How do I measure the CPU/GPU split of load/usage in Java3D?

Question

Hello,
Is it possible to measure the split between graphics and CPU usage to find out how much work each is doing, what work is done, and which is doing the most work, for example? If so, how can this be implemented in the Java3D code?
For example, on a particular system, measure whether the GPU is doing the most work, or the CPU.
Thanks for your help :)

Answer 1

In Linux, you can read /proc/uptime. It does NOT give you the load averages that the command uptime gives. It gives you numerically the amount of time the CPU was idle vs how much time it was spent doing something. You need to read these two floating point numbers one every second, or once every 5 or 10 seconds then do the delta on the change: The maths are as follows:
Read the file in twice in 5 seconds, parse into two floats/doubles:
double[] last;  // the first read of the file
double[] rect;  // the latest read of the file
double ld = last[1] - last[0];
double rd = rect[1] - rect[0];
double cpu = (1.0d-(rd/ld)) * 100.0d;This should print the CPU percentage in Linux for that given time frame (5 second updates).