test/jdk/jdk/jfr/event/os/TestCPULoad.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package jdk.jfr.event.os;

import java.util.List;

import jdk.jfr.Recording;
import jdk.jfr.consumer.RecordedEvent;
import jdk.test.lib.jfr.EventNames;
import jdk.test.lib.jfr.Events;


/*
 * @test
 * @key jfr
 * @library /test/lib
 * @run main/othervm jdk.jfr.event.os.TestCPULoad
 */
public class TestCPULoad {
    private final static String EVENT_NAME = EventNames.CPULoad;

    public static void main(String[] args) throws Throwable {
        Recording recording = new Recording();
        recording.enable(EVENT_NAME);
        recording.start();
        // Need to sleep so a time delta can be calculated
        Thread.sleep(100);
        recording.stop();

        List<RecordedEvent> events = Events.fromRecording(recording);
        if (events.isEmpty()) {
            // CPU Load events are unreliable on Windows because
            // the way processes are identified with perf. counters.
            // See BUG 8010378.
            // Workaround is to detect Windows and allow
            // test to pass if events are missing.
            if (isWindows()) {
                return;
            }
            throw new AssertionError("Expected at least one event");
        }
        for (RecordedEvent event : events) {
            System.out.println("Event: " + event);
            for (String loadName : loadNames) {
                Events.assertField(event, loadName).atLeast(0.0f).atMost(1.0f);
            }
        }
    }

    private static final String[] loadNames = {"jvmUser", "jvmSystem", "machineTotal"};

    private static boolean isWindows() {
        return System.getProperty("os.name").startsWith("Windows");
    }
}