I read from somwhere saying that some events are contradicting with each other so that they can not be monitored at the same time(probably can be do by time-multiplexing). So my question is: how can we know that?
I am using an Ivy-bridge processor. I use Perf tool in Ubuntu. I tried some combinations of 4 events in the event table and it looks like they all can be monitored at the same time... Is there any other tool which can tell?