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.
70 lines
2.5 KiB
Java
70 lines
2.5 KiB
Java
/*
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* Copyright (c) 2011, 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 7028071
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* @summary Basic unit test of OperatingSystemMXBean.getProcessCpuLoad()
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* @library /test/lib
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* @run main GetSystemCpuLoad
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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 GetSystemCpuLoad {
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public static void main(String[] argv) throws Exception {
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OperatingSystemMXBean mbean = (com.sun.management.OperatingSystemMXBean)
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ManagementFactory.getOperatingSystemMXBean();
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Exception ex = null;
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double load;
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for (int i = 0; i < 10; i++) {
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load = mbean.getSystemCpuLoad();
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if (load == -1.0 && Platform.isWindows()) {
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// Some Windows 2019 systems can return -1 for the first few reads.
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// Remember a -1 in case it never gets better.
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ex = new RuntimeException("getSystemCpuLoad() returns " + load
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+ " which is not in the [0.0,1.0] interval");
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} else if (load < 0.0 || load > 1.0) {
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throw new RuntimeException("getSystemCpuLoad() returns " + load
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+ " which is not in the [0.0,1.0] interval");
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} else {
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// A good reading: forget any previous -1.
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ex = null;
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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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if (ex != null) {
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throw ex;
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}
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}
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}
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