Retrieve the duration of event "Sample profiling method.

Hello

I'm trying to understand how the JMC calculates the percentage of hot methods (which, according to the documentation, is the total time that the application has spent on the execution of code in the method), but the time I recover seem to be always zero and start and end timestamp is the same. The way I'm doing it follow below:


Registration of FlightRecording is FlightRecordingLoader.loadFile (new file ("jfr file path"));.

View IView = recording.createView ();

Map < String, IEventType > eventTypes = new HashMap < String, IEventType > ();

for (arisen event: view) {}

eventTypes.put (event.getEventType () .getName (), event.getEventType ());

}

view.setEventTypes (Arrays.asList (eventTypes.get ('profiling Sample method')));

for (arisen event: view) {}

System.out.println (Event.GetValue ("(Duration)") + "" + ((FLRMethod) event.getValue ("((stackTrace) .method)")) .getMethodName ());

}

Any clarification is very appreciated!

Thanks in advance.

The sample profiling method do not have a duration,

they are taken at intervals of 20 ms, for example, where a set number of threads is sampled.

All threads cannot be sampled, for example ones that run native code.

It really is "the percentage of the total number of samples taken in this method", which can be considered as an approximation of what the aide said "the percentage of the total time that the application passed on the execution of code in the method.

To get this regroup all the samples with the same Executive, there is not a single sample for each method with a total length of this method.

If you examine the event log and not activate Java Virtual Machine/method/profiling profiling sample in case types discovered, you will be able to see what kind of data you get.

Tags: Java

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