100% CPU usage problem

[cassidyh]

HI,
I am trying to continuously update 4 XYBarcharts within a panel, but as soon as I start the plotting, my CPU usage jumps to 100%. AM I overlooking something?Anyone with any suggestions, I would appreciate any help
Cassidy

[rickbier]

I found the same thing in using the plotting package. I found it best to lower the priority of the program doing the plotting so other tasks could get some CPU time.

[cassidyh]

Hi
I found the bug that caused my bottleneck. I was processing all data in my incoming, including 0s. SO everytime I added data to my series, I also added zeros. Once I put in a simple if(data!=0){ series.add(data)} all my problems have also disappeared. You might want to also check for something so simple as that for getting CPU performance up.
Cass

[david.gilbert]

If you are adding multiple new values to a dataset, be aware that each 'add' will trigger a DatasetChangeEvent and repaint the chart. You can avoid that by using this approach:

Code: Select all

chart.setNotify(false);
// do multiple dataset updates here
chart.setNotify(true);

The same applies to any other changes you make to the chart, plot(s), axes, renderers, titles etc.

[rickbier]

Taking a hint from another post to your message, I found that when adding points to a series (which I do before creating the chart), the following speeds things up by a factor of 4:

XYSeries s1 = new XYSeries(...);
s1.setNotify(false);
add all points to the series
s1.setNotify(true);

[cassidyh]

Thanks a lot,
I tried the setnotify, and it seems to be working fine. I also had to make sure to call the series.clear() before updating the chart