/*
* Copyright (c) 2013, 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
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*/
/* @test
* @bug 8022584
* @summary Some NetworkInterface methods can leak native memory
* @run main/othervm/timeout=700 MemLeakTest
*/
/* Note: the test can cause a memory leak that's why othervm option is required
*/
import java.io.BufferedReader;
import java.io.FileReader;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Collection;
import java.util.Collections;
public class MemLeakTest {
/**
* Memory leak is assumed, if application consumes more than specified amount of memory during its execution.
* The number is given in Kb.
*/
private static final long MEM_LEAK_THRESHOLD = 32 * 1024; // 32Mb
public static void main(String[] args)
throws Exception {
if (!System.getProperty("os.name").equals("Linux")) {
System.out.println("Test only runs on Linux");
return;
}
// warm up
accessNetInterfaces(3);
long vMemBefore = getVMemSize();
accessNetInterfaces(500_000);
long vMemAfter = getVMemSize();
long vMemDelta = vMemAfter - vMemBefore;
if (vMemDelta > MEM_LEAK_THRESHOLD) {
throw new Exception("FAIL: Virtual memory usage increased by " + vMemDelta + "Kb " +
"(greater than " + MEM_LEAK_THRESHOLD + "Kb)");
}
System.out.println("PASS: Virtual memory usage increased by " + vMemDelta + "Kb " +
"(not greater than " + MEM_LEAK_THRESHOLD + "Kb)");
}
private static void accessNetInterfaces(int times) {
try {
Collection<NetworkInterface> interfaces =
Collections.list(NetworkInterface.getNetworkInterfaces());
for (int i = 0; i != times; ++i) {
for (NetworkInterface netInterface : interfaces) {
netInterface.getMTU();
netInterface.isLoopback();
netInterface.isUp();
netInterface.isPointToPoint();
netInterface.supportsMulticast();
}
}
} catch (SocketException ignore) {}
}
/**
* Returns size of virtual memory allocated to the process in Kb.
* Linux specific. On other platforms and in case of any errors returns 0.
*/
private static long getVMemSize() {
// Refer to the Linux proc(5) man page for details about /proc/self/stat file
//
// In short, this file contains status information about the current process
// written in one line. The fields are separated with spaces.
// The 23rd field is defined as 'vsize %lu Virtual memory size in bytes'
try (FileReader fileReader = new FileReader("/proc/self/stat");
BufferedReader bufferedReader = new BufferedReader(fileReader)) {
String line = bufferedReader.readLine();
return Long.parseLong(line.split(" ")[22]) / 1024;
} catch (Exception ignore) {}
return 0;
}
}