Now consuming 37.6% memory debian7 (libvirtd process with virt-manager connected for 44 hours) PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1761 root 20 0 3321m 2.9g 5504 S 9.9 37.6 336:09.00 libvirtd You get the general idea. --