Virtual computer system, printer control system, virtual computation method, printer control method, and storage media

A printer control system comprising:

• a snapshot creating unit that creates at least one or more snapshots each having recorded therein a state of a virtual machine, the state including a printer control program that operates on a guest operating system installed on the virtual machine;
• a snapshot managing unit that stores a snapshot created after the printer control program is installed and initialized in a snapshot storing unit, as a reference snapshot among the snapshots created by the snapshot creating unit, and manages the reference snapshot;
• and
• a program executing unit that requests the snapshot managing unit to cause the virtual machine to read the reference snapshot, and executes the printer control program when an execution request for the printer control program is received for processing of a print job.

A virtual computation method comprising:

• saving at least one or more snapshots each having recorded therein a state of a virtual machine, the state including an application program installed on the virtual machine, the snapshot being saved as a reference snapshot;
• applying the reference snapshot to the virtual machine when an execution request for the application program is received;
• and
• saving a state of the virtual machine that executes the application program, the state being saved as a snapshot.

A printer control method comprising:

• creating at least one or more snapshots each having recorded therein a state of a virtual machine, the state including a printer control program that operates on a guest operating system installed on the virtual machine;
• storing a snapshot created after the printer control program is installed and initialized in a snapshot storing unit, as a reference snapshot among the snapshots created by the snapshot creating unit, and managing the reference snapshot;
• and
• requesting the snapshot managing unit to cause the virtual machine to read the reference snapshot, and executing the printer control program when an execution request for the printer control program is received for processing of a print job.

A non-transitory computer readable medium storing a program causing a computer to execute a process for virtual computation, the process comprising:

• saving at least one or more snapshots each having recorded therein a state of a virtual machine, the state including an application program installed on the virtual machine, the snapshot being saved as a reference snapshot;
• applying the reference snapshot to the virtual machine when an execution request for the application program is received;
• and
• saving a state of the virtual machine that executes the application program, the state being saved as a snapshot.

A non-transitory computer readable medium storing a program causing a computer to execute a process for printer control, the process comprising:

• creating at least one or more snapshots each having recorded therein a state of a virtual machine, the state including a printer control program that operates on a guest operating system installed on the virtual machine;
• storing a snapshot created after the printer control program is installed and initialized in a snapshot storing unit, as a reference snapshot among the snapshots created by the snapshot creating unit, and managing the reference snapshot;
• and
• requesting the snapshot managing unit to cause the virtual machine to read the reference snapshot, and executing the printer control program when an execution request for the printer control program is received for processing of a print job.