From: | Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> |
---|---|
To: | PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
Subject: | performance regression when filling in a table |
Date: | 2019-04-30 05:12:03 |
Message-ID: | alpine.DEB.2.21.1904300653150.29712@lancre |
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Lists: | pgsql-hackers |
Hello devs,
On my SSD Ubuntu laptop, with postgres-distributed binaries and unmodified
default settings using local connections:
## pg 11.2
> time pgbench -i -s 100
...
done in 31.51 s
# (drop tables 0.00 s, create tables 0.01 s, generate 21.30 s, vacuum 3.32 s, primary keys 6.88 s).
# real 0m31.524s
## pg 12devel (cd3e2746)
> time pgbench -i -s 100
# done in 38.68 s
# (drop tables 0.00 s, create tables 0.02 s, generate 29.70 s, vacuum 2.92 s, primary keys 6.04 s).
real 0m38.695s
That is an overall +20% regression, and about 40% on the generate phase
alone. This is not a fluke, repeating the procedure shows similar results.
Is it the same for other people out there, or is it only something related
to my setup?
What change could explain such a significant performance regression?
--
Fabien.
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