Re: SMP questions

["Earle R. Nietzel" <nietzel@rhinobox.org>]

On Fri, 2003-06-20 at 02:45, Robert M. Hyatt wrote:
> On 19 Jun 2003, Earle R. Nietzel wrote:
> 
> > 
> > > Why would you want to?  This is something the operating system should 
> > > handle correctly.
> > Agreed that the OS should be able to handle it the best it can. 
> > 
> > Though somtimes you have processes that are more important than others and you want to maintain a level of performance for that (application) process.
> > 
> > An example might be if other (applications) processes hog the cpu's, therby lowering the level of performace of the more important process.
> 
> Wouldn't changing the priority be a better solution?  Or else "nice" 
> down those compute-hogs so they don't slow down the "important"
> applications?
> 

I think were getting to a case by case basis. In one situation yes maybe
prioritizing the processes would be enough but the in others the only
sure way is using affinity.

Since it is clear that the future is going back to a scale up
environment these utilities will become more important.


> 
> 
> > 
> > This might be unacceptable which is why processor affinity is required.
> > 
> > These utilities are very valuable on scale up boxes versus scale out where problems like this are frequent.
> > 
> >