92 lines
3.5 KiB
Java
92 lines
3.5 KiB
Java
/*
|
|
* Copyright (c) 2003, 2015, 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.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* @test
|
|
* @bug 4530538
|
|
* @summary Basic Test for HotspotThreadMBean.getInternalThreadCount()
|
|
* and getInternalThreadCpuTime()
|
|
* @author Mandy Chung
|
|
*
|
|
* @run main/othervm -XX:+UsePerfData GetInternalThreads
|
|
*/
|
|
|
|
import sun.management.*;
|
|
import java.util.*;
|
|
import java.lang.management.ThreadMXBean;
|
|
import java.lang.management.ManagementFactory;
|
|
|
|
public class GetInternalThreads {
|
|
private final static HotspotThreadMBean mbean =
|
|
ManagementFactoryHelper.getHotspotThreadMBean();
|
|
|
|
// Minimum number of VM internal threads
|
|
// VM thread, watcher thread, Low memory detector, compiler thread
|
|
private static final long MIN_VALUE_FOR_PASS = 4;
|
|
private static final long MAX_VALUE_FOR_PASS = Long.MAX_VALUE;
|
|
|
|
public static void main(String[] args) throws Exception {
|
|
long value = mbean.getInternalThreadCount();
|
|
|
|
if (value < MIN_VALUE_FOR_PASS || value > MAX_VALUE_FOR_PASS) {
|
|
throw new RuntimeException("Internal thread count " +
|
|
"illegal value: " + value + " " +
|
|
"(MIN = " + MIN_VALUE_FOR_PASS + "; " +
|
|
"MAX = " + MAX_VALUE_FOR_PASS + ")");
|
|
}
|
|
|
|
System.out.println("Internal Thread Count = " + value);
|
|
|
|
ThreadMXBean thread =
|
|
ManagementFactory.getThreadMXBean();
|
|
if (!thread.isThreadCpuTimeSupported()) {
|
|
System.out.println("Thread Cpu Time is not supported.");
|
|
return;
|
|
}
|
|
|
|
while(!testCPUTime()) {
|
|
Thread.sleep(100);
|
|
}
|
|
}
|
|
|
|
private static boolean testCPUTime() {
|
|
Map<String, Long> times = mbean.getInternalThreadCpuTimes();
|
|
for(Map.Entry<String, Long> entry : times.entrySet()) {
|
|
String threadName = entry.getKey();
|
|
long cpuTime = entry.getValue();
|
|
System.out.println("CPU time = " + cpuTime + " for " + threadName);
|
|
if (cpuTime == -1) {
|
|
// Can happen when there is a race between a thread being created
|
|
// and the request to get its CPU time. The "/proc/..." structure might
|
|
// not be ready at that time and the routine will return -1.
|
|
System.out.println("Retry, proc structure might not be ready (-1)");
|
|
return false;
|
|
}
|
|
if (cpuTime < 0) {
|
|
throw new RuntimeException("Illegal CPU time: " + cpuTime);
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
}
|