From: | Michael Paquier <michael(at)paquier(dot)xyz> |
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To: | pgsql-committers(at)lists(dot)postgresql(dot)org |
Subject: | pgsql: Speed up uuid_out() by not relying on a StringInfo |
Date: | 2024-02-22 01:03:56 |
Message-ID: | E1rcxVE-0003eI-1V@gemulon.postgresql.org |
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Lists: | pgsql-committers |
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/679d5455cbbb0af667ccb753da51a475bae1eaed.camel@cybertec.at
Branch
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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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