Effective determination of processor pairs for transferring data processed in parallel

An apparatus that serves as at least one of a plurality of information processing devices each including a group of arithmetic processors, the plurality of information processing devices being configured to perform parallel processing by using calculation result data of the groups of arithmetic processors included in the plurality of information processing devices, the apparatus comprising:

• a memory configured to store bandwidth information indicating a communication bandwidth with which an arithmetic processor included in the groups of arithmetic processors communicate with another arithmetic processor included in the groups of arithmetic processors, and
• a processor coupled to the memory and configured to, for a source arithmetic processor that is any one of the groups of arithmetic processors, determines a destination arithmetic processor that is one of the groups of arithmetic processors to which the calculation result data of the source arithmetic processor is to be transferred, based on the bandwidth information stored in the memory.

A method performed by at least one of a plurality of information processing devices each including a group of arithmetic processors, the plurality of information processing devices being configured to perform parallel processing by using calculation result data of the groups of arithmetic processors included in the plurality of information processing devices, the method comprising:

• providing a memory with bandwidth information indicating a communication bandwidth with which an arithmetic processor included in the groups of arithmetic processors communicate with another arithmetic processor included in the groups of arithmetic processors;
• and
• for a source arithmetic processor that is any one of the groups of arithmetic processors, determining a destination arithmetic processor that is one of the groups of arithmetic processors to which the calculation result data of the source arithmetic processor is to be transferred, based on the bandwidth information stored in the memory.