Re: [Hyperic-hq-discuss] Invalid cpu usage per process

[JeanDagenais2 <sig...@hy...>]

Hello,

I modified your code slighlty to get these results:

ProcCpu procCPU = sigar.getProcCpu(pid); -> Main Change
ProcState procState = sigar.getProcState(pid);
ProcTime procTime = sigar.getProcTime(pid);

String processName = procState.getName();
String cpuPercentage = CpuPerc.format(procCPU.getPercent());
totalProcessTime = procTime.getTotal();

System.out.println(pid + "\t\t" + processName + "\t\t" + cpuPercentage + "\t\t" + totalProcessTime);

This is run with a 1000 ms interval between sampling (which is quite short based on the accuracy of windows, e.g. ~ 15 ms for sampling CPU busy).

6148		javaw		0.0%		351240
6148		javaw		43.3%		351694
6148		javaw		0.0%		351694
6148		javaw		1.5%		351709
6148		javaw		0.0%		351709
6148		javaw		1.6%		351725
6148		javaw		0.0%		351725
6148		javaw		4.7%		351772
6148		javaw		0.0%		351772
6148		javaw		0.0%		351772
6148		javaw		0.0%		351772

This is on Windows XP, and you need to remember that Windows has an accuracy of about 15 milliseconds for this counter, which mean it's not too accurate at low utilization. It is better on Linux and Solaris.

I added  the procTime.getTotal() which gives you an idea of what is really measured and then interpreted as %.

Hope this help!
Jean