To: gnhlug-discuss@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
I'm trying to test block layer IO performance using FIO (v1.58 on rhel 5 and 6)
and I'm not able to verify that the tool is actually performing non-buffered
I/O.
In my job file I'm turning on the direct option on by setting it to 1 and
I've also tried the buffered option as well.
According to
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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