Создать такой инструмент легко, используя API анализа JFR .
import jdk.jfr.consumer.RecordingFile;
import java.nio.file.Paths;
import java.util.HashMap;
public class JfrTop {
public static void main(String[] args) throws Exception {
var fileName = args[0];
var packageName = args.length > 1 ? args[1] : "";
var top = args.length > 2 ? Integer.parseInt(args[2]) : 10;
var hotMethods = new HashMap<String, Long>();
long total = 0;
try (var recording = new RecordingFile(Paths.get(fileName))) {
while (recording.hasMoreEvents()) {
var event = recording.readEvent();
if (event.getEventType().getName().equals("jdk.ExecutionSample")) {
var stackTrace = event.getStackTrace();
if (stackTrace != null && stackTrace.getFrames().size() > 0) {
var method = stackTrace.getFrames().get(0).getMethod();
var className = method.getType().getName();
if (className.startsWith(packageName)) {
var fullName = className + '.' + method.getName() + method.getDescriptor();
hotMethods.compute(fullName, (key, val) -> val == null ? 1L : (val + 1));
}
}
total++;
}
}
}
double percent = 100.0 / total;
hotMethods.entrySet().stream()
.sorted((e1, e2) -> Long.compare(e2.getValue(), e1.getValue()))
.limit(top)
.forEachOrdered(e -> System.out.printf("%5.2f%% %s\n", e.getValue() * percent, e.getKey()));
}
}
Как запустить:
java JfrTop idea.jfr com.intellij.openapi.editor 10
Пример вывода:
20,35% com.intellij.openapi.editor.impl.RangeHighlighterTree$RHNode.recalculateRenderFlags()V
4,20% com.intellij.openapi.editor.impl.IntervalTreeImpl.maxEndOf(Lcom/intellij/openapi/editor/impl/IntervalTreeImpl$IntervalNode;I)I
3,19% com.intellij.openapi.editor.impl.IntervalTreeImpl.assertAllDeltasAreNull(Lcom/intellij/openapi/editor/impl/IntervalTreeImpl$IntervalNode;)V
2,19% com.intellij.openapi.editor.impl.IntervalTreeImpl$IntervalNode.computeDeltaUpToRoot()I
1,94% com.intellij.openapi.editor.impl.IntervalTreeImpl.pushDelta(Lcom/intellij/openapi/editor/impl/IntervalTreeImpl$IntervalNode;)Z
1,63% com.intellij.openapi.editor.impl.IntervalTreeImpl$IntervalNode.hasAliveKey(Z)Z
1,50% com.intellij.openapi.editor.impl.IntervalTreeImpl.correctMax(Lcom/intellij/openapi/editor/impl/IntervalTreeImpl$IntervalNode;I)V
1,31% com.intellij.openapi.editor.impl.IntervalTreeImpl$1.hasNext()Z
0,88% com.intellij.openapi.editor.impl.IntervalTreeImpl$IntervalNode.tryToSetCachedValues(IZI)Z
0,63% com.intellij.openapi.editor.impl.IntervalTreeImpl.findOrInsert(Lcom/intellij/openapi/editor/impl/IntervalTreeImpl$IntervalNode;)Lcom/intellij/openapi/editor/impl/IntervalTreeImpl$IntervalNode;