Demo code which plots the memory usage by all memory pools
/*
* @(#)MemoryMonitor.java 1.3 05/11/17
*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* -Redistribution of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* -Redistribution in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
* AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
* REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
* INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
* OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
* EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed, licensed or intended
* for use in the design, construction, operation or maintenance of any
* nuclear facility.
*/
/*
* @(#)MemoryMonitor.java 1.3 05/11/17
*/
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryPoolMXBean;
import java.util.Date;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;
/**
* Demo code which plots the memory usage by all memory pools. The memory usage
* is sampled at some time interval using java.lang.management API. This demo
* code is modified based java2d MemoryMonitor demo.
*/
public class MemoryMonitor extends JPanel {
static JCheckBox dateStampCB = new JCheckBox("Output Date Stamp");
public Surface surf;
JPanel controls;
boolean doControls;
JTextField tf;
// Get memory pools.
static java.util.List<MemoryPoolMXBean> mpools = ManagementFactory.getMemoryPoolMXBeans();
// Total number of memory pools.
static int numPools = mpools.size();
public MemoryMonitor() {
setLayout(new BorderLayout());
setBorder(new TitledBorder(new EtchedBorder(), "Memory Monitor"));
add(surf = new Surface());
controls = new JPanel();
controls.setPreferredSize(new Dimension(135, 80));
Font font = new Font("serif", Font.PLAIN, 10);
JLabel label = new JLabel("Sample Rate");
label.setFont(font);
label.setForeground(Color.red);
controls.add(label);
tf = new JTextField("1000");
tf.setPreferredSize(new Dimension(45, 20));
controls.add(tf);
controls.add(label = new JLabel("ms"));
label.setFont(font);
label.setForeground(Color.red);
controls.add(dateStampCB);
dateStampCB.setFont(font);
addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
removeAll();
if ((doControls = !doControls)) {
surf.stop();
add(controls);
} else {
try {
surf.sleepAmount = Long.parseLong(tf.getText().trim());
} catch (Exception ex) {
}
surf.start();
add(surf);
}
validate();
repaint();
}
});
}
public class Surface extends JPanel implements Runnable {
public Thread thread;
public long sleepAmount = 1000;
public int usageHistCount = 20000;
private int w, h;
private BufferedImage bimg;
private Graphics2D big;
private Font font = new Font("Times New Roman", Font.PLAIN, 11);
private int columnInc;
private float usedMem[][];
private int ptNum[];
private int ascent, descent;
private Rectangle graphOutlineRect = new Rectangle();
private Rectangle2D mfRect = new Rectangle2D.Float();
private Rectangle2D muRect = new Rectangle2D.Float();
private Line2D graphLine = new Line2D.Float();
private Color graphColor = new Color(46, 139, 87);
private Color mfColor = new Color(0, 100, 0);
private String usedStr;
public Surface() {
setBackground(Color.black);
addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (thread == null)
start();
else
stop();
}
});
int i = 0;
usedMem = new float[numPools][];
ptNum = new int[numPools];
}
public Dimension getMinimumSize() {
return getPreferredSize();
}
public Dimension getMaximumSize() {
return getPreferredSize();
}
public Dimension getPreferredSize() {
return new Dimension(135, 80);
}
public void paint(Graphics g) {
if (big == null) {
return;
}
big.setBackground(getBackground());
big.clearRect(0, 0, w, h);
h = h / ((numPools + numPools % 2) / 2);
w = w / 2;
int k = 0; // index of memory pool.
for (int i = 0; i < 2; i++) {
for (int j = 0; j < (numPools + numPools % 2) / 2; j++) {
plotMemoryUsage(w * i, h * j, w, h, k);
if (++k >= numPools) {
i = 3;
j = (numPools + numPools % 2) / 2;
break;
}
}
}
g.drawImage(bimg, 0, 0, this);
}
public void plotMemoryUsage(int x1, int y1, int x2, int y2, int npool) {
MemoryPoolMXBean mp = mpools.get(npool);
float usedMemory = mp.getUsage().getUsed();
float totalMemory = mp.getUsage().getMax();
// .. Draw allocated and used strings ..
big.setColor(Color.green);
// Print Max memory allocated for this memory pool.
