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Hi,
I'm trying to use WMI to calculate cpu usage. I'm running the
following script into a W2K3 box. It works fine, but I had some doubts
about the values that I receive.
Reading MSDN (http://msdn2.microsoft.com/En-US/library/aa394271.aspx),
it tells that PercentProcessorTime "This property was designed as a
primary indicator of processor activity". Ok, but I want to break it
into user time and system time.
So, I think that I must use PercentUserTime, PercentPrivilegedTime and
PercentIdleTime. If I sum this 3 values, I should get 100%.
The problem is that almost never the sum is equals to 100. I
understand that we can have some round problems. But I was expecting
to see 99, 100 or 101. When the server is busy, often I receive 103.
If it isn't so busy, sometimes I receive 98...
Am I being grumpy?
Set objWMIService = GetObject("winmgmts:\\.\root\CIMV2")
Set colItems = objWMIService.ExecQuery("SELECT * FROM
Win32_PerfFormattedData_PerfOS_Processor WHERE name='_Total'", "WQL",
wbemFlagReturnImmediately + wbemFlagForwardOnly)
For Each objItem In colItems
WScript.Echo "PercentIdleTime: " & objItem.PercentIdleTime
WScript.Echo "PercentInterruptTime: " &
objItem.PercentInterruptTime
WScript.Echo "PercentPrivilegedTime: " &
objItem.PercentPrivilegedTime
WScript.Echo "PercentProcessorTime: " &
objItem.PercentProcessorTime
WScript.Echo "PercentUserTime: " & objItem.PercentUserTime
Next
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