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/*
* Copyright (c) 2003, 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 4530538
* @summary Basic unit test of MemoryMXBean.getMemoryPools() and
* MemoryMXBean.getMemoryManager().
* @requires vm.gc != "Z"
* @author Mandy Chung
*
* @modules jdk.management
* @run main MemoryTest 2 3
*/
/*
* NOTE: This expected result is hardcoded in this test and this test
* will be affected if the heap memory layout is changed in
* the future implementation.
*/
import java.lang.management.*;
import java.util.*;
public class MemoryTest {
private static boolean testFailed = false;
private static MemoryMXBean mm = ManagementFactory.getMemoryMXBean();
private static final int HEAP = 0;
private static final int NONHEAP = 1;
private static final int NUM_TYPES = 2;
// WARNING: if the number of pools changes in the future,
// this test needs to be modified to handle different version of VMs.
// Hotspot VM 1.5 expected to have
// heap memory pools = 3 (Eden, Survivor spaces, Old gen)
// non-heap memory pools = 2 (Perm gen, Code cache)
// or 4 if Class Sharing is enabled.
// Number of memory managers = 3
// They are: Copy/Scavenger + MSC + CodeCache manager
// (or equivalent for other collectors)
// Number of GC memory managers = 2
// Hotspot VM 1.8+ after perm gen removal is expected to have between two
// or five non-heap memory pools:
// - Code cache (between one and three depending on the -XX:SegmentedCodeCache option)
// - Metaspace
// - Compressed Class Space (if compressed class pointers are used)
private static int[] expectedMinNumPools = new int[2];
private static int[] expectedMaxNumPools = new int[2];
private static int expectedNumGCMgrs;
private static int expectedNumMgrs;
private static String[] types = { "heap", "non-heap" };
public static void main(String args[]) throws Exception {
expectedNumGCMgrs = Integer.valueOf(args[0]);
expectedNumMgrs = expectedNumGCMgrs + 2;
int expectedNumPools = Integer.valueOf(args[1]);
expectedMinNumPools[HEAP] = expectedNumPools;
expectedMaxNumPools[HEAP] = expectedNumPools;
expectedMinNumPools[NONHEAP] = 2;
expectedMaxNumPools[NONHEAP] = 5;
checkMemoryPools();
checkMemoryManagers();
if (testFailed)
throw new RuntimeException("TEST FAILED.");
System.out.println("Test passed.");
}
private static void checkMemoryPools() throws Exception {
List pools = ManagementFactory.getMemoryPoolMXBeans();
boolean hasPerm = false;
int[] numPools = new int[NUM_TYPES];
for (ListIterator iter = pools.listIterator(); iter.hasNext();) {
MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
if (pool.getType() == MemoryType.HEAP) {
numPools[HEAP]++;
}
if (pool.getType() == MemoryType.NON_HEAP) {
numPools[NONHEAP]++;
}
if (pool.getName().toLowerCase().contains("perm")) {
hasPerm = true;
}
}
if (hasPerm) {
// If the VM has perm gen there will be between 2 and 4 non heap
// pools (4 if class data sharing is used)
expectedMinNumPools[NONHEAP] = 2;
expectedMaxNumPools[NONHEAP] = 4;
}
// Check the number of Memory pools
for (int i = 0; i < NUM_TYPES; i++) {
if (numPools[i] < expectedMinNumPools[i] ||
numPools[i] > expectedMaxNumPools[i]) {
throw new RuntimeException("TEST FAILED: " +
"Number of " + types[i] + " pools = " + numPools[i] +
" but expected <= " + expectedMaxNumPools[i] +
" and >= " + expectedMinNumPools[i]);
}
}
}
private static void checkMemoryManagers() throws Exception {
List mgrs = ManagementFactory.getMemoryManagerMXBeans();
int numGCMgr = 0;
// Check the number of Memory Managers
for (ListIterator iter = mgrs.listIterator(); iter.hasNext();) {
MemoryManagerMXBean mgr = (MemoryManagerMXBean) iter.next();
String[] poolNames = mgr.getMemoryPoolNames();
if (poolNames == null || poolNames.length == 0) {
throw new RuntimeException("TEST FAILED: " +
"Expected to have one or more pools for " +
mgr.getName() + "manager.");
}
if (mgr instanceof GarbageCollectorMXBean) {
numGCMgr++;
} else {
for (int i = 0; i < poolNames.length; i++) {
checkPoolType(poolNames[i], MemoryType.NON_HEAP);
}
}
}
if (mgrs.size() != expectedNumMgrs) {
throw new RuntimeException("TEST FAILED: " +
"Number of memory managers = " + mgrs.size() +
" but expected = " + expectedNumMgrs);
}
if (numGCMgr != expectedNumGCMgrs) {
throw new RuntimeException("TEST FAILED: " +
"Number of GC managers = " + numGCMgr + " but expected = " +
expectedNumGCMgrs);
}
}
private static List pools = ManagementFactory.getMemoryPoolMXBeans();
private static void checkPoolType(String name, MemoryType type)
throws Exception {
for (ListIterator iter = pools.listIterator(); iter.hasNext(); ) {
MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
if (pool.getName().equals(name)) {
if (pool.getType() != type) {
throw new RuntimeException("TEST FAILED: " +
"Pool " + pool.getName() + " is of type " +
pool.getType() + " but expected to be " + type);
} else {
return;
}
}
}
throw new RuntimeException("TEST FAILED: " +
"Pool " + name + " is of type " + type +
" not found");
}
}
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