C. Nasby, Sr. Engineering Consultant      jnasby(at)pervasive(dot)com
Pervasive Software    work: 512-231-6117
vcard:       cell: 512-569-9461

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