Power allocation among computing devices

A computer program product comprising computer readable storage media that is not a transitory signal having program instructions embodied therewith, the program instructions executable by a processor to:

• determine a current power capping amount for each of a plurality of computing devices;
• obtain a current power usage of each computing device;
• determine, for each computing device, an updated power capping amount based on whether or not the current power usage of the computing device has reached the current power capping amount of the computing device during a current period of time, wherein, for each computing device having a current power usage that hit the current power capping amount the greatest number of times among the plurality of computing device during the current time period, the updated power capping amount is determined to be an incremental increase above the current power capping amount of the computing device;
• allocate the updated power capping amount to the respective computing devices;
• and
• cause a power supply to deliver power to each computing device in an amount up to the updated power capping amount that has been allocated to the respective computing device.

A computer program product comprising computer readable storage media that is not a transitory signal having program instructions embodied therewith, the program instructions executable by a processor to:

• determine a current power capping amount for each of a plurality of computing devices;
• obtain a current power usage of each computing device;
• determine, for each computing device, an updated power capping amount based on whether or not the current power usage of the computing device has reached the current power capping amount of the computing device during a current period of time;
• allocate the updated power capping amount to the respective computing devices;
• and
• cause a power supply to deliver power to each computing device in an amount up to the updated power capping amount that has been allocated to the respective computing device, wherein the updated power capping amount for each of the plurality of computing devices is calculated according to the formula:
• P_allo=(P_node_his/P_total)*(P_avail−P_min*N_power_off)
• where:
• P_allo denotes the current power capping amount for allocating to a computing device;
• P_node_his denotes a power usage amount of the computing device in a most-recent past time frame or cycle;
• P_total denotes a total power usage amount of all of the computing devices in the most-recent past time frame or cycle;
• P_avail denotes a total available power amount of the power supply unit(s) in a current time frame;
• P_min denotes a minimum amount of power that each computing device needs to power on;
• and
• N_power_off denotes the number of computing devices in a power off state in the most-recent past time frame or cycle.