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From: Nathan Bossart <nathandbossart@gmail.com>
To: Imseih (AWS), Sami <samimseih@gmail.com>
Cc: Heikki Linnakangas <hlinnaka@iki.fi>
Cc: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: pgsql-hackers@postgresql.org <pgsql-hackers@postgresql.org>
Subject: Re: Restart pg_usleep when interrupted
Date: Tue, 13 Aug 2024 10:57:24 -0500
Message-ID: <ZruCZOKzS0LGAGTb@nathan> (raw)
In-Reply-To: <90ec1618-58db-46b3-8c9b-13616ac839a7@gmail.com>
References: <AED4B8D0-3ED1-463C-BA9F-BFF4B511315E@gmail.com>
	<BB742B52-D481-4D5A-926A-4ED4A6ADA98B@gmail.com>
	<ZrowomFX5yMV9zUm@ip-10-97-1-34.eu-west-3.compute.internal>
	<ZrpnfTVK-iaIW98I@nathan>
	<e3297b5e-0b33-4f45-afcd-4b00ba0b3547@gmail.com>
	<cb18c6a7-4394-4488-ad71-0b9826c8899c@iki.fi>
	<ZrqG0tIgP2HbGRm1@nathan>
	<2b5ac681-11d5-470d-af40-89ead9a868aa@gmail.com>
	<Zrt3ReA-nB7MJn2q@nathan>
	<90ec1618-58db-46b3-8c9b-13616ac839a7@gmail.com>

On Tue, Aug 13, 2024 at 10:47:51AM -0500, Imseih (AWS), Sami wrote:
> On 8/13/24 10:09 AM, Nathan Bossart wrote:
>> On Mon, Aug 12, 2024 at 05:35:08PM -0500, Imseih (AWS), Sami wrote:
>> > > Skimming the last few messages of that thread [0], it looks like Bertrand
>> > > is exploring ways to avoid so many interrupts.  I guess the unavoidable
>> > > question is whether this work is still worthwhile given that improvement.
>> > The way the instrumentation in [0] dealt with interrupts was too complex,
>> > which is why it seemed better to handle the restart the remainder of the
>> > sleep in the sleep function
>> Can you elaborate on how it is too complex?
>> 
> [0] made vacuum_delay_point more complex as it has to
> instrument cost_delay at an interval to reduce the number
> of interrupts to the leader.

Sure, but looking at the patch [0], it adds maybe an extra 10 lines of code
to limit the reports to 1 Hz.  That doesn't strike me as too complex...

[0] https://postgr.es/m/ZnlPZZZJCRu/8fka%40ip-10-97-1-34.eu-west-3.compute.internal

-- 
nathan





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