FreeBSD page size (was Re: The results of my PostgreSQL/filesystem performance tests)

From: Vivek Khera <khera(at)kcilink(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: FreeBSD page size (was Re: The results of my PostgreSQL/filesystem performance tests)
Date: 2003-09-03 15:48:22
Message-ID: x7u17t98l5.fsf_-_@yertle.int.kciLink.com
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>>>>> "SC" == Sean Chittenden <sean(at)chittenden(dot)org> writes:

>> I need to step in and do 2 things:
SC> Thanks for posting that. Let me know if you have any questions while
SC> doing your testing. I've found that using 16K blocks on FreeBSD
SC> results in about an 8% speedup in writes to the database, fwiw.

Just double checking: if I do this, then I need to halve the
parameters in postgresql.conf that involve buffers, specifically,
max_fsm_pages and shared_buffers. I think max_fsm_pages should be
adjusted since the number of pages in the system overall has been
halved.

Anything else that should be re-tuned for this?

My tests are still running so I don't have numbers yet.

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Vivek Khera, Ph.D. Khera Communications, Inc.
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