I tried both on VirtualBox and vmware
when guest stop, the free memory of host is 4G~6G
when guest running but "nothing" is working in guest, the free memory of host is 3G~5G
when the guest is working(like windows update), the memory of host left only 100M~1G, and every operation in host is very slow.
and then, I power off the guest, the free memory of host is back to 4G~6G, and no slow motion immediately
I can't figure out the memory usage of virtual machine.
thanks for any reply