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Re: Inserting 8MB bytea: just 25% of disk perf used? - Mailing list pgsql-performance

From Florian Weimer
Subject Re: Inserting 8MB bytea: just 25% of disk perf used?
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Msg-id 82aawgoh09.fsf@mid.bfk.de
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In response to Inserting 8MB bytea: just 25% of disk perf used?  ("fkater@googlemail.com" <fkater@googlemail.com>)
Responses Re: Inserting 8MB bytea: just 25% of disk perf used?  ("fkater@googlemail.com" <fkater@googlemail.com>)
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> Do you have any further idea why 16MB/s seems to be the limit here?

BYTEA deserialization is very slow, and this could be a factor here.
Have you checked that you are in fact I/O bound?

You can speed things up by sending the data in binary, by passing
approriate parameters to PQexecParams().

--
Florian Weimer                <fweimer@bfk.de>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99

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