Information processing apparatus and control method of information processing apparatus

An information processing apparatus comprising a plurality of mutually connected system boards,

• wherein each of the plurality of mutually connected system boards comprises:
• a plurality of processors;
• and
• a plurality of memories each of which stores data and directory information corresponding to the data, and corresponds to any one of the processors, and
• wherein each of the plurality of processors, upon receiving a read request for data stored in a memory corresponding to the own processor from another processor, performs an exclusive logical sum operation on identification information included in the read request and identifying the another processor and a check bit included in the directory information and identifying a processor which holds target data of the read request, increments a count value included in the directory information and indicating the number of processors which hold the target data, sets presence information included in the directory information and indicating a system board which includes the another processor, and outputs the target data to the another processor which has issued the read request.