Maximizing server utilization within a datacenter

A system for collocating workloads in a datacenter, comprising:

• a number of servers communicatively coupled to each other;
• and
• a collocation module that:
• receives information from a number of virtual machines operating on each server describing utility metrics describing the performance of each virtual machine;
• and
• determines whether to migrate one of the number of virtual machines to another server based on the utility metrics.

A computer program product for maximizing datacenter efficiency, the computer program product comprising:

• a computer readable storage medium comprising computer usable program code embodied therewith, the computer usable program code that, when executed by a processor:
• detects resource consumption among a number of workloads processed on a number of virtual machines operating on a plurality of servers within a datacenter;
• determine which of the number of workloads are non-critical and critical workloads;
• assign and migrate a number of the virtual machines operating the non-critical and critical workloads to a number of servers within the plurality of servers less than the total number of servers;
• isolating any virtual machines processing critical workloads from any virtual machines processing non-critical workloads by virtual CPU confinement and, upon violation of an SLA associated with any critical workload, executing a SISGSTOP command such that any non-critical workload is paused until additional resources are available;
• and
• stop use of any resources within any server not assigned a virtual machine.