Parallel computer system, control method of parallel computer system, information processing device, arithmetic processing device, and communication control device

A control method of a parallel computer system, the parallel computer system including,

• a plurality of information processing devices, each of the plurality of information processing devices including a communication control device that performs communication,
• a main memory that stores data, and
• an arithmetic processing device that is coupled to the communication control device and the main memory, the plurality of information processing devices being coupled to each other through a network by the respective communication control device,
• the control method comprising:
• executing an atomic operation for target data on a cache memory that stores the target data when the communication control device outputs an atomic operation request that is used to request the atomic operation by the arithmetic processing device;
• and
• notifying the communication control device of a result that is obtained by executing the atomic operation on the cache memory by the arithmetic processing device, wherein
• the communication control device includes,
• a request unit that outputs the atomic operation request to the arithmetic processing device and the main memory when an atomic operation request message for requesting the atomic operation is received by the request unit, the atomic operation request message being transmitted through the network,
• a reception unit that receives first processing result notification, from one of the arithmetic processing device and the main memory, that is notification of a processing result obtained by executing the atomic operation in response to the atomic operation request that is output from the request unit, and
• a control unit that determines second processing result notification that is used to generate a response for the atomic operation request message on the basis of a transmission source information and execution information of the atomic operation, the transmission source information and the execution information being included the first processing result notification received by the reception unit, generates the response using the determined second processing result notification, and outputs the generated response to the network, and wherein
• the control unit generates the response using execution notification that indicates that the atomic operation is executed on the cache memory when the reception unit receives the execution notification, and generates the response using the first processing result notification from the main memory when the reception unit receives the processing result notification from the main memory without receiving the execution notification.

A communication control device that is coupled to an arithmetic processing device being coupled to a main memory that stores data, and including a processing unit that executes an atomic operation for target data on a cache memory that stores the target data when the communication control device outputs an atomic operation request that is used to request the atomic operation, and a notification unit that notifies the communication control device of a result that is obtained by executing the atomic operation on the cache memory, the communication control device comprising:

• a request unit that outputs the atomic operation request to the arithmetic processing device and the main memory when an atomic operation request message that is a message that is transmitted through a network in order to request the atomic operation is received;
• a reception unit that receives processing result notification that is notification of a processing result that is obtained by executing the atomic operation by the atomic operation request that is output from the request unit, from one of the arithmetic processing device and the main memory;
• and
• a control unit that determines processing result notification that is used to generate a response for the atomic operation request message, generates the response using the determined processing result notification, and outputs the generated response to the network, based on a transmission source of the processing result notification that is received by the reception unit and execution information of the atomic operation, which is indicated by the processing result notification, wherein
• the control unit generates the response using execution notification that indicates that the atomic operation is executed on the cache memory when the reception unit receives the execution notification, and generates the response using the first processing result notification from the main memory when the reception unit receives the processing result notification from the main memory without receiving the execution notification.

A parallel computer system comprising:

• a plurality of information processing devices, each of the plurality of information processing devices including a communication control device that performs communication, a main memory that stores data, and an arithmetic processing device that is coupled to the communication control device and the main memory, the plurality of information processing devices being coupled to each other through a network by the respective communication control device, wherein
• the arithmetic processing device includes a cache memory and a cache controller, the cache controller that
• executes an atomic operation for target data on the cache memory that stores the target data when the communication control device outputs an atomic operation request that is used to request the atomic operation, the atomic operation being not divided into a smaller operation, and
• notifies the communication control device of a result that is obtained by executing the atomic operation on the cache memory, wherein
• the main memory includes a main memory controller that executes the atomic operation for the target data when the communication control device outputs the atomic operation request, and notifies the communication control device of a result that is obtained by executing the atomic operation for the target data, wherein
• the communication control device includes,
• a request unit that outputs the atomic operation request to the arithmetic processing device and the main memory when an atomic operation request message for requesting the atomic operation is received by the request unit, the atomic operation request message being transmitted through the network,
• a reception unit that receives first processing result notification, from one of the arithmetic processing device and the main memory, that is notification of a processing result obtained by executing the atomic operation in response to the atomic operation request that is output from the request unit, and
• a control unit that determines second processing result notification that is used to generate a response for the atomic operation request message on the basis of a transmission source information and execution information of the atomic operation, the transmission source information and the execution information being included the first processing result notification received by the reception unit, generates the response using the determined second processing result notification, and outputs the generated response to the network, and wherein
• the control unit generates the response using execution notification that indicates that the atomic operation is executed on the cache memory when the reception unit receives the execution notification, and generates the response using the first processing result notification from the main memory when the reception unit receives the processing result notification from the main memory without receiving the execution notification.