Re: KAIO ands "onstat -g iov" output

Earle A Long wrote: > > RTFM .... "Performance Guide, Configuration Parameters and Environment > Variables That Affect CPU Utilization, NUMAIOVPS" :- > If your operating system supports KAIO, the CPU VPs make I/O requests > directly to the file instead of the operating-system buffers. In this case, > configure only one AIO VP, plus two additional AIO VPs for every buffered > file chunk. > > You should not be using any buffered file chinks so NUMAIOVPS=1 > If you are using any buffered / block devices then use cooked / raw ones > instaed. You can't take the manuals too literally. Their recommendations are a good starting point, then you need to tune for optimum performance on your system. As someone pointed out, the NUMAIOVPS looks optimal for the io/wup figures given. Cheers, -- Mark. +----------------------------------------------------------+-----------+ | Mark D. Stock mailto:mdstock@mydas.freeserve.co.uk |//////// /| | http://www.informix.com http://www.informixhandbook.com |///// / //| | http://www.iiug.org +-----------------------------------+//// / ///| | |This email will self-destruct in |/// / ////| | |10 sec. If you received this email |// / /////| | |in error, sorry about the mess. |/ ////////| +----------------------+-----------------------------------+-----------+