摘要:
Requestors acquire tokens before issuing access requests to a memory controller. The access requests issued are accumulated in a command queue of the memory controller. When the amount of access requests accumulated in the command queue is smaller than or equal to a first threshold, or in level 0, tokens are generated at a rate equivalent to 200% of a bus bandwidth. If the amount of accumulation is greater than the first threshold and is smaller than or equal to a second threshold, i.e., in level 1, tokens are generated at a rate equivalent to the bus bandwidth. If the amount of accumulation exceeds the second threshold, the token generation is stopped.
摘要:
To provide a multiprocessor system in which data transmission efficiency is unlikely to be affected if a damaged processor should exist among a plurality of processors. The multiprocessor system has a plurality of processing modules, including a predetermined number, being three or more, of processors, and a bus for relaying data transmission among the respective processing modules, and specifies at least one damaged processor; selects as a communication restricted processor subjected to communication restriction at least one of the processors connected to the bus at a position determined according to a position where the damaged processor is connected to the bus; and restricts data transmission by the communication restricted processor via the bus.
摘要:
Methods and apparatus provide for transferring a plurality of data blocks between a shared memory and a local memory of a processor in response to a single DMA command issued by the processor to a direct memory access controller (DMAC), wherein the processor is capable of operative communication with the shared memory and the DMAC is operatively coupled to the local memory.
摘要:
To provide a multiprocessor system in which data transmission efficiency is unlikely to be affected if a damaged processor should exist among a plurality of processors. The multiprocessor system has a plurality of processing modules, including a predetermined number, being three or more, of processors, and a bus for relaying data transmission among the respective processing modules, and specifies at least one damaged processor; selects as a communication restricted processor subjected to communication restriction at least one of the processors connected to the bus at a position determined according to a position where the damaged processor is connected to the bus; and restricts data transmission by the communication restricted processor via the bus.
摘要:
An information processing method includes: accepting a request for execution of a new task; identifying at least either one of a processing time required for the new task and a bus bandwidth required for processing the new task; making at least either one of comparisons between a total required processing time, which is a sum of processing times required for the new task and a reserved task reserved on a scheduler for indicating a procedure pertaining to a plurality of tasks, and a processing time available in an apparatus that executes those tasks, and between a total required bus bandwidth, which is a sum of bus bandwidths required for processing the reserved task and the new task, and a bus bandwidth available in the apparatus that executes those tasks; determining whether the new task is executable or not, based on the result of comparison(s); making a reservation for the new task on the scheduler if the new task is determined to be executable; and processing the tasks including the new task which is determined to be executable based on the scheduler, wherein the determining of whether the new task is executable or not includes acquiring priority information on the new task, and whether the new task is executable or not is determined based on the priority information acquired.
摘要:
Methods and apparatus provide for transferring a plurality of data blocks between a shared memory and a local memory of a processor in response to a single DMA command issued by the processor to a direct memory access controller (DMAC), wherein the processor is capable of operative communication with the shared memory and the DMAC is operatively coupled to the local memory.
摘要:
Requestors issue access requests to a memory controller. The access requests issued are accumulated in a command queue of the memory controller. When the amount of access requests accumulated in the command queue is smaller than or equal to a threshold, a free pass (FP) is granted to specified requesters. When issuing access requests, requesters request and acquire tokens before issuing the access requests if they have no FP granted. If the requesters have an FP, they simply issue the access requests.
摘要:
Methods and apparatus provide for logically-partitioning respective processors of a multi-processing system into a plurality of resource groups; and time-allocating resources among the resource groups as a function of a predetermined algorithm.
摘要:
An entertainment apparatus includes a storage unit that stores outside a kernel a device driver for a peripheral device. To make the peripheral device operable, a CPU causes an I/O processor to execute the device driver using a remote procedure call. Data is transferred between the peripheral device and the CPU through a direct memory access using a communication protocol that is commonly used in the apparatus.
摘要:
In an information processing system, when a request for execution of a new task is accepted, one or more of the required processing time and bus bandwidth for the new task are identified. A total required processing time, which is a sum of processing times required for the new task and a task reserved on a scheduler for indicating a procedure pertaining to a plurality of tasks, is compared with a processing time available in an apparatus executing those tasks. Similarly, a total required bus bandwidth, which is a sum of bus bandwidths required for processing the reserved task and the new task, is compared with a bus bandwidth available in the apparatus. Based on the result of the comparisons, it is determined whether the new task is executable.