Re: Redhat linux and async io

wagen123_at_yahoo.com wrote:
> Hi,
>
> Oracle10g 10.2.0.1 (32 bit)
> RHEL 4 update 3 (32 bit)
>
> * I have installed the async io rpm's
> $ rpm -qa | grep aio
> libaio-0.3.102-1
> libaio-devel-0.3.102-1
>
> Questions:
> 1) How do i verify/check if the async io is enabled/loaded in RHEL
> kernel?
> I solaris I used to
> $ modinfo | grep kaio
> 142 1344ccb 4916 178 1 kaio (kernel Async I/O)
> 142 1344ccb 4916 178 1 kaio (kernel Async I/O for 32 bit com)
>
> One of the Metalink docs says check
> $ cat /proc/slabinfo | grep kio
>

Hi Wagen,
you should look into slabinfo as the metalink document suggests.

This system doesn't use asynch I/O:

# grep kio /proc/slabinfo

kioctx                 0      0    256   15    1 : tunables  120   60 
  8 : slabdata      0      0      0
kiocb                  0      0    128   30    1 : tunables  120   60 
  8 : slabdata      0      0      0

while this does:

# grep kio /proc/slabinfo

kioctx                64     90    256   15    1 : tunables  120   60 
  8 : slabdata      6      6      0
kiocb                  0      0    128   30    1 : tunables  120   60 
  8 : slabdata      0      0      0

(zeros in the first columns indicates the feature is not being used).

Oracle 10gR2 has asynch I/O enabled by default (even on filesystem).

 > 2) How do I determine if the redlat linux installed is 32 or 64 bit
 > version?
 > Is getconf LONG_BIT the only way to determine this or will uname -a
 > show something specific.

As already suggested uname is the solution.

Regards

-- 
Fabrizio Magni

fabrizio.magni_at_mycontinent.com

replace mycontinent with europe