PerfMonitor is a processor performance monitoring tool. It allows to track the frequency of 4 events choosen in a set of model-specific list.

PerfMonitor can be used to identify the performance bottlenecks of a system, or to monitor a program for cache-miss rate or mis-predicted branches. But PerfMonitor can also be used as a hardware-level CPU comparison tool, comparing the key parameters of different CPUs runnning the same benchmark.