From: Michael Paquier <michael@paquier.xyz>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: Use streaming read for VACUUM cleanup of GIN
Date: Thu, 12 Mar 2026 02:48:57 +0000
Message-ID: <E1w0W6b-003YRp-25@gemulon.postgresql.org> (raw)
Use streaming read for VACUUM cleanup of GIN
This commit replace the synchronous ReadBufferExtended() loop done in
ginvacuumcleanup() with the streaming read equivalent, to improve I/O
efficiency during GIN index vacuum cleanup operations.
With dm_delay to emulate some latency and debug_io_direct=data to force
synchronous writes and force the read path to be exercised, the author
has noticed a 5x improvement in runtime, with a substantial reduction in
IO stats numbers. I have reproduced similar numbers while running
similar tests, with improvements becoming better with more tuples and
more pages manipulated.
Author: Xuneng Zhou <xunengzhou@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Nazir Bilal Yavuz <byavuz81@gmail.com>
Discussion: https://postgr.es/m/CABPTF7VrqfbcDXqGrdLQ2xaQ=K0RzExNuw6U_GGqzSJu32wfdQ@mail.gmail.com
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/6c228755add8f0714677440d53a160f9ed332902
Modified Files
--------------
src/backend/access/gin/ginvacuum.c | 28 ++++++++++++++++++++++++++--
1 file changed, 26 insertions(+), 2 deletions(-)
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To: pgsql-committers@postgresql.org
Cc: michael@paquier.xyz, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: Use streaming read for VACUUM cleanup of GIN
In-Reply-To: <E1w0W6b-003YRp-25@gemulon.postgresql.org>
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