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25 package jdk.jfr.event.gc.detailed;
26 
27 import java.util.List;
28 
29 import jdk.jfr.Recording;
30 import jdk.jfr.consumer.RecordedEvent;
31 import jdk.test.lib.jfr.EventNames;
32 import jdk.test.lib.jfr.Events;
33 
34 /**
35  * @test
36  * @key jfr
37  *
38  *
39  * @library /lib /
40  * @run main/othervm -XX:NewSize=2m -XX:MaxNewSize=2m -Xmx32m -XX:+UseG1GC -XX:MaxGCPauseMillis=75 -XX:GCPauseIntervalMillis=150 -XX:+UnlockExperimentalVMOptions -XX:-UseFastUnorderedTimeStamps jdk.jfr.event.gc.detailed.TestG1MMUEvent
41  */
42 public class TestG1MMUEvent {
43 
44     // Corresponds to command-line setting -XX:GCPauseIntervalMillis=150
45     private final static double TIME_SLICE = 0.15;
46 
47     // Corresponds to command-line setting -XX:MaxGCPauseMillis=75
48     private final static double MAX_GC_TIME = 0.075;
49 
50     private final static String EVENT_NAME = EventNames.G1MMU;
51 
52     public static byte[] bytes;
53 
main(String[] args)54     public static void main(String[] args) throws Exception {
55 
56         Recording recording = new Recording();
57 
58         // activate the event we are interested in and start recording
59         recording.enable(EVENT_NAME);
60         recording.start();
61 
62         // Setting NewSize and MaxNewSize will limit eden, so
63         // allocating 1024 5k byte arrays should trigger at
64         // least one Young GC.
65         for (int i = 0; i < 1024; i++) {
66             bytes  = new byte[5 * 1024];
67         }
68         recording.stop();
69 
70         // Verify recording
71         List<RecordedEvent> all = Events.fromRecording(recording);
72         Events.hasEvents(all);
73 
74         for (RecordedEvent e : all) {
75             Events.assertField(e, "gcId").above(0);
76             Events.assertField(e, "timeSlice").isEqual(TIME_SLICE);
77             Events.assertField(e, "pauseTarget").isEqual(MAX_GC_TIME);
78         }
79 
80         recording.close();
81     }
82 }
83