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In the Windows PerfMon tool it is possible to add many types of counters.

What is the difference between the objects Processor and Processor Information?

For example, they both have the counters: User time, Processor Time and Privilege time. So what's the difference?

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2 Answers 2

Take a look at this TechNet blog for more info. (I'm trying to figure it out now too!)

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The difference is only relevant on a machine with more than one NUMA node. On such machines, the processors in "Processor Information" are identified by their NUMA node and their number within the node. For example, if you have two nodes with four processors each, then "Processor information" would enumerate them as

0,0
0,1
0,2
0,3
1,0
1,1
1,2
1,3

The first number of each pair is the NUMA node number. "Processor Information" also provides pseudo-instances that give node-specific totals (0,_Total and 1,_Total for the preceding example).

In "Processor" the processors are simply numbered serially and there is a single system-wide _Total instance, no matter how many NUMA nodes there are.

A NUMA machine these days would normally use one of the modern point-to-point interconnects (QPI or HyperTransport) and would have more than one physical CPU socket. In these platforms, each CPU socket is its own NUMA node, with its own set of DIMM slots. Being able to easily identify CPU usage within the NUMA nodes is important in some performance tuning scenarios.

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