I need to measure how many seconds takes to execute a particular method via JFR. It is possible to do that? I tried async-profiler but I don't this feature.
1 Answers
If you have access to the source code, you can create an event:
@StackTrace(false)
@Name("MethodExecution")
@Label("Method Execution")
static class MethodExecution extends jdk.jfr.Event {
}
public void foo() {
MethodExecution event = new MethodExecution();
event.begin();
bar();
event.commit();
}
Then start JFR:
$ java -XX:StartFlightRecording:filename=measurement.jfr ...
Open the file in JDK Mission Control, or use the 'jfr' utility to print the results:
$ jfr print --events MethodExecution measurement.jfr
If you don't have access to the source, you may want to look into the JMC Agent that can add similar code like above using bytecode instrumentation.
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