Re: multi-worker pg_restore was: 8.3 / 8.2.6 restore comparison

From: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Jeff Davis <pgsql(at)j-davis(dot)com>, Heikki Linnakangas <heikki(at)enterprisedb(dot)com>, Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>, Luke Lonergan <llonergan(at)greenplum(dot)com>, Greg Smith <gsmith(at)gregsmith(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: multi-worker pg_restore was: 8.3 / 8.2.6 restore comparison
Date: 2008-02-27 00:24:01
Message-ID: 20080226162401.1a6f70a1@commandprompt.com
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On Tue, 26 Feb 2008 19:03:57 -0500
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> So you have four serialization points not just one; at each one the
> slowest subtask forces everyone else to wait, even if there's work
> that could potentially be done on other tables. This is fine for a
> quick-and-dirty proof of concept but it's certainly not how we'd want
> to implement the real thing. But I doubt you can get much further
> without putting some actual dependency awareness into it.

Exactly. I have gone as far as I actually can without quite a bit of
brain trauma and hand holding. I could probably prototype it in perl
fairly easy but C is a complete no go for me.

I hope the numbers were at least helpful.

Sincerely,

Joshua D. Drake

>
> regards, tom lane
>
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