Problems in Network Chart Generation

[Nilesh]

I am using jboss 4.2, java5.0 and RedHat 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, only that it is a lil slower. 

 

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();

       

 

 

    }

}




       
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