big.drawString(String.valueOf((int) totalMemory / 1024) + "K Max ", x1 + 4.0f, (float) y1
+ ascent + 0.5f);
big.setColor(Color.yellow);
// Print the memory pool name.
big.drawString(mp.getName(), x1 + x2 / 2, (float) y1 + ascent + 0.5f);
// Print the memory used by this memory pool.
usedStr = String.valueOf((int) usedMemory / 1024) + "K used";
big.setColor(Color.green);
big.drawString(usedStr, x1 + 4, y1 + y2 - descent);
// Calculate remaining size
float ssH = ascent + descent;
float remainingHeight = (float) (y2 - (ssH * 2) - 0.5f);
float blockHeight = remainingHeight / 10;
float blockWidth = 20.0f;
float remainingWidth = (float) (x2 - blockWidth - 10);
// .. Memory Free ..
big.setColor(mfColor);
int MemUsage = (int) (((totalMemory - usedMemory) / totalMemory) * 10);
int i = 0;
for (; i < MemUsage; i++) {
mfRect.setRect(x1 + 5, (float) y1 + ssH + i * blockHeight, blockWidth,
(float) blockHeight - 1);
big.fill(mfRect);
}
// .. Memory Used ..
big.setColor(Color.green);
for (; i < 10; i++) {
muRect.setRect(x1 + 5, (float) y1 + ssH + i * blockHeight, blockWidth,
(float) blockHeight - 1);
big.fill(muRect);
}
// .. Draw History Graph ..
if (remainingWidth <= 30)
remainingWidth = (float) 30;
if (remainingHeight <= ssH)
remainingHeight = (float) ssH;
big.setColor(graphColor);
int graphX = x1 + 30;
int graphY = y1 + (int) ssH;
int graphW = (int) remainingWidth;
int graphH = (int) remainingHeight;
graphOutlineRect.setRect(graphX, graphY, graphW, graphH);
big.draw(graphOutlineRect);
int graphRow = graphH / 10;
// .. Draw row ..
for (int j = graphY; j <= graphH + graphY; j += graphRow) {
graphLine.setLine(graphX, j, graphX + graphW, j);
big.draw(graphLine);
}
// .. Draw animated column movement ..
int graphColumn = graphW / 15;
if (columnInc == 0) {
columnInc = graphColumn;
}
for (int j = graphX + columnInc; j < graphW + graphX; j += graphColumn) {
graphLine.setLine(j, graphY, j, graphY + graphH);
big.draw(graphLine);
}
--columnInc;
// Plot memory usage by this memory pool.
if (usedMem[npool] == null) {
usedMem[npool] = new float[usageHistCount];
ptNum[npool] = 0;
}
// save memory usage history.
usedMem[npool][ptNum[npool]] = usedMemory;
big.setColor(Color.yellow);
int w1; // width of memory usage history.
if (ptNum[npool] > graphW) {
w1 = graphW;
} else {
w1 = ptNum[npool];
}
for (int j = graphX + graphW - w1, k = ptNum[npool] - w1; k < ptNum[npool]; k++, j++) {
if (k != 0) {
if (usedMem[npool][k] != usedMem[npool][k - 1]) {
int h1 = (int) (graphY + graphH * ((totalMemory - usedMem[npool][k - 1]) / totalMemory));
int h2 = (int) (graphY + graphH * ((totalMemory - usedMem[npool][k]) / totalMemory));
big.drawLine(j - 1, h1, j, h2);
} else {
int h1 = (int) (graphY + graphH * ((totalMemory - usedMem[npool][k]) / totalMemory));
big.fillRect(j, h1, 1, 1);
}
}
}
if (ptNum[npool] + 2 == usedMem[npool].length) {
// throw out oldest point
for (int j = 1; j < ptNum[npool]; j++) {
usedMem[npool][j - 1] = usedMem[npool][j];
}
--ptNum[npool];
} else {
ptNum[npool]++;
}
}
public void start() {
thread = new Thread(this);
thread.setPriority(Thread.MIN_PRIORITY);
thread.setName("MemoryMonitor");
thread.start();
}
public synchronized void stop() {
thread = null;
notify();
}
public void run() {
Thread me = Thread.currentThread();
while (thread == me && !isShowing() || getSize().width == 0) {
