User`s guide

Managing Resources 123
Managing Virtual Machine
Resources
Parallels Server Bare Metal allows you to manage the following resources of your virtual
machines:
 main memory
 number of CPUs
 video memory
The procedure of managing these resources is described below in this section.
Configuring Main Memory
To configure the amount of memory that will be available to the virtual machine, use the --
memsize option of the pctl set command. The following session shows how to change the
amount of memory for the MyVM virtual machine from 512 MB to 756 MB and to check that the
new value has been successfully set:
# pctl list -i MyVM | grep memory
memory 512Mb
# pctl set MyVM --memsize 756
Set the memsize parameter to 756Mb
The VM has been successfully configured.
# pctl list -i MyVM | grep memory
memory 756Mb
You can configure the memory size for both running and stopped virtual machines.
Configuring the Number of CPUs
If the Parallels server has more than one physical processor installed, you can control the
number of CPUs which will be used to handle the processes running inside your virtual
machines. By default, a virtual machine is allowed to consume the CPU time of one processor
only. However, you can modify the number of physical CPUs which will be simultaneously
available to a virtual machine using the --cpus option of the pctl set command. For
example, if your server has 4 physical processors installed, you can set the processes inside the
MyVM virtual machine to be run on 2 CPUs by issuing the following command:
# pctl set MyVM --cpus 2
Set cpus(2): 2
The VM has bee successfully configured.
Note: The maximum allowable number of virtual CPUs depends on the number of physical
CPU cores available on the Parallels server. For example, if you have a Core 2 Duo physical
processor, the maximum allowable number of virtual CPUs will be 2.
You can check if the number of CPUs has been successfully changed by running this command:
# pctl list -i MyVM | grep cpu
cpu 2 VT-x acc1=high mode=32