Mitsubishi Denki Kabushiki Kaisha

Jose Uemura

Takashi Sakakura

Data transmission system and methods in which data is automatically selected based upon, the processing ability of a client and the condition of a data transmission line connecting a server and the client. A terminal attribute unit that collects ability characteristics of the client and a line controller that collects the transmission rate of the data transmission line are provided in the server. A data attribute provider provides a proper data type and data amount of transmitting data in a profile based upon the collected information about the client. A data transmission agent refers to a correspondence table and selects data having a proper data amount. Then, the data transmission agent transmits the selected data to the client.

Client-optimized data transmission system and method

Data transmission system and methods in which data is automatically selected based upon the processing ability of a client and the condition of a data transmission line connecting a server and the client. A terminal attribute unit that collects ability characteristics of the client and a line controller that collects the transmission rate of the data transmission line are provided in the server. A data attribute provider provides a proper data type and data amount of transmitting data in a profile based upon the collected information about the client. A data transmission agent refers to a correspondence table and selects data having a proper data amount. Then, the data transmission agent transmits the selected data to the client.

A cache memory having four user memory areas in which different data in a main memory is to be respectively stored, and a system memory area in which shared data between programs in the user memory areas is to be stored. A data controller has a route register in which address information, such as information as to whether or not the data in the respective user memory area is replaceable and task information, is to be stored. The individual user memory areas are connected to one another via a cache internal address data bus and a user-area cache internal sub-address data bus. The internal bus is connected to a CPU bus and a memory bus via a memory management unit for performing address translation, etc.

Cache memory system having at least one user area and one system area wherein the user area(s) and the system area(s) are operated in two different replacement procedures

An incremental backup system includes a storage unit, which is accessed in block units of a predetermined size, for storing data to be backed up. Difference map information stored in the storage unit records the latest backup generation number, indicating when data in each block has been updated. A latest update generation management mechanism manages backup generation numbers for each block. A difference management mechanism inputs and stores backup data in a backup unit. The backup data includes data in a block of the storage unit which is updated in a specified backup generation based on the difference map information, a position of the block in the storage unit, and a backup generation in which the block has been updated.

Incremental backup system

The invention provides an exclusive control unit among computers which can reliably perform an exclusive control for a shared resource while keeping a system running as a whole even if a problem occurs in any of the computers in the system. Each of the computers is connected to the others through a LAN and to a distributed shared memory bus for connecting each distributed shared memory card mounted on each computer with the others. The distributed shared memory card has a distributed shared memory, which shares the shared resource with the other distributed shared memories, and a distributed shared memory controller which is connected with the distributed shared memory bus for making it possible to exchange data among the distributed shared memories mounted on the computers, an I/O bus inside its own computer, and its distributed shared memory, through its internal bus, and the distributed shared memory card performs an exclusive control for the shared data which is shared among the respective computers and exchanged among them through the distributed shared memory bus.

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Tokyo, Japan

Jose Uemura