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Re: PATCH: regular logging of checkpoint progress

From: "Tomas Vondra" <tv(at)fuzzy(dot)cz>
To: "Tomas Vondra" <tv(at)fuzzy(dot)cz>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: PATCH: regular logging of checkpoint progress
Date: 2011-09-01 19:59:56
Message-ID: 14933e7d24533b829c198e0d8c7b5ad3.squirrel@sq.gransy.com (view raw or flat)
Thread:
Lists: pgsql-hackers
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.

Tomas

Attachment: checkpoint-stats-update-v2.diff
Description: text/plain (3.4 KB)

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