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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Dimitrios Apostolou <jimis@gmx.net>
Cc: Chao Li <li.evan.chao@gmail.com>
Cc: Nathan Bossart <nathandbossart@gmail.com>
Cc: Thomas Munro <thomas.munro@gmail.com>
Cc: pgsql-hackers@lists.postgresql.org
Subject: Re: [PING] [PATCH v2] parallel pg_restore: avoid disk seeks when jumping short distance forward
Date: Thu, 16 Oct 2025 13:01:10 -0400
Message-ID: <1518975.1760634070@sss.pgh.pa.us> (raw)
In-Reply-To: <1306492.1760556110@sss.pgh.pa.us>
References: <2edb7a57-b225-3b23-a680-62ba90658fec@gmx.net>
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	<1282067.1744651649@sss.pgh.pa.us>
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	<f7a23708-c336-c189-f155-4b3197bf6ea0@gmx.net>
	<aEioDuePEBRnfJYk@nathan>
	<5ed51587-5a24-4d79-e36e-927620d0e3a2@gmx.net>
	<aEygf8AchBk04gOA@nathan>
	<f99e9774-da49-60f0-20e0-b97d9f12a04e@gmx.net>
	<72d2c81b-a0fe-3d99-9dd4-0d771e6e673e@gmx.net>
	<1po8os49-r63o-2923-p37n-12698o1qn7p0@tzk.arg>
	<3515357.1760128017@sss.pgh.pa.us>
	<3698234.1760149336@sss.pgh.pa.us>
	<3686.1760232320@sss.pgh.pa.us>
	<CBF70398-279C-4BA7-9FA1-2879A49F4EC9@gmail.com>
	<717335.1760389672@sss.pgh.pa.us>
	<1306492.1760556110@sss.pgh.pa.us>

I wrote:
> I think this is more or less committable, and then we could get
> back to the original question of whether it's worth tweaking
> pg_restore's seek-vs-scan behavior.

And done.  Dimitrios, could you re-do your testing against current
HEAD, and see if there's still a benefit to tweaking pg_restore's
seek-vs-read decisions, and if so what's the best number?

			regards, tom lane





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