85 lines
3.5 KiB
Java
85 lines
3.5 KiB
Java
/*
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* Copyright (c) 2011, 2013 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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import java.io.*;
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public class RetransformBigClassApp {
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/**
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* Memory leak is assumed, if application consumes more than specified amount of memory during its execution.
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* The number is given in Kb.
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*/
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private static final long MEM_LEAK_THRESHOLD = 32 * 1024; // 32Mb
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public static void main(String[] args) throws Exception {
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System.out.println("Creating instance of " +
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RetransformBigClassAgent.clz);
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RetransformBigClassAgent.clz.newInstance();
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long vMemBefore = getVMemSize();
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int count = 0;
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while (!RetransformBigClassAgent.doneRetransforming) {
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System.out.println("App loop count: " + ++count);
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try {
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Thread.sleep(10 * 1000);
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} catch (InterruptedException ie) {
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}
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}
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System.out.println("App looped " + count + " times.");
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long vMemAfter = getVMemSize();
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if (vMemBefore == 0 || vMemAfter == 0) {
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System.err.println("WARNING: Cannot perform memory leak detection on this OS");
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} else {
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long vMemDelta = vMemAfter - vMemBefore;
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if (vMemDelta > MEM_LEAK_THRESHOLD) {
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System.err.println("FAIL: Virtual memory usage increased by " + vMemDelta + "Kb " +
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"(greater than " + MEM_LEAK_THRESHOLD + "Kb)");
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System.exit(1);
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}
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System.err.println("PASS: Virtual memory usage increased by " + vMemDelta + "Kb " +
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"(not greater than " + MEM_LEAK_THRESHOLD + "Kb)");
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}
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System.exit(0);
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}
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/**
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* Return size of virtual memory allocated to the process in Kb.
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* Linux specific. On other platforms and in case of any errors return 0.
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*/
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private static long getVMemSize() {
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// Refer to the Linux proc(5) man page for details about /proc/self/stat file
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//
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// In short, this file contains status information about the current process
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// written in one line. The fields are separated with spaces.
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// The 23rd field is defined as 'vsize %lu Virtual memory size in bytes'
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try (FileReader fileReader = new FileReader("/proc/self/stat");
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BufferedReader bufferedReader = new BufferedReader(fileReader)) {
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String line = bufferedReader.readLine();
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return Long.parseLong(line.split(" ")[22]) / 1024;
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} catch (Exception ex) {}
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return 0;
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}
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}
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