We have a VM that vCenter is showing at 100% CPU ute. The VM has 6gb of memory, 1 socket/2cores. At irregular intervals, the PU spikes and stays at 100% for nearly 5hrs. No consistent time of day.
Using ESXTOP durng occassions when this happens, I don't see anything out of the norm. In fact, I see the exact opposite. Both PCPU and VCPU stat's show normal. From inside the VM with Resource Monitor I see that the CPU load is high also. Memory is not affected and neither is disk activity. There are few applications running on this server (it is Windows 2003) but the one that runs the most is an application that uses a PDF to Tiff conversion tool. This can be run anytime a user needs it and it is used every day and often several times during day.