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/*
* Copyright (c) 2005, 2012, 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.
*/
/*
*
*
* @bug 6336608 6511738
* @summary Basic unit test of OperatingSystemMXBean.getSystemLoadAverage()
* @author Mandy Chung
*/
/*
* This test tests the load average on linux and solaris. On Windows,
* getSystemLoadAverage() returns -1.
*
* Usage: GetSystemLoadAverage ["-1.0"]
* Arguments:
* o If no argument is specified, the test will verify the system load
* average with the /usr/bin/uptime command.
* o Otherwise, the input argument must be "-1.0" indicating the
* expected system load average. This would only be the case when
* running on Windows.
*/
import java.lang.management.*;
import java.io.*;
public class GetSystemLoadAverage {
private static OperatingSystemMXBean mbean =
ManagementFactory.getOperatingSystemMXBean();
// The system load average may be changing due to other jobs running.
// Allow some delta.
private static double DELTA = 0.05;
public static void main(String args[]) throws Exception {
if (args.length > 1) {
throw new IllegalArgumentException("Unexpected number of args " + args.length);
}
if (args.length == 0) {
// On Linux or Solaris
checkLoadAvg();
} else {
// On Windows, the system load average is expected to be -1.0
if (!args[0].equals("-1.0")) {
throw new IllegalArgumentException("Invalid argument: " + args[0]);
} else {
double loadavg = mbean.getSystemLoadAverage();
if (loadavg != -1.0) {
throw new RuntimeException("Expected load average : -1.0" +
" but getSystemLoadAverage returned: " +
loadavg);
}
}
}
System.out.println("Test passed.");
}
private static String LOAD_AVERAGE_TEXT
= System.getProperty("os.name").contains("OS X")
? "load averages:"
: "load average:";
private static void checkLoadAvg() throws Exception {
// Obtain load average from OS command
ProcessBuilder pb = new ProcessBuilder("/usr/bin/uptime");
Process p = pb.start();
String output = commandOutput(p);
// obtain load average from OperatingSystemMXBean
double loadavg = mbean.getSystemLoadAverage();
// verify if two values are close
output = output.substring(output.lastIndexOf(LOAD_AVERAGE_TEXT) +
LOAD_AVERAGE_TEXT.length() + 1);
System.out.println("Load average returned from uptime = " + output);
System.out.println("getSystemLoadAverage() returned " + loadavg);
String[] lavg = System.getProperty("os.name").contains("OS X")
? output.split(" ")
: output.split(",");
double expected = Double.parseDouble(lavg[0]);
double lowRange = expected * (1 - DELTA);
double highRange = expected * (1 + DELTA);
if (loadavg < lowRange || loadavg > highRange) {
throw new RuntimeException("Expected load average : " +
expected +
" but getSystemLoadAverage returned: " +
loadavg);
}
}
private static String commandOutput(Reader r) throws Exception {
StringBuilder sb = new StringBuilder();
int c;
while ((c = r.read()) > 0) {
if (c != '\r') {
sb.append((char) c);
}
}
return sb.toString();
}
private static String commandOutput(Process p) throws Exception {
Reader r = new InputStreamReader(p.getInputStream(),"UTF-8");
String output = commandOutput(r);
p.waitFor();
p.exitValue();
return output;
}
}
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