| 摘要 |
PROBLEM TO BE SOLVED: To provide a computer device, in which the maximum number of simultaneously executable virtual machines can be increased without probability of remarkable reduction in performance in execution of guest OS derived from the same snap shot image by a plurality of virtual machines on one actual machine. SOLUTION: This computer device 200 comprises a CPU 201, an I/O interface 202, a storage memory 203 and a program storage area 204, and restores and executes a plurality virtual machines from the same snap shot image. The snap shot image shared by two or more virtual machines is retained in a memory area 100 of a host OS. Detection of writing memory access to the shared snap shot image 104 is performed, and when writing memory access is detected, a partial area of the snap shot image is copied to differential memory areas 109 independently assigned to the virtual machines. COPYRIGHT: (C)2007,JPO&INPIT
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