Hi, Matthieu

My PEs are not I/O bound, but they do send out lots of events. My design requires one PN to deal with tens of thousands events per second.
These screen-shots are taken when not-too-many events are sent to the PEs. The PEC.workQueue soon reaches its max size, while CPU usage remains low. Thread 3 to Thread 8 denote the dequeuers; the linux kernel udp buffer is set to 80M. 

I just can't figure out where the problem is; is the RAM not fast enough?

1) CPU Usage
2) Threads
3) Hot spots

On Tue, Jan 3, 2012 at 2:21 AM, Matthieu Morel <mmorel@apache.org> wrote:
On 12/25/11 4:23 PM, Kurtt Lin wrote:
Hello, guys.

My S4 node is equipped with quad-core X3430 processors. What I noticed
is that, no matter how fast I send events to the node, the node's CPU
usage would not exceed 360%, even if the PEContainer.workQueue.size()
kept growing very fast. My question is, shouldn't the processors spare
more time to help PEContainer to consume the events? Why are they idle?
When I slowed down sending the events, I even monitored the CPU usage
drop to around 240%, and the PEContainer.workQueue.size() still keep
growing, though in a very low speed.

Could that be related to what your PEs are actually doing? is your application I/O bound? Are your PEs sending lots of events?

Also, you could try to profile the JVM to get more information.

Let us know!