Hitachi, Ltd.

Nippon Kokan Kabushiki Kaisha

Hitachi Microcomputer System, Ltd.

Kozo Nakai

Kinji Mori

Katsumi Kawano

Yasuo Suzuki

Masayuki Orimo

Hirokazu Kasashima

Minoru Koizumi

Toshihiko Sekizawa

Setsuo Kawakami

Isao Wachi

Hirokazu Kasahima

Yasuo Morooka

Shinya Tanifuji

Hiroyuki Ogura

Hirokazu Kasajima

Shinji Hori

Tsunao Kanzaki

Minoru Koizumo

Hiroshi Shibayama

Nobuyuki Togashi

According to the present invention, a file recovery system is provided in which the commands for recovering files such as a historical file are unnecessitated and the recovery system configuration is independent of the host processing system. That is, since the equipment for achieving a file recovery does not have information about the location of the recovery data, information about the content of a file to be recovered is transmitted to a transmission line. The other equipments asynchronously receive the information and judges whether or not a file containing the same content exists in the own system. If its file exists, the content of the file is transmitted to the transmission line. The equipment achieving the file recovery asynchronously receives from the transmission line the file data of files such as a historical file and establishes data consistency by use of the buffered current data and the event number, thereby recovering files such as a historical file.

Method and apparatus for recovering data for a file in a plurality of equipments

Attribute information of programs developed by processors in a distributed processing system include I/O data for defining I/O operation of the programs, which is given in a program description form. A correlation of the programs is checked based on the content of the attribute information. Program generation information, program content information and program modification information are added to the sharedly developed programs and they are updated in the course of development.

Method for managing programs with attribute information and developing

In a software distributedