Intel® VTune™ Amplifier XE and Intel® VTune™ Amplifier for Systems Help
This metric estimates reliability of HW event-related metrics. Since the number of collected HW events exceeds the number of counters, VTune Amplifier uses event multiplexing (MUX) to share HW counters and collect different subsets of events over time. This may affect the precision of collected event data. The ideal value for this metric is 1. If the value is less than 0.5, the collected data may be not reliable.
Precision of collected HW event data is not enough. Metrics data may be unreliable. Consider increasing your application execution time, using the multiple runs mode instead of event multiplexing, or creating a custom analysis with a limited subset of HW events.