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The Intel Power Gadget

Intel has implemented a Running Average Power Limit (RAPL) on Sandybridge processors.

A number of machine-specific registers are defined containing energy information: 

SandyBridge:
    MSR_RAPL_POWER_UNIT  MSR_PKG_POWER_LIMIT   MSR_PKG_ENERGY_STATUS  MSR_PP0_POLICY 
    MSR_PP0_PERF_STATUS  MSR_PKG_POWER_INFO   MSR_PP0_POWER_LIMIT   MSR_PP0_ENERGY_STATUS
»Measuring Energy Consumption for Short Code Paths Using RAPL. Hähnel 2012


Intel's Power Gadget

Screenshot: LikwidPower gives Energy Use from Intel's Power Gadget
33: (C) 2012-15, DJ Greaves, University of Cambridge, Computer Laboratory.