BubbleChart & Performance

[fse]

hi,
i observed some strange performance differences between different charts.
bubblechart take 1 second per bubble and i am just measuring the writeBufferedImage.. method. the "same" set of data visualized with a combined stackedbar and lineandshapechart take 6% of that time. is there a turbo boost somewhere in the bubble chart?

tia frank

[david.gilbert]

I haven't done much in the way of performance measurement or optimisation in JFreeChart, so I'm not sure why it is slower. From a quick revision of the code, I can't see any obvious reasons why it would be that much slower...

[fse]

now my servertask crashes
with an out of memory error
between these log lines

Code: Select all

log.debug("...");
Date time = new Date();
ChartUtilities.writeBufferedImageAsPNG(out,getImage());
log.debug("time elapsed to write image "+(new Date().getTime()- time.getTime())+" millis");

i know, i try to isolate this behavior in a single class,
but may be there is a way to just stop this method to grab so much memory? :-)

cu
frank

ps:
shown in a window, it only take much time but doesn't crash.
but my target is the visualization with tomcat.
ok, i'll try to give tomcat more heapsize but that can only be a temporarily solution. now i have 40 bubbles what happens with 100? :-/

[fse]

hi david,

the problem is the size of the matrix i use with the bubble chart.
a 30 x 30 matrix reduces significant the time and i think memory needed
is there a way to store the matrix more efficient

cu
frank

waiting for a hint where to let his radar plot

I haven't done much in the way of performance measurement or optimisation in JFreeChart, so I'm not sure why it is slower. From a quick revision of the code, I can't see any obvious reasons why it would be that much slower...

[david.gilbert]

To be honest I've not looked closely at that code. Fortunately, the XYBubbleRenderer only requires data from an XYZDataset (an interface), so you can replace the dataset implementation with your own class(es).