Re: access time performance problem - Mailing list pgsql-general

From Richard Huxton
Subject Re: access time performance problem
Date
Msg-id 200210101529.10533.dev@archonet.com
Whole thread Raw
In response to Re: access time performance problem  ("Louis-Marie Croisez" <louis-marie.croisez@etca.alcatel.be>)
List pgsql-general
On Thursday 10 Oct 2002 12:40 pm, Louis-Marie Croisez wrote:
> Hi Richard,
> I have test it right now mounting the ext3 partition with ext2.
> The result is identical.

Hmm - that's ruled the journalling out then. Logically, it can only be two
things:

1. PostgreSQL flushing buffers or similar.
2. Another process flushing buffers or similar.

Can you try it updating batches of 200 records rather than 1000 - if the time
between delays increases that would indicate it's PG doing something.
Otherwise it could be related to logging, another process or the OS.

Try tracing activity with vmstat/iostat - that should show you what's
happening in a general sense. Then we can see if we can pin it down in
detail.

--
  Richard Huxton

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