-none- 2007-10-09 - By Nilesh
Back
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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