Recently I have started using Intel Performance Counters Monitor tool, version 2.3. As far as i understood, I may cutomize it a bit in order to measure the desired metrics. However, one question appeared:
Does PCM support uncore\offcore events of SandyBridge\IvyBridge processors? (usual ones, not EP) The ones I need are:
Also, when I launch ./pcm-x it shows "N/A" in the Read / Write columns.
Thanks in advance.
I've been told that this support requires support from the BIOS, so it may or may not work on a given platform.
This is true for the PCM tool as well as many other tools/libraries that want to get this information.
I've been told the "Romley" Sandy Bridge reference platform does not have such support, and have not been told of plans to add such support.
I can't find the threads that say this, but they are on software.intel.com.
Some of the threads I was thinking of are:
Not sure if these map 100% to what you are trying to accomplish...
>>>I've been told that this support requires support from the BIOS, so it may or may not work on a given platform>>>
Uncore PMU registers both control and counters can be accessed by kernel mode driver (Windows platform).
I am reviewing performance counter these days. I found that the number of counter is less than total events.
I want to know if there is any solution to monitor most of the events.
Or I only can select 4 or 8 events to monitor.
the technique to monitor more events than the number of hardware counters is called "event multiplexing". The performance tool monitors different subsets of events for short periods of time and then extrapolates the event counts to the whole measurement period. This works well for steady state workloads but not for workloads with rapidly changing characteristics. Intel PCM does not support multiplexing but there are other PMU tools that do: for example Intel VTune Amplifier XE.