Direct I/O

From: lai yoke hman <lllhman(at)hotmail(dot)com>
To: <pgsql-performance(at)postgresql(dot)org>
Subject: Direct I/O
Date: 2007-07-06 02:28:49
Message-ID: BAY126-W47B86724087E7C49F49E74A9010@phx.gbl
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Hello,
How can I know my PostgreSQL 8 is using direct I/O or buffered I/O? If using buffered I/O, how can I enable direct I/O? What is the performance difference of them?
This is urgent, Thanks.
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