Re: KAIO ands "onstat -g iov" output

Jens Ebert wrote: > > We see the following output for onstat -g iov: > > AIO I/O vps: > class/vp s io/s totalops dskread dskwrite dskcopy wakeups io/wup > kio 0 i 4.0 225118 223795 1323 0 451246 0.5 > > kio 1 i 2.5 139912 138237 1675 0 302512 0.5 > > msc 0 i 0.0 1279 0 0 0 1128 1.1 > > aio 0 i 0.0 51 1 1 0 52 1.0 > > aio 1 i 0.0 47 1 1 0 47 1.0 > > aio 2 i 0.0 42 38 0 0 41 1.0 > > aio 3 i 0.0 1 0 0 0 1 1.0 > > aio 4 i 0.0 1 0 0 0 1 1.0 > > aio 5 i 0.0 1 0 0 0 2 0.5 > > pio 0 i 0.0 0 0 0 0 1 0.0 > > lio 0 i 0.0 0 0 0 0 1 0.0 > > There seem to be enough aio-vps, but the two kio-vps might be > overloaded. Is there a way to get more of them to tune performance or > is this the wrong way to think? That's the wrong way to think. You only need one KAIO thread per CPU. If that isn't enough, then you need more CPU's. ;-) 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. |/ ////////| +----------------------+-----------------------------------+-----------+

Strange, running 7.31 on a Compaq ds20 (True64 4.0F) I see 5 KIO on a server with 3 CPU. (but may be oyu are right, 2 KIO seems never to be used) Should I lower them 5 -> 3 and how to do that? Mark D. Stock <mdstock@mydas.freeserve.co.uk> wrote in message news:91tvdf$eg2$1@news.xmission.com... > > > > > There seem to be enough aio-vps, but the two kio-vps might be > > overloaded. Is there a way to get more of them to tune performance or > > is this the wrong way to think? > > That's the wrong way to think. You only need one KAIO thread per CPU. If > that isn't enough, then you need more CPU's. ;-) > > Cheers, > -- > Mark. >