On 05.07.2014 19:44, Restituto Marcus Arevalo wrote: The virt-manager source code can be found here: https://git.fedorahosted.org/git/virt-manager.git To check it out use: git clone git://git.fedorahosted.org/git/virt-manager.git virt-manager.git The CPU usage of a domain is queried using virDomainGetInfo. The CPU usage is then calculated as (in a crippled C): while (1) { time1 = now(); virDomainGetInfo(dom, &info); cpu1 = info.cpuTime; sleep(500); // sleep some time time2 = now(); virDomainGetInfo(dom, &info); cpu2 = info.cpuTime; cpuUsagePercent = (cpu2 - cpu1) / (time2 - time1) * 100; } Michal