CPU resources and sharing

On each hardware node, there are 2 quad-core CPUs, amounting to a total of 8 CPU cores.  Each hardware node has approx 30 VPSs on it.  The Xen hypervisor (virtualization layer) equally shares the CPU cores between all VPSs, giving each a priority based on its RAM.  So, a VPS with 512MB RAM has twice the CPU priority than a 256MB RAM VPS.  Under normal circumstances, CPU usage is low across all of the VPSs on the node (considering there are 8 total cores) and the CPU limits are not noticed.

Overall, a VPS with more RAM has more CPU priority.

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