| /* |
| * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.jfr.api.recording.event; |
| |
| import java.io.IOException; |
| import java.time.Duration; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import jdk.jfr.Recording; |
| import jdk.jfr.consumer.RecordedEvent; |
| import jdk.jfr.consumer.RecordedThread; |
| import jdk.test.lib.Asserts; |
| import jdk.test.lib.jfr.EventNames; |
| import jdk.test.lib.jfr.Events; |
| |
| /* |
| * @test |
| * @summary Test event period. |
| * @key jfr |
| * @library /test/lib |
| * @run main/othervm jdk.jfr.api.recording.event.TestPeriod |
| */ |
| public class TestPeriod { |
| private static final String EVENT_PATH = EventNames.ThreadAllocationStatistics; |
| private static final long ERROR_MARGIN = 20; // 186 ms has been measured, when period was set to 200 ms |
| |
| public static void main(String[] args) throws Throwable { |
| long[] periods = { 100, 200 }; |
| int eventCount = 4; |
| int deltaCount; |
| for (long period : periods) { |
| List<Long> deltaBetweenEvents; |
| do { |
| deltaBetweenEvents = createPeriodicEvents(period, eventCount); |
| deltaCount = deltaBetweenEvents.size(); |
| if (deltaCount < eventCount - 1) { |
| System.out.println("Didn't get sufficent number of events. Retrying..."); |
| System.out.println(); |
| } |
| } while (deltaCount < eventCount - 1); |
| for (int i = 0; i < eventCount - 1; i++) { |
| verifyDelta(deltaBetweenEvents.get(i), period); |
| } |
| System.out.println(); |
| } |
| } |
| |
| private static List<Long> createPeriodicEvents(long period, int eventCount) throws Exception, IOException { |
| System.out.println("Provoking events with period " + period + " ms"); |
| Recording r = new Recording(); |
| r.start(); |
| runWithPeriod(r, period, eventCount + 1); |
| r.stop(); |
| |
| long prevTime = -1; |
| List<Long> deltas = new ArrayList<>(); |
| for (RecordedEvent event : Events.fromRecording(r)) { |
| if (Events.isEventType(event, EVENT_PATH) && isMyThread(event)) { |
| long timeMillis = event.getEndTime().toEpochMilli(); |
| if (prevTime != -1) { |
| long delta = timeMillis - prevTime; |
| deltas.add(delta); |
| System.out.printf("event: time=%d, delta=%d%n", timeMillis, delta); |
| } |
| prevTime = timeMillis; |
| } |
| } |
| r.close(); |
| return deltas; |
| } |
| |
| // We only check that time is at least as expected. |
| // We ignore if time is much longer than expected, since anything can happen |
| // during heavy load, |
| private static void verifyDelta(long actual, long expected) { |
| System.out.printf("verifyDelta: actaul=%d, expected=%d (errorMargin=%d)%n", actual, expected, ERROR_MARGIN); |
| Asserts.assertGreaterThan(actual, expected - ERROR_MARGIN, "period delta too short"); |
| } |
| |
| private static boolean isMyThread(RecordedEvent event) { |
| Object o = event.getValue("thread"); |
| if (o instanceof RecordedThread) { |
| RecordedThread rt = (RecordedThread) o; |
| return Thread.currentThread().getId() == rt.getJavaThreadId(); |
| } |
| return false; |
| } |
| |
| @SuppressWarnings("unused") |
| private static byte[] dummy = null; |
| |
| // Generate at least minEvents event with given period |
| private static void runWithPeriod(Recording r, long period, int minEventCount) throws Exception { |
| r.enable(EVENT_PATH).withPeriod(Duration.ofMillis(period)); |
| long endTime = System.currentTimeMillis() + period * minEventCount; |
| while (System.currentTimeMillis() < endTime) { |
| dummy = new byte[100]; |
| Thread.sleep(1); |
| } |
| } |
| |
| } |