RE: ORION results
- From: D'Hooge Freek <Freek.DHooge@xxxxxxxxx>
- To: "Brandon.Allen@xxxxxxxxxxx" <Brandon.Allen@xxxxxxxxxxx>, "mschmitt@xxxxxxxxxxxx" <mschmitt@xxxxxxxxxxxx>, "'oracle-l@xxxxxxxxxxxxx'" <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 29 Jan 2010 17:10:40 +0100
I think block devices are buffered, so you would need to use raw devices (or
open de block devices with the O_DIRECT flag).
Freek D'Hooge
Uptime
Oracle Database Administrator
email: freek.dhooge@xxxxxxxxx
tel +32(0)3 451 23 82
http://www.uptime.be
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________________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Allen, Brandon
Sent: vrijdag 29 januari 2010 17:06
To: mschmitt@xxxxxxxxxxxx; 'oracle-l@xxxxxxxxxxxxx'
Subject: RE: ORION results
Yes, you're probably just seeing caching by Linux. You can try using raw/block
devices or direct IO (depending on your OS) to avoid the OS buffering, or you
can flush the Linux buffer cache prior to your test.
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