Intel® VTune™ Amplifier
This metric estimates reliability of hardware event-related metrics. Since the number of collected hardware events exceeds the number of counters, Intel® VTune™ Amplifier uses event multiplexing (MUX) to share hardware counters and collect different subsets of events over time. This may affect the precision of the collected event data.
Hover over a column header to view the formula used for metric calculation.
Precision of collected hardware 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 hardware events.
The ideal value for this metric is 1. A high value for this metric does not guarantee accuracy of the hardware event-based metrics. However, a low value (less than 0.5) definitely puts the metrics in question and you should examine, using the Allow multiple runs option, or increase the execution time to increase the accuracy.