1. A system, comprising: a plurality of non-uniform memory access (NUMA) nodes each having a set of computing resources that includes CPU cores with associated memory and I/O resources; program instructions stored in a memory of said system for programming a processor in said system to perform operations for determining NUMA node placement fitness for virtual machine partitions that can be provisioned on said NUMA nodes with each virtual machine partition occupying one or more of said NUMA nodes, said virtual machine partitions being managed under a hypervisor in said system and each comprising a set of computing resources that include processor, memory and I/O resources, said operations comprising: receiving from a partition score requester a partition resource specification identifying a set of computing resources, including processor, memory and I/O resources, needed for a virtual machine partition to be created by a hypervisor in said host computing system, said partition score requester being a resource manager agent that provisions virtual resources in response to resource requests from customer devices; assessing resource availability within said NUMA nodes to determine possible partition placement options representing one or more NUMA nodes where said virtual machine partition with said needed computing resources could be provisioned; calculating a partition fitness score of a most suitable one or more NUMA nodes representing one of said partition placement options; said partition fitness score reflecting an ability of said hypervisor to provision said needed computing resources within a single one of said NUMA nodes; and reporting said partition fitness score to said partition score requester.