Irreversible performance drop after increasing shared mem - Mailing list pgsql-general

From jake@omnimode.com (jake johnson)
Subject Irreversible performance drop after increasing shared mem
Date
Msg-id 8897a0de.0402241040.1db32e2c@posting.google.com
Whole thread Raw
Responses Re: Irreversible performance drop after increasing shared mem  (Martijn van Oosterhout <kleptog@svana.org>)
List pgsql-general
I'm running PG 7.4.1 on FreeBSD 5.2.1_RC1 and experienced a general
40% drop in performance after increasing Shared mem buffers to 2000
(from the 1000 default setting) and the Sort Mem to 1024 from 16.
After changing the .conf file back to the original values, performance
didn't change back.  Only after dropping the database and reloading
from dump, did performance return.  Is this unusual behavior in
anyone's opinion?  (Note that I didn't forget to do a pg_ctl reload to
have postmaster re-read the .conf file.)

pgsql-general by date:

Previous
From: "Greg Patnude"
Date:
Subject: Re: Moving from MySQL to PGSQL....some questions
Next
From: jack_turer@yahoo.com (jack turer)
Date:
Subject: Re: pg_dump and pg_dumpall fail when trying to backup database