Hitachi, Ltd.

Masaki Hamamoto

Tetsuya Yamada

Atsushi Miyamoto

Takashi Takeuchi

Junichi Miyakoshi

Atsushi Tomoda

Disclosed herein is a computer system including multiple worker nodes, each being equipped with an electric power generation unit and an electric power storage unit storing electric power generated by the electric power generation unit, and a master node responsible for management of tasks that are assigned to the worker nodes. Each worker node determines an operating cycle time of the worker node to execute a task assigned by the master node or communicate with any other worker node, based on information indicating a change in electric power stored in the electric power storage unit of the worker node.

System for determining operating time of a computer to execute assigned tasks based on an amount of change per unit time of a stored electric power

There is provided a parallel computer system for performing barrier synchronization using a master node and a plurality of worker nodes based on the time to allow for an adaptive setting of the synchronization time. When a task process in a certain worker node has not been completed by a worker determination time, the particular worker node performs a communication to indicate that the process has not been completed, to a master node. When the communication has been received by a master determination time, the master node performs a communication to indicate that the process time is extended by a correction process time, in order to adjust and extend the synchronization time. In this way, it is possible to reduce the synchronization overhead associated with the execution of an application with a relatively large variation in the process time from a synchronization point to the next synchronization point.

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Kokubunji, Japan

Masaki Hamamoto