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Re: PATCH: regular logging of checkpoint progress

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Tomas Vondra <tv(at)fuzzy(dot)cz>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: PATCH: regular logging of checkpoint progress
Date: 2011-09-02 17:09:42
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Thu, Sep 1, 2011 at 3:59 PM, Tomas Vondra <tv(at)fuzzy(dot)cz> wrote:
> I've prepared a significantly simplified version of the patch. The two
> main changes are
> (a) it does not update the pg_stat_bgwriter anymore, it just prints an
> info to the server log
> (b) a new GUC is not required, it's driven by the log_checkpoints
> This version will log at least 10 'checkpoint status' lines (at 10%, 20%,
> 30%, ...) and whenever 5 seconds since the last log elapses. The time is
> not checked for each buffer but for 128 buffers.
> So if the checkpoint is very slow, you'll get a message every 5 seconds,
> if it's fast you'll get 10 messages.

This seems like a strange heuristic.  I understand the value of
emitting a progress report every N seconds, but why would you want a
report at 10%, 20%, 30% even if it hasn't been 5 seconds yet?  I don't
need ten progress messages on a checkpoint that only takes three
seconds to complete.

Robert Haas
The Enterprise PostgreSQL Company

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