Estimating virtual machine energy consumption

A method comprising:

• a computer system obtaining system energy consumption of system hardware resources;
• the computer system obtaining event information of a plurality of functional units into which the system hardware resources are divided, and mapping the event information to respective virtual machines;
• and
• the computer system calculating energy consumption of the virtual machines according to a plurality of energy consumption coefficients corresponding to the plurality of functional units and according to the mapped event information, wherein the calculating energy consumption of the virtual machines comprises:
• obtaining energy consumptions of the respective functional units in the system hardware resources according to predetermined energy consumption weights, the energy consumption weights being proportions of the energy consumptions of the respective functional units to the system energy consumption;
• determining the energy consumption coefficients by equally sharing the energy consumptions of the respective functional units according to a total amount of events obtained from the event information statistics of the functional units of the system hardware resources;
• calculating energy consumptions of the respective functional units of the respective virtual machines by multiplication according to the mapped event information and the energy consumption coefficients;
• and
• estimating energy consumptions of the respective virtual machines by adding up the energy consumptions of the functional units in the respective virtual machines.