Dual-Core and Quad-Core performance question

[Tom Greaser]

Something you may need to test with is setting the affinity  of the process to your cpu(s) Just like Burke, Thomas G  did a great job talking about bus bottle necks. You dont want the process to lose its VALUABLE L1 cache when running. 
example 4 cpu system set affinity for your dbase to use 3 out of the 4 cpus. 
taskset -c 3,4 MUMPS 

And possibly playing with your schedulers if this is a MUMPS only dbase server. 
you can really tweak your OS out to work well with it. 




Hello: 
        Can anyone point me to some information about the performance 
differences of say the following systems. 

A) 4 Single-Core CPUs running at 3.0GHz 

B) 2 Dual-Core CPUs running at 3.0GHz 

C) 1 Quad-Core CPU running at 3.0GHz 

Everything else being the same, that is 4GB of memory, disk, etc... 

        The reason I ask, is I have been told that a Dual-Core System 
will only give about a 25% performance improvement over 1 Single-Core 
system. That is not it is not twice as fast. 

---- 
Thanks: 
Jack Allen