Testing direct IO with FIO

Rodney Tortorich rtorti19 at yahoo.com
Tue Jan 24 13:27:19 EST 2012


I think I figured out my problem.
I wasn't following all the forked processes in my strace correctly.

Using the -ff option I now see the file being opened with the O_DIRECT flag as I expected.

-Rodney



________________________________
 From: Michael ODonnell <michael.odonnell at comcast.net>
To: gnhlug-discuss at mail.gnhlug.org 
Sent: Monday, January 23, 2012 9:52 PM
Subject: Re: Testing direct IO with FIO
 


Does your strace output show any fcntl() calls?  I believe it's
possible (maybe even necessary?) to set attributes like O_DIRECT
and O_ASYNC using fcntl() as well as during the original open().

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