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help / color / mirror / Atom feedFrom: Michael Paquier <[email protected]>
To: [email protected]
Subject: pgsql: Speed up uuid_out() by not relying on a StringInfo
Date: Thu, 22 Feb 2024 01:03:56 +0000
Message-ID: <[email protected]> (raw)
Speed up uuid_out() by not relying on a StringInfo
Since the size of the string representation of an uuid is fixed, there
is no benefit in using a StringInfo. This commit simplifies uuid_oud()
to not rely on a StringInfo, where avoiding the overhead of the string
manipulation makes the function substantially faster.
A COPY TO on a relation with one UUID attribute can show up to a 40%
speedup when the bottleneck is the COPY computation with uuid_out()
showing up at the top of the profiles (numbered measure here, Laurenz
has mentioned something closer to 20% faster runtimes), for example when
the data is fully in shared buffers or the OS cache.
Author: Laurenz Albe
Reviewed-by: Andres Freund, Michael Paquier
Description: https://postgr.es/m/[email protected]
Branch
------
master
Details
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https://git.postgresql.org/pg/commitdiff/011d60c4352c5c48c0f1a185e8a12833c22a58db
Modified Files
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src/backend/utils/adt/uuid.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
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