Max CPU load in *nix

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http://serverfault.com – I am running an Ubuntu 12.04 server via a virtual machine (it is running on vmware's ESXi hypervisor) but I am not convinced it has full access to the 8 CPUs that I have assigned to it. My physical server has 2 phyiscal chips with 4 physical cores. I assigned this same configuration to my virtual server. Unfortunately I have never seen any single process get above 12.5% CPU load and I am thinking there might be an issue with my config. TL:DR - What is the easiest way to max my CPU usage via CLI for testing purposes? (HowTos)