Information processing apparatus, input and output control device, and method of controlling information processing apparatus

An input and output control device that is coupled to a plurality of node devices and one or more input and output devices, each node device including an arithmetic processing unit and one or more first memories coupled to the arithmetic processing unit, the input and output control device comprising:

• one or more second memories configured to store history information including an entry in which input and output device identification information for identifying an input and output device that is accessed based on a request corresponds to node identification information for identifying a node device of the plurality of node devices which is a transmission source of the request;
• and
• an input and output bus bridge coupled to the one or more second memories and configured to:
• determine the node identification information corresponding to the input and output device identification information that indicates an input and output device which outputs a memory access request to the one or more first memories based on search of the entry in the history information,
• generate a packet in which the determined node identification information is set to a memory access destination based on the memory access request, and
• output the generated packet,
• wherein each of the plurality of node devices is configured to:
• receive the packet output from the input and output control device,
• obtain the node identification information corresponding to a physical address included in the received packet based on first corresponding information, the first corresponding information storing in which a physical address range corresponds to the node identification information for each physical address range of the one or more first memories,
• determine whether the obtained node identification information is the node identification information identifying own node device, and
• transfer the received packet to another node device when it is determined that the obtained node identification information is not the node identification information that identifies the own node device.

A method of controlling an information processing apparatus including a plurality of node devices that respectively include an arithmetic processing unit and one or more first memories coupled to the arithmetic processing unit, one or more input and output devices, and an input and output control device that is coupled to the plurality of node devices and one or more input and output devices, the method comprising:

• determining, by the input and output control device, based on search of an entry in history information including an entry in which input and output device identification information for identifying the input and output device that is accessed based on a request corresponds to node identification information for identifying a node device of the plurality of node devices which is a transmission source of the request, the node identification information corresponding to the input and output device identification information that indicates an input and output device which outputs a memory access request to the one or more first memories;
• generating, by the input and output control device, a packet in which the determined node identification information is set to a memory access destination based on the memory access request;
• outputting, by the input and output control device, the generated packet;
• receiving, by at least one of the plurality of node devices, the packet output from the input and output control device;
• obtaining, by the at least one of the plurality of node devices, the node identification information corresponding to a physical address included in the received packet based on first corresponding information, the first corresponding information storing in which a physical address range corresponds to the node identification information for each physical address range of the one or more first memories;
• determining, by the at least one of the plurality of node devices, whether the obtained node identification information is the node identification information identifying own node device;
• and
• transferring, by the at least one of the plurality of node devices, the received packet to another node device when it is determined that the obtained node identification information is not the node identification information that identifies the own node device.