RE: Re: libaio on RHEL4

Hi Charlotte,

aio/0 and aio/1 are kernel threads that actually do the kernelized AIO under linux. However, for a user space program to access the AIO interface, libaio is required. So, aio/0 and aio/1 are the parts of the kernel that support AIO, and indicate that you're running an AIO-capable kernel. But, for any program, such as Oracle, to actually utilize AIO, requires libaio be installed, to provide the user space to kernel interface.

Hope that helps,

-Mark

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-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Charlotte Hammond
Sent: Thursday, March 16, 2006 10:23 AM
To: oracle-l_at_freelists.org
Subject: Fwd: Re: libaio on RHEL4


Hi Johan,
 
Thanks for the quick reponse.  No: the RPM query does not return any
rows....  
 
Perhaps my question would be better stated as this:
  
What are the [aio/0], [aio/1], etc. processes I can see with ps, given
that libaio is not installed.
 
Thanks
Charlotte
 


> --- johan Eriksson <johan.eriksson_at_bossmedia.se>

> wrote:
> 
> > Hi
> > 
> > libaio is installed in /usr/lib.
> > run "rpm -qa|grep libaio", if you get any rows
> back
> > you have it
> > installed, otherwise install it (with yum or other program).
> > 
> > If you install a 64-bit system I think you have to install both 32 
> > and
> > 64 bit version of libaio (including devel package)
> > 
> > /Johan


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