1 /*
   2  * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.jfr.event.os;
  27 
  28 import java.util.List;
  29 
  30 import jdk.jfr.Recording;
  31 import jdk.jfr.consumer.RecordedEvent;
  32 import jdk.test.lib.jfr.EventNames;
  33 import jdk.test.lib.jfr.Events;
  34 
  35 
  36 /**
  37  * @test
  38  * @key jfr
  39  *
  40  * @library /lib /
  41  * @run main/othervm jdk.jfr.event.os.TestCPULoad
  42  */
  43 public class TestCPULoad {
  44     private final static String EVENT_NAME = EventNames.CPULoad;
  45 
  46     public static void main(String[] args) throws Throwable {
  47         Recording recording = new Recording();
  48         recording.enable(EVENT_NAME);
  49         recording.start();
  50         // Need to sleep so a time delta can be calculated
  51         Thread.sleep(100);
  52         recording.stop();
  53 
  54         List<RecordedEvent> events = Events.fromRecording(recording);
  55         if (events.isEmpty()) {
  56             // CPU Load events are unreliable on Windows because
  57             // the way processes are identified with perf. counters.
  58             // See BUG 8010378.
  59             // Workaround is to detect Windows and allow
  60             // test to pass if events are missing.
  61             if (isWindows()) {
  62                 return;
  63             }
  64             throw new AssertionError("Expected at least one event");
  65         }
  66         for (RecordedEvent event : events) {
  67             System.out.println("Event: " + event);
  68             for (String loadName : loadNames) {
  69                 Events.assertField(event, loadName).atLeast(0.0f).atMost(1.0f);
  70             }
  71         }
  72     }
  73 
  74     private static final String[] loadNames = {"jvmUser", "jvmSystem", "machineTotal"};
  75 
  76     private static boolean isWindows() {
  77         return System.getProperty("os.name").startsWith("Windows");
  78     }
  79 }