I have a question on how oracle consider IBM DUAL or Sun 8 core CPUS.
ie. Consider as dual CPU's and assign two physical process to each CPU?

Chan <chandra_2000_us@yahoo.com> wrote:
> I have a question on how oracle consider IBM DUAL or Sun 8 core CPUS.
> ie. Consider as dual CPU's and assign two physical process to each CPU?

I do not remeber about Power, but UltraSparc T1 is counted by Oracle
as 0.25 per core - so you need two licenses for all 8 cores.

-- 
                                                Robert Milkowski
                                                rmilkowskiDSFDSFS@wp-sa.pl
                                                http://milek.blogspot.com

 How operating system schedules processes to run on cpu's. if the CPU
is Dual core or 8 core sun T1 processer.

Chan wrote:
>  How operating system schedules processes to run on cpu's. if the CPU
> is Dual core or 8 core sun T1 processer.
> 
It sees the cores as CPUs.

-- 
Ian Collins.

In article <1139364845.424832@drone2-svc-skyt.qsi.net.nz>, ian-
news@hotmail.com says...
> Chan wrote:
> >  How operating system schedules processes to run on cpu's. if the CPU
> > is Dual core or 8 core sun T1 processer.
> > 
> It sees the cores as CPUs.
> 
> 
Actually (I think) each core consist 4 strands (due hyperthreading model 
called coolthreads) and each strand is seen as CPU, so 8 core T1 
processor shows 32 CPU's.

> Actually (I think) each core consist 4 strands (due hyperthreading model
> called coolthreads) and each strand is seen as CPU, so 8 core T1
> processor shows 32 CPU's.

This is correct. See http://blogs.sun.com/roller/page/fintanr/20051206
for an example of prtdiag/psrinfo output (and some pictures of a T2000
in a rack).

-Mark

>From a high level, each thread is treated as a separate CPU.
There are various optimizations designed to spread loads
across the various cores before loading up each core w/ more
than 1 thread to execute, and the idle thread on each CPU is
designed to halt or stall that CPU when there's nothing to do
so that other threads on the same core can use those pipeline
cycles...

- Bart