Re: LISTEN / NOTIFY performance in 8.3

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Joel Stevenson <joelstevenson(at)mac(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: LISTEN / NOTIFY performance in 8.3
Date: 2008-02-23 19:35:35
Message-ID: 5576.1203795335@sss.pgh.pa.us
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Joel Stevenson <joelstevenson(at)mac(dot)com> writes:
> I have an existing app that provides a producer / consumer type of
> queue and that uses the LISTEN / NOTIFY mechanism to signal the
> consumers of new items arriving in the queue. The consumers then
> process these items and issue a notify to signal that they have been
> processed. In the past issuing these notifications happened very
> quickly, now on 8.3 I'm seeing all of them taking over 300ms and many
> of them taking 1500ms or more!

That's strange, I would not have thought that listen/notify behavior
would change at all. How are you measuring this delay exactly?
Can you put together a self-contained test case?

regards, tom lane

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