1. A computer system comprising: first and second partitions, said second partition having at least one available computing resource for reallocation to said first partition; a pay-per-use (PPU) system to provide PPU computing resources for use in said computer system on a chargeable basis; and a resource management system to: in response to a request for a computing resource from the first partition, determine whether the PPU system has a PPU computing resource available for use in the first partition, in response to a determination that the PPU system has a PPU computing resource available for use in the first partition, allocate the PPU computing resource to the first partition before deleting a corresponding computing resource from the second partition, and in response to a determination that the PPU system does not have a PPU computing resource available for use in the first partition, delete the corresponding computing resource from the second partition before allocating the deleted corresponding computing resource from the second partition to the first partition.