Information processing system and information processing method

An information processing method which is executed in an information processing system which comprises one or more devices which execute predetermined processing, a controller which controls the devices, and a memory which is provided in the controller and in which command queues for each of the devices are defined, the information processing method comprising:

• a first step in which a device among the devices refers to a value of fetch information of a command fetched by the device, wherein the controller writes the command for the device to a corresponding command queue which is the command queue corresponding to the device, the command includes a field for storing the fetch information which indicates whether the command has been fetched, and the device fetches the command from the corresponding command queue;
• and
• a second step in which the device executes, if the value of the fetch information is a first value indicating that the command has not been fetched, the command after updating the value of the fetch information of the command which is stored in the command queue to a second value indicating that the command has been fetched, and the device executes, if the value of the fetch information is the second value, predetermined error processing instead of executing the command.