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(); } } ____________________________________________________________________________________ Boardwalk for $500? In 2007? Ha! Play Monopoly Here and Now (it's updated for today's economy) at Yahoo! Games. http://get.games.yahoo.com/proddesc?gamekey=monopolyherenow -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
