Process migration method computer and system

A computer serving as a first computer which copies, to a second computer via a network, a process context indicative of processing which the first computer executes, comprising;

• a copy unit configured to copy the process context;
• a first transmission unit configured to transmit the process context to the second computer;
• a first generation unit configured to generate a first execution record concerning the processing when the process context is started to be transmitted;
• a determination unit configured to determine, from the first execution record, whether or not the processing should be migrated from the first computer to the second computer;
• if the determination unit determines that the processing should postpone being migrated,
• a first finishing unit configured to finish the generation of the first execution record,
• a second generation unit configured to generate a second execution record,
• a second transmission unit to transmit the first execution record to the second computer, the generation of the first execution record being finished, and
• a receiving unit configured to receive, from the second computer, a first message expressing that reproduction based on the first execution record is finished, the determination unit determining, from the second execution record, whether or not the processing should be migrated from the first computer to the second computer, after the receiving unit receives the first message.

A system including a first computer and a second computer which are connected via a network, the first computing executing first processing indicated by a process context,

• the first computer comprising:
• a copy unit configured to copy the process context;
• a first transmission unit configured to transmit the process context to the second computer;
• a generation unit configured to generate a first execution record concerning the processing when the process context is started to be transmitted;
• a determination unit configured to determine, from the first execution record, whether or not the first processing should be migrated from the first computer to the second computer;
• if the determination unit determines that the first processing should postpone being migrated,
• a first finishing unit configured to finish the generation of the first execution record,
• a second generation unit configured to generate a second execution record based on the first execution record,
• a second transmission unit configured to transmit the first execution record to the second computer, the generation of the first execution record being finished, and
• a first receiving unit configured to receive, from the second computer, a first message expressing that reproduction based on the second execution record is finished,
• the second computer comprising:
• a second receiving unit configured to receive the process context;
• a third receiving unit configured to receive the first execution record;
• a fourth receiving unit configured to receive a determination result determined by the determination unit,
• if the determination result indicates that the first processing should postpone being migrated,
• a fifth receiving unit configured to receive the second execution record,
• a third transmission unit configured to transmit the first message, and
• a fourth transmission unit configured, to the first computer, to transmit a control signal which controls the determination unit so as to again determine whether or not the first processing should be migrated from the first computer to the second computer, the control signal being transmitted after the reproduction of the process context is finished in the second computer.