Information processing system, relay device, and communication control method

A relay device relaying data between information processing devices, the relay device comprising:

• communication ports configured to communicate with another relay device;
• processing hardware:
• configured to cause a first transmission/reception operation and a second transmission/reception operation to be selectively executed, the first transmission/reception operation being an operation in which data is caused to be transmitted and received at a first transmission speed in the communication ports, the second transmission/reception operation being an operation in which data divided into a plurality of data equal to a number of communication ports is caused to be transmitted and received in parallel in the number of communication ports at a second transmission speed, lower than the first transmission speed;
• and
• configured to generate divided transmission data, which number of divided transmission data is equal to the number of communication ports, to cause the generated divided transmission data to be transmitted in parallel through the respective communication ports, when the second transmission/reception operation is selected.

A communication control method for a relay device in an information processing system including information processing devices, the relay device configured to relay data transmitted and received between the information processing devices, the method comprising:

• selecting one of a first transmission/reception operation and a second transmission/reception operation in response to a distance of a transmission path between communication ports of the relay device and communication ports of another relay device, the first transmission/reception operation being a transmission/reception operation in which data is caused to be transmitted and received at a first transmission speed in the communication ports of the relay device, the second transmission/reception operation being a transmission/reception operation in which data divided into a plurality of data equal to a number of communication ports is caused to be transmitted and received in parallel in the number of communication ports at a second transmission speed, lower than the first transmission speed;
• executing the selected one of the first transmission/reception operation and the second transmission/reception operation;
• generating divided transmission data, which number of divided transmission data is equal to the number of communication ports of the relay device, when the second transmission/reception operation is selected;
• and
• causing the generated divided transmission data to be transmitted in parallel through the respective communication ports of the relay device.