Re: Solaris Dual Core CPU

"Claus Samuelsen" <csa@dk.ibm.com> wrote in message news:43eba117$0$46996$edfadb0f@dread15.news.tele.dk... > Colin Dawson wrote: >> We have just upgraded our servers from 16 CPU Sun 6800's to 24 CPU Sun >> 6900's; This is an O/S and hardware enhancement in which all of the new >> CPU's are dual core. Theoretically there are 32 CPU's in each server, >> even though there is only space for 24 physical CPU's. My question is, >> should I use the number of physical CPU's -1 in the onconfig file or the >> number of virtual CPU's -1 ? >> >> I'd like to use 31 - it sounds a lot better than 23 :) > > If you have 24 dual core chips in your machine - to me that corresponds to > 48 CPUs. I thought this. But Colin's a smart lad, certainly as long as the numbers stay below 50 ;-) So he had 16 single core. He added 8 dual core to give a total of 32 cores. That's what I think he meant.

>From: "Neil Truby" <neil.truby@ardenta.com> >To: informix-list@iiug.org >Subject: Re: Solaris Dual Core CPU >Date: Thu, 9 Feb 2006 20:54:54 -0000 > >"Claus Samuelsen" <csa@dk.ibm.com> wrote in message >news:43eba117$0$46996$edfadb0f@dread15.news.tele.dk... > > Colin Dawson wrote: > >> We have just upgraded our servers from 16 CPU Sun 6800's to 24 CPU Sun > >> 6900's; This is an O/S and hardware enhancement in which all of the new > >> CPU's are dual core. Theoretically there are 32 CPU's in each server, > >> even though there is only space for 24 physical CPU's. My question is, > >> should I use the number of physical CPU's -1 in the onconfig file or >the > >> number of virtual CPU's -1 ? > >> > >> I'd like to use 31 - it sounds a lot better than 23 :) > > > > If you have 24 dual core chips in your machine - to me that corresponds >to > > 48 CPUs. > >I thought this. But Colin's a smart lad, certainly as long as the numbers >stay below 50 ;-) > >So he had 16 single core. He added 8 dual core to give a total of 32 >cores. >That's what I think he meant. Oi !! less of the 50 comments thank you :D Yes Neil, that is exactly what I meant, I have set NUMCPUVPS (7.31.FD7) to 23 and will be increase it to 31 in the next couple of weeks to see what difference (if any) there is. BTW, This is a dedicated DB server, we run a two tier client/server configuration. Looking at sar output at 5 minutes intervals for the same time period before and after the upgrade the %usr and %sys figures have more than halved. I'm now going to try and get them to agree to swapping the single core CPU's for dual core. 48 CPU's, 96Gb memory, IDS 9.40 (or 10)....... Oh yesssss :) Regards Colin There are 10 types of people in the world, those that understand binary and those that don't