russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
108 lines
3.7 KiB
Java
108 lines
3.7 KiB
Java
/*
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* Copyright (c) 2003, 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 4858522
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* @summary Basic unit test of OperatingSystemMXBean.getProcessCpuTime()
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* @library /test/lib
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* @author Steve Bohne
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*/
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/*
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* This test is just a sanity check and does not check for the correct
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* value. The correct value should be checked manually:
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* Solaris/Linux:
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* 1. In a shell, enter the command: "ps -ef"
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* 2. The value (reported in seconds) is in the "TIME" column for the process
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* Windows NT/XP/2000:
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* 1. Hit Ctrl-Alt-Delete, select Task Manager, select Processes tab
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* 2. The value (reported in seconds) is in the "CPU Time" column for the
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* process. You may have to add this column via View menu-> Select
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* Columns... item.
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* Windows 98/ME:
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* Not supported.
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*/
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import com.sun.management.OperatingSystemMXBean;
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import java.lang.management.*;
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import jdk.test.lib.Platform;
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public class GetProcessCpuTime {
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private static OperatingSystemMXBean mbean =
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(com.sun.management.OperatingSystemMXBean)
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ManagementFactory.getOperatingSystemMXBean();
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// Careful with these values.
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private static final long MIN_TIME_FOR_PASS = 1;
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private static final long MAX_TIME_FOR_PASS = Long.MAX_VALUE / 10_000_000;
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private static boolean trace = false;
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public static void main(String args[]) throws Exception {
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if (args.length > 0 && args[0].equals("trace")) {
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trace = true;
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}
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// Consume cpu time
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double sum=0;
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for (int i=0; i <=2000000; i++) {
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sum += i;
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sum /= i;
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}
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long ns = mbean.getProcessCpuTime();
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if (ns == -1 && Platform.isWindows()) {
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// Some Windows 2019 systems can return -1 for the first few reads.
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for (int i = 0; i < 10; i++) {
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ns = mbean.getProcessCpuTime();
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if (ns != -1) {
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break;
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}
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try {
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Thread.sleep(200);
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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}
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}
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if (ns == -1) {
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throw new RuntimeException("getProcessCpuTime() is not supported");
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}
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if (trace) {
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System.out.println("Process CPU time in ns: " + ns);
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}
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if (ns < MIN_TIME_FOR_PASS || ns > MAX_TIME_FOR_PASS) {
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throw new RuntimeException("Process CPU time " +
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"illegal value: " + ns + " ns " +
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"(MIN = " + MIN_TIME_FOR_PASS + "; " +
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"MAX = " + MAX_TIME_FOR_PASS + ")");
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}
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System.out.println("Test passed.");
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}
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}
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