Any way to get CPU-seconds for process or a thread from within my app?

I'm trying to guage the work by different processes within our application. I'd like to be able to get the number of CPU-seconds before a long task and then again after the task finishes and compute the difference. I'm sure I could poll the % CPU every second and try estimate the value, but I don't think it would be very accurate.
Is there a MBean or some other way to access the CPU-seconds for the process?
It would even be better if I could get this at the thread level (which seems possible since JRA recordings can show the 'running' time on a graph drawn in milliseconds).
Thanks
-Bill

We are considering making this available through a MBean in our upcoming R28 release.Do you have a program I can participate in to get beta or pre-releases of new JRockit versions? The purpose would be to do preliminary performance testing so we can get official releases to our development team more quickly once they are formally released.
I'm also hoping to find cumulative disk i/o bytes and cumulative network i/o bytes on a thread or even at the JVM levelI don't think we have that in JRockit today... What would you use it for?The use would be for performance monitoring. In a large system or a busy system, the effect of code changes can be hard to measure just based on clock time or traditional measurements like % CPU or bytes/sec at a specific instant. Knowing how much 'work' is getting done (together with the clock time) gives a better picture.
I like cumulative numbers like cpu-sec and # of bytes because I only need two measures (before and after) instead of continuous polling and summing. Some of my processes get created on their own threads, so I could potentially get these measures of work on my customer's production systems with a lot of other activity going on. By comparing samples over time, we can tell if processes are running longer due to 'more work' or due to resource bottlenecks.
I think it could be useful on shared threads too even though i don't know yet if I can see which threads specific requests are using.
-Bill

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