Fujitsu Corporation

Naoki Odate

Koichiro Yamashita

Koji Kurihara

Hiromasa Yamauchi

Takahisa Suzuki

Toshiya Otomo

Tetsuo Hiraki

Fumihiko Hayakawa

Katsuhiro Yoda

Akihito Kataoka

A data communication method includes registering as a group and by a first data processing device of plural data processing devices, at least one second data processing device capable of communicating with the first data processing device; transmitting by the first data processing device and to the data processing devices, a first reception request for data; transmitting by the first data processing device and to the at least one second data processing device, a second reception request for the data when there is no response to the first reception request from the first data processing devices; and transmitting the data to the second data processing device, by the first data processing device and based on a response from the second data processing device.

Data communication method and data communication system

A file sharing method executed by a first terminal, and including selecting from among multiple terminals including the first terminal and based on a remaining battery level of the terminals and a processing time of a shared process, a second terminal to execute the shared process for sharing multiple files among the terminals; and assigning the shared process to the second terminal.

File sharing method and terminal

A thread processing method is executed by a specific apparatus included among a plurality of apparatuses, and includes assigning one thread among a plurality of threads to the apparatuses, respectively; acquiring first time information that indicates a time at which the specific apparatus receives an execution result of a corresponding thread from each of the apparatuses; and setting a priority level of an access right to access shared memory that is shared by the apparatuses and the specific apparatus, the setting being based on the first time information and second time information that indicates a time at which reception of execution results of the threads from the apparatuses ends.

Thread processing method and thread processing system for setting for each thread priority level of access right to access shared memory

A system includes a CPU; an accelerator; a comparing unit that compares a first value that is based on a first processing time period elapsing until the CPU completes a first process and a second processing time period elapsing until the accelerator completes the first process, and a second value that is based on a state of use of a battery driving the CPU and the accelerator; and a selecting unit that selects any one among the CPU and the accelerator, based on a result of comparison by the comparing unit.

Scheduling process on a processor or an accelerator on a system driven by battery based on processing efficiency and power consumption

A data communication method includes determining by a first terminal apparatus that is included among plural terminal apparatuses capable of direct communication with one another, whether a communication volume of data received from a second terminal apparatus that is included among the terminal apparatuses exceeds a processable communication volume; and transmitting by the first terminal apparatus to the second terminal apparatus, a portion of the data of a given communication volume, when the communication volume of the data exceeds the processable communication volume.

An exclusive access control method is executed by a computer having an operating system that when an excluded thread accesses a shared resource, executes a first exclusive access control process of prohibiting the excluded thread from attempting to access the shared resource until exclusive access control is released, the exclusive access control process being executed according to a number of attempts, by the excluded thread, to access the shared resources. The exclusive access control method includes counting by at least one second thread, including the excluded thread and different from a first thread, the number of attempts to access the shared resource, when the first thread executes a second exclusive access control process of allowing the excluded thread to attempt to access the shared resource until the excluded thread is permitted access; and storing to a memory area by the second thread, the counted number of attempts.

Exclusive access control method prohibiting attempt to access a shared resource based on average number of attempts and predetermined threshold

A multi-task scheduling method includes assigning a first thread to a first processor; detecting a second thread that is executed after the first thread; calculating based on a load of a processor that is assigned a third thread that generates the second thread, a first time that lasts until a start of the second thread; calculating a second time that lasts until completion of execution of the first thread; and changing a first time slice of the first processor to a second time slice when the second time is greater than the first time.

Multi-task scheduling method for assigning threads based on time slices to multi-core processors and multi-core processor system therefor

A data sharing method includes detecting by a first data processing apparatus that is among multiple data processing apparatuses that share data, any one among a shortage of available memory, a change in remaining battery power, a change in a relative positional distance of the first data processing apparatus to a second data processing apparatus that is among the data processing apparatuses, a change in a communication speed of communication with the second data processing apparatus, and an interruption of communication with the second data processing apparatus; and transmitting by the first data processing apparatus to a third data processing apparatus that is among the data processing apparatuses, a shared portion of the data saved in the first data processing apparatus.

Data sharing method and data processing system

A scheduling method is executed by a first apparatus among a plurality of apparatuses. The scheduling method includes assigning a process to at least one apparatus among the apparatuses based on a first table that includes each communication strength of the apparatuses; receiving an execution result of the process and a communication strength from the at least one apparatus; and creating the first table based on the received communication strength.

Scheduling method and task processing method

A data processing method that is executed by a first data processing apparatus included among plural data processing apparatuses, includes producing a copy of data, and restoration information that includes a first address of memory to which the copy of the data is stored; transmitting any one among the data and the copy of the data to a second data processing apparatus that is included among the data processing apparatuses; and storing the restoration information to shared memory that is memory of at least one data processing apparatus among the data processing apparatuses, and shared among the data processing apparatuses.

Data processing method for storing data and restoration information and data processing system

A data processing system includes an interrupt controller that counts, as an interrupt processing execution count, executions of interrupt processing by threads executed by data processing devices; and a processor that is configured to select one scheduling method from among a plurality of scheduling methods, based on the interrupt processing execution count.

Data processing system and scheduling method

A scheduling method is executed by a given CPU among multiple CPUs. The scheduling method includes subtracting for each of the CPUs, a number of processes assigned to the CPU from a maximum number of speculative processes that can be assigned to each of the CPUs; summing results yielded at the subtracting to yield a total number of speculative processes; and assigning to the CPUs, speculative processes of a number is less than or equal to the total number of speculative processes.

Assigning speculative processes to plurality of CPUs based on calculated maximum number of speculative processes capable of being assigned and other processes assigned to each CPU

A scheduling method that is executed by a first central processing unit (CPU) includes determining whether a task belongs to a first task category; determining whether a first access area accessed by the task is located in a first memory or a second memory, when the task belongs to the first task category; and setting a memory accessed by the task to the first memory or the second memory, based on a result at the determining.

Scheduling method and system

A thread processing method that is executed by a multi-core processor, includes supplying a command to execute a first thread to a first processor; judging a dependence relationship between the first thread and a second thread to be executed by a second processor; comparing a first threshold and a frequency of access of any one among shared memory and shared cache memory by the first thread; and changing a phase of a first operation clock of the first processor when the access frequency is greater than the first threshold and upon judging that no dependence relationship exists.

Thread processing method for using a multi-core processor and systems therefor

A multicore processor system includes multiple processors; a device; a memory that stores information of voltage and clock frequency for minimizing power consumption in connection with a number of the processors accessing to the device; and a power control unit that controls the voltage and the clock frequency of the processors on the basis of the information stored in the memory if the number of the processors accessing to the device changes.

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Akiruno, Japan

Naoki Odate