[haglin]

An alternative to avoid safepoints (only samples executing threads)

    var r = new RecordingStream();
    r.enable("jdk.ExecutionSample").withStackTrace().withPeriod(Duration.ofMillis(1));
    r.onEvent("jdk.ExecutionSample", e -> {
        store.addSample(e.getStackTrace().getFrames());
    });   
    r.startAsync();
    ...

[omazurov]

You get JFR's precision but inherit its blind spots as described in [1]:

> demo1: ... JFR will not report anything useful at all, since it cannot traverse stack traces when JVM is running System.arraycopy()

I'd rather run jstack in a loop than lose System.arraycopy() (or, in fact, any native code be it JVM's or JNI).

[1] https://github.com/apangin/java-profiling-presentation

[parttimenerd]

I would rather use Andrei Pangin's async-profiler than doing something custom with jstack.