Calculating cpu utilization

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What I am trying to do is calculate cpu utilization from some unix servers. What I currently have is a perl service that pools the proc file system for the each cpu counter – constructs a hash and then send the values over to a web service to be stored in a sql database.

The hash looks like this

VirtualInstanceName CpuUptime CpuEUsedTime PoolTime
VCPU-0 5688754.556 2855479.579 01/01/2006 00:00:00
VCPU-0 5688756.357 2855489.654 01/01/2006 00:00:45
VCPU-0 5688765.261 2855502.325 01/01/2006 00:01:30
VCPU-0 5688804.387 2855643.875 01/01/2006 00:02:15
VCPU-0 5688906.618 2855902.184 01/01/2006 00:03:00

Each of these values are measured in milliseconds in which I need to calculate the cpu utilization in %

Anyone have any ideas

I have tried

For I as integer = 0 in m_cpucollection.length - 1
 
if CheckIfOddIndex(i) = true then
dim m_cpu as cpuclass = ctype(m_cpucollection(i), cpuclass)
dim m_cpu_delta as cpuclass = ctype(m_cpucollection(i -1), cpuclass)
 
dim rawtime as timespan = m_cpu_delta. PoolTime.subtract(m_cpu.PoolTime)
dim rawdelta as decimal = m_cpu_delta.CpuUptime - m_cpu.CpuUptime
dim rawspan as decimal = m_cpu_delta.CpuEUsedTime - m_cpu.CpuEusedtime
 
dim results as decimal = rawdelta – rawspan / rawtime * 100
end if
next

but I don’t think this is correct