I'm using vSphere 5.1.
According to here, guest active memory in "Resouse Allocation" tab is:
Amount of memory recently accessed
From other hand, in "Performance" tab, active memory means from here:
Amount of guest physical memory in use by the virtual machine. Active memory is estimated by VMkernel statistical sampling and represents the actual amount of memory the virtual machine needs. The value is based on the current workload of the virtual machine.
So my question is what the differences between these two?