Migrating virtual machines among computer systems to balance load caused by virtual machines

A method comprising:

• scheduling one or more virtual machines for execution on hardware comprising a first computer system of a plurality of computer systems;
• the first computer system detecting that the first computer system has a first load that exceeds a second load of a second computer system of the plurality of computer systems;
• and
• the first computer system migrating at least a first virtual machine executing on the first computer system to a second computer system of the plurality of computer systems responsive to the detecting, and wherein the first virtual machine has a corresponding load that is nearest, among the virtual machines executing on the first computer system, to ½ the difference between the first load and the second load.

A computer accessible medium encoded with a plurality of instructions that, when executed on a first computer system:

• calculate a first load on the first computer system from one or more load factors, wherein the first load corresponds to a first virtual machine, and wherein the first virtual machine is one of one or more virtual machines to be scheduled for execution on the first computer system;
• transmit the one or more load factors from the first computer system to a second computer system, wherein the second computer system is configured to calculate a second load on the second computer system from the one or more load factors, wherein the second load corresponds to the first virtual machine, and wherein the first load differs from the second load;
• and
• migrate the first virtual machine to the second computer system to be executed on the second computer system responsive to a first total load of the first computer system exceeding a second total load of the second computer system, and wherein the first virtual machine has a corresponding load that is nearest, among loads of the virtual machines executing on the first computer system, to ½ the difference between the first total load and the second total load.