try {
thread.sleep(500);
} catch (InterruptedException e) {
return;
}
}
while (thread == me && isShowing()) {
Dimension d = getSize();
if (d.width != w || d.height != h) {
w = d.width;
h = d.height;
bimg = (BufferedImage) createImage(w, h);
big = bimg.createGraphics();
big.setFont(font);
FontMetrics fm = big.getFontMetrics(font);
ascent = (int) fm.getAscent();
descent = (int) fm.getDescent();
}
repaint();
try {
thread.sleep(sleepAmount);
} catch (InterruptedException e) {
break;
}
if (MemoryMonitor.dateStampCB.isSelected()) {
System.out.println(new Date().toString() + " " + usedStr);
}
}
thread = null;
}
}
// Test thread to consume memory
static class Memeater extends ClassLoader implements Runnable {
Object y[];
public Memeater() {
}
public void run() {
y = new Object[10000000];
int k = 0;
while (true) {
if (k == 5000000)
k = 0;
y[k++] = new Object();
try {
Thread.sleep(20);
} catch (Exception x) {
}
// to consume perm gen storage
try {
// the classes are small so we load 10 at a time
for (int i = 0; i < 10; i++) {
loadNext();
}
} catch (ClassNotFoundException x) {
// ignore exception
}
}
}
Class loadNext() throws ClassNotFoundException {
// public class TestNNNNNN extends java.lang.Object{
// public TestNNNNNN();
// Code:
// 0: aload_0
// 1: invokespecial #1; //Method java/lang/Object."<init>":()V
// 4: return
// }
int begin[] = { 0xca, 0xfe, 0xba, 0xbe, 0x00, 0x00, 0x00, 0x30, 0x00, 0x0a, 0x0a, 0x00, 0x03,
0x00, 0x07, 0x07, 0x00, 0x08, 0x07, 0x00, 0x09, 0x01, 0x00, 0x06, 0x3c, 0x69, 0x6e, 0x69,
0x74, 0x3e, 0x01, 0x00, 0x03, 0x28, 0x29, 0x56, 0x01, 0x00, 0x04, 0x43, 0x6f, 0x64, 0x65,
0x0c, 0x00, 0x04, 0x00, 0x05, 0x01, 0x00, 0x0a, 0x54, 0x65, 0x73, 0x74 };
int end[] = { 0x01, 0x00, 0x10, 0x6a, 0x61, 0x76, 0x61, 0x2f, 0x6c, 0x61, 0x6e, 0x67, 0x2f,
0x4f, 0x62, 0x6a, 0x65, 0x63, 0x74, 0x00, 0x21, 0x00, 0x02, 0x00, 0x03, 0x00, 0x00, 0x00,
0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x04, 0x00, 0x05, 0x00, 0x01, 0x00, 0x06, 0x00, 0x00,
0x00, 0x11, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x05, 0x2a, 0xb7, 0x00, 0x01, 0xb1,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
// TestNNNNNN
String name = "Test" + Integer.toString(count++);
byte value[];
try {
value = name.substring(4).getBytes("UTF-8");
} catch (java.io.UnsupportedEncodingException x) {
throw new Error();
}
// construct class file
int len = begin.length + value.length + end.length;
byte b[] = new byte[len];
int i, pos = 0;
for (i = 0; i < begin.length; i++) {
b[pos++] = (byte) begin[i];
}
for (i = 0; i < value.length; i++) {
b[pos++] = value[i];
}
for (i = 0; i < end.length; i++) {
b[pos++] = (byte) end[i];
}
return defineClass(name, b, 0, b.length);
}
static int count = 100000;
}
public static void main(String s[]) {
final MemoryMonitor demo = new MemoryMonitor();
WindowListener l = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
public void windowDeiconified(WindowEvent e) {
demo.surf.start();
}
public void windowIconified(WindowEvent e) {
demo.surf.stop();
}
};
JFrame f = new JFrame("MemoryMonitor");
f.addWindowListener(l);
f.getContentPane().add("Center", demo);
f.pack();
f.setSize(new Dimension(400, 500));
f.setVisible(true);
demo.surf.start();
Thread thr = new Thread(new Memeater());
thr.start();
}
}
Related examples in the same category
