Better Performance: WMI vs SNMP?

What has better performance under Windows for retrieving stats开发者_运维百科 like CPU/Memory/Disk usage, etc.? WMI or SNMP?

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Check this paper by Berry Hoekstra:

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A paper I wrote about the differences of SNMP and WMI. I discuss both monitoring standards and conclude if WMI is really necessary in a world where SNMP is king.