VmSchedulerSpaceShared is an allocation policy that allocates one or more Pe to a VM, and doesn't allow sharing of PEs. If there is no free PEs to the VM, allocation fails.
VmSchedulerSpaceShared share=new VmSchedulerSpaceShared();

VmSchedulerTimeShared is a VMM allocation policy that allocates one or more Pe to a VM, and allows sharing of PEs by multiple VMs.
VmSchedulerTimeShared time=new VmSchedulerTimeShared();