I am using jboss 4.2, java5.0 and Fedora Linux Enterprise Version 4.0 with

Question

Hi,
I am using jboss 4.2, java5.0 and Fedora Linux Enterprise Version 4.0 with kernel 2.6 and NPTL 2.3.4
I am using open source network chart generation API provided by geosoft ( http://geosoft.no/graphics/). This API generates chart into swing window.
I wrote the code to change this swing window into web browser compatible jpeg image. I used thread to generate the image. It is working fine, for one user and no other processes running on the application.
ISSUE:- When more than 5 users hit the application at the same time, some images get generated, some donot, there is no fixed trend to this image generation process.
I analyzed CPU timing, it is using 100% CPU and after the images are generated / not generated, the CU usage goes down to zero.
When I used the same code with Linux 9.0 (kernel 2.4, NPTL � 0.6), rest remain the same, it is working perfectly fine with more than 10 users, with all images being generated within 30 secs
Can somebody help me out to figure out whether it is a kernel issue / NPTL issue? Does it have something to do with thread processing?
Code for network chart generation :-
NetworkGenerator ntw=new NetworkGenerator();
BufferedImage img;
ntw.setVectRootNodes(vectRootNodes);
ntw.setHashChildNodeNames(hashNodeData);
ntw.setHashNodeRelation(hashNodeRelation);
ntw.setHashNodesCreated(hashNodesCreated);
ntw.setSupplyChainBean(supplyChainBean);
Thread t=new Thread(ntw);
t.setPriority(Thread.MAX_PRIORITY);
t.start();
try{
t.join();
catch(Exception e)
DebugManager.doDebug(className.toString(),e);
if(t!=null)
System.out.println(t.getState().name());
System.out.println(t.isAlive());
public class NetworkGenerator extends JFrame implements Runnable{
public void run()
//call the garbage collector
System.gc();
// Create the graphic canvas
window = new no.geosoft.cc.graphics.GWindow();
window.getCanvas().setSize(screenWidth,screenHt );
// Create the GUI
JPanel topLevel = new JPanel();
topLevel.setBackground(new Color(255,255,255)) ;
topLevel.setLayout (new BorderLayout());
getContentPane().add (topLevel);
topLevel.add (window.getCanvas(), BorderLayout.CENTER);
topLevel.setVisible(true);
// Create scene with default viewport
scene = new no.geosoft.cc.graphics.GScene(window, "My Scene"+ (new Date().getTime()));
no.geosoft.cc.graphics.GStyle style = new no.geosoft.cc.graphics.GStyle();
style.setForegroundColor (new Color (0, 0, 0));
style.setBackgroundColor (new Color (255, 255, 255));
style.setFont (new Font ("Arial", Font.BOLD, 10));
scene.setStyle (style);
int xPos=minY ;
int yPos=0;
int noofChild=vectRootNodes.size();
int dev=(screenHt -minY )/(noofChild+1);
int newDev=Math.round(dev-(dev/5));
//log.debug("---------noofChild-----------------------------------"+noofChild);
if(!hashNodesCreated.isEmpty())
for(int i=0;i<noofChild;i++)
yPos=minY +(dev*(i+1));
String nodeName = vectRootNodes.get(i).toString();
log.debug("root nodename===="+nodeName+" with ypos :"+yPos);
//log.debug("nodeName=="+nodeName);
//create root nodes
Node rootNode = createChildNode( nodeName,minY,screenHt,xPos, yPos ,newDev,1);
scene.add(rootNode);
log.debug("screenWidth ===="+screenWidth );
// if(screenWidth>minExtXval)
// minExtXval = screenWidth;
// w2 o
// * |
// * |
// * |
// * w0 o-------o w1
double w0[] = {0.0,screenHt ,0.0};
double w1[] = {screenWidth,screenHt,0.0};
double w2[] = {0.0,0.0,0.0};
scene.setWorldExtent (w0, w1, w2);
this.pack();
Thanks in advance.

Answer 1

How do I do that as I checked for it in utilities and is not there? Thanks in advance