Data transfer technique for distributed memory type parallel computer

The present invention relates to a distributed memory type parallel computer, more particularly to a technique for transferring data between processes executed by the distributed memory type parallel computer. The object of the present invention is to speed up data transfer between processes required when there is a variable duplicatively assigned to a plurality of processes (duplicatively assigned variable) and any process among the plurality of processes substitutes data into the duplicatively assigned variable. In a distributed memory type parallel computer for executing a plurality of processes using a plurality processing devices connected via a communication network, each of the processing devices for executing at least one process among the plurality of processes comprises a scheduler for scheduling data transfer of the substituted data to each process if the process substitutes data into a variable a duplicatively assigned throughout the plurality of processes, and transfer means for carrying out data transfer via the communication network in accordance with the scheduler. Appropriate scheduling speeds up data transfer. It is also possible to carry out data transfer to the process itself via a communication network on behalf of the substitution processing.