1. A method of operating a resource management node comprising: performing operations as follows on a processor of a resource management node: for each of a plurality of guest virtual machines (VMs), determining operational resources of physical host machines available in a distributed computing system that are needed to provide the guest VM; generating a placement scenario for placing the guest VMs on the physical host machines and placing the physical host machines in cabinets of a distributed computing system; determining an amount of infrastructure of the distributed computing system used by the placement scenario, by operations comprising: determining an infrastructure value based on measuring electrical power consumption by the physical host machines of the placement scenario while the physical host machines are operating in cabinets of the distributed computer system processing a cluster of the guest VMs identified by a defined resource loading scenario of the placement scenario; determining a productivity metric for each of the guest VMs of the placement scenario that is measured over a time period having a duration that is adjusted based on an elapsed time between a start-up of one the physical host machines and the one of the physical host machines being ready to process the guest VM, wherein the time period over which the productivity metric is measured increases as the elapsed time increases between the start-up of one the physical host machines and the one of the physical host machines being ready to process the guest VM, and wherein the productivity metric is determined based on loading of a processor of the physical host machine by the guest VM; and proportionally attributing the infrastructure value to each of the guest VMs in the cluster of the guest VMs of the placement scenario based on the relative amounts of the productivity metrics for the guest VMs of the placement scenario; determining whether the placement scenario satisfies a defined rule for how much infrastructure of the distributed computing system can be used; and initiating placement of the physical host machines in the cabinets and placement of the guest VMs on the physical host machines based on the placement scenario satisfying the defined rule, by operations comprising loading the guest VMs to memories of the physical host machines and initiating processing of the guest VMs by processors of the physical host machines.