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/*
* Copyright (c) 2002, 2016, 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 4369826 8078582 8190884
* @run main/othervm LotsOfOutput
* @summary Process with lots of output should not crash VM
* @author kladko
*/
public class LotsOfOutput {
static final Runtime runtime = Runtime.getRuntime();
// Allow memory to grow by up to 1Mb total
static final int THRESHOLD = 1048576;
// Compute used memory
static long usedMemory() {
return runtime.totalMemory() - runtime.freeMemory();
}
public static void main(String[] args) throws Exception {
if (! UnixCommands.isUnix) {
System.out.println("For UNIX only");
return;
}
UnixCommands.ensureCommandsAvailable("cat");
Process p = runtime.exec(UnixCommands.cat() + " /dev/zero");
long prev = usedMemory();
int growing = 0;
for (int i = 1; i < 10; i++) {
Thread.sleep(100);
long used = usedMemory();
if (used != prev) {
System.out.printf("consuming memory: i: %d, prev: %d, used: %d, delta: %d%n",
i, prev, used, used - prev);
}
if (used > prev + THRESHOLD)
growing += 1;
prev = used;
}
if (growing > 2)
throw new Exception("Process consumes memory: growing " + growing);
}
}
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