Yes, PMCs (CPU performance monitoring counters; also known by many other terms, such as PMU counters, PICs, CPCs, etc). In the past I&#x27;ve written tools that print usage of memory busses (really, CPU interconnect ports) via the PMCs.<p>They are also a PITA to work with.<p>As another person said, it shows up as CPU utilization. So I check that along with IPC (instructions per cycle), and if IPC is low (what &quot;low&quot; is depends, but say, &lt; 1.0), then that&#x27;s a good clue you&#x27;re blocked on memory.<p>... but of course, I want actual throughput (usage), bandwidth (maximum), and utilization (ratio), which is more digging with the PMCs.