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From: Justin Pryzby <pryzby@telsasoft.com>
To: Tomas Vondra <tomas.vondra@enterprisedb.com>
Cc: Jacob Champion <jchampion@timescale.com>
Cc: pgsql-hackers@postgresql.org, gkokolatos@pm.me, Michael Paquier <michael@paquier.xyz>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: Peter Eisentraut <peter.eisentraut@enterprisedb.com>
Cc: Heikki Linnakangas <hlinnaka@iki.fi>
Cc: Thomas Munro <thomas.munro@gmail.com>
Cc: Dipesh Pandit <dipesh.pandit@gmail.com>
Cc: Andrey Borodin <x4mmm@yandex-team.ru>
Cc: Mark Dilger <mark.dilger@enterprisedb.com>
Subject: Re: zstd compression for pg_dump
Date: Mon, 3 Apr 2023 14:17:30 -0500
Message-ID: <ZCsmSoiBMVfrlOXm@telsasoft.com> (raw)
In-Reply-To: <f3947107-a95a-348c-263c-284ac7275ae0@enterprisedb.com>
References: <ZBKgBz+4blcKru6x@telsasoft.com>
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	<4029fe58-f661-7d8d-cbbb-b936a05531e2@enterprisedb.com>
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	<2de3bcad-6da9-9022-bce5-fc0416351d6e@enterprisedb.com>
	<ZCgzbBVKLvwpqMzT@telsasoft.com>
	<f3947107-a95a-348c-263c-284ac7275ae0@enterprisedb.com>

On Sat, Apr 01, 2023 at 10:26:01PM +0200, Tomas Vondra wrote:
> > Feel free to mess around with threads (but I'd much rather see the patch
> > progress for zstd:long).
> 
> OK, understood. The long mode patch is pretty simple. IIUC it does not
> change the format, i.e. in the worst case we could leave it for PG17
> too. Correct?

Right, libzstd only has one "format", which is the same as what's used
by the commandline tool.  zstd:long doesn't change the format of the
output: the library just uses a larger memory buffer to allow better
compression.  There's no format change for zstd:workers, either.

-- 
Justin





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  Cc: pryzby@telsasoft.com, tomas.vondra@enterprisedb.com, jchampion@timescale.com, michael@paquier.xyz, robertmhaas@gmail.com, pg@bowt.ie, peter.eisentraut@enterprisedb.com, hlinnaka@iki.fi, thomas.munro@gmail.com, dipesh.pandit@gmail.com, x4mmm@yandex-team.ru, mark.dilger@enterprisedb.com
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