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/*
* Copyright (c) 2003, 2022, 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 4858522
* @summary Basic unit test of OperatingSystemMXBean.getTotalSwapSpaceSize()
* @author Steve Bohne
* @author Jaroslav Bachorik
*
* @library /test/lib
*
* @run main TestTotalSwap
*/
/*
* This test tests the actual swap size on Linux and MacOS only.
*/
import com.sun.management.OperatingSystemMXBean;
import java.lang.management.*;
import jdk.test.lib.Platform;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
public class TestTotalSwap {
private static final OperatingSystemMXBean mbean =
(com.sun.management.OperatingSystemMXBean)
ManagementFactory.getOperatingSystemMXBean();
// Careful with these values.
// Min size for pass dynamically determined below.
// zero if no swap space is configured.
private static long min_size_for_pass = 0;
private static final long MAX_SIZE_FOR_PASS = Long.MAX_VALUE;
public static void main(String args[]) throws Throwable {
// yocto might ignore the request to report swap size in bytes
boolean swapInKB = mbean.getVersion().contains("yocto");
long min_size = mbean.getFreeSwapSpaceSize();
if (min_size > 0) {
min_size_for_pass = min_size;
}
long expected_swap_size = getSwapSizeFromOs();
long size = mbean.getTotalSwapSpaceSize();
System.out.println("Total swap space size from OS in bytes: " + expected_swap_size);
System.out.println("Total swap space size in MBean bytes: " + size);
// if swap data from OS chnaged re-read OS and MBean data
while (expected_swap_size != getSwapSizeFromOs()) {
System.out.println("Total swap space reported by OS changed form " + expected_swap_size
+ " current value = " + getSwapSizeFromOs());
expected_swap_size = getSwapSizeFromOs();
size = mbean.getTotalSwapSpaceSize();
System.out.println("Re-read total swap space size from OS in bytes: " + expected_swap_size);
System.out.println("Total swap space size in MBean bytes: " + size);
}
if (expected_swap_size > -1) {
if (size != expected_swap_size) {
// try the expected size in kiloBytes
if (!(swapInKB && expected_swap_size * 1024 == size)) {
throw new RuntimeException("Expected total swap size : " +
expected_swap_size +
" but getTotalSwapSpaceSize returned: " +
size);
}
}
}
// sanity check
if (size < min_size_for_pass || size > MAX_SIZE_FOR_PASS) {
throw new RuntimeException("Total swap space size " +
"illegal value: " + size + " bytes " +
"(MIN = " + min_size_for_pass + "; " +
"MAX = " + MAX_SIZE_FOR_PASS + ")");
}
System.out.println("Test passed.");
}
private static long getSwapSizeFromOs() throws Throwable {
if (Platform.isLinux()) {
// total used free shared buffers cached
// Mem: 16533540864 13638467584 2895073280 534040576 1630248960 6236909568
// -/+ buffers/cache: 5771309056 10762231808
// Swap: 15999168512 0 15999168512
String swapSizeStr = ProcessTools.executeCommand("free", "-b")
.firstMatch("Swap:\\s+([0-9]+)\\s+.*", 1);
return Long.parseLong(swapSizeStr);
} else if (Platform.isOSX()) {
// total = 8192.00M used = 7471.11M free = 720.89M (encrypted)
String swapSizeStr = ProcessTools.executeCommand(
"/usr/sbin/sysctl",
"-n",
"vm.swapusage"
).firstMatch("total\\s+=\\s+([0-9]+(\\.[0-9]+)?[Mm]?).*", 1);
if (swapSizeStr.toLowerCase().endsWith("m")) {
swapSizeStr = swapSizeStr.substring(0, swapSizeStr.length() - 1);
return (long)(Double.parseDouble(swapSizeStr) * 1024 * 1024); // size in MB
}
return (long)(Double.parseDouble(swapSizeStr) * 1024 * 1024);
} else {
System.err.println("Unsupported operating system: " + Platform.getOsName());
}
return -1;
}
}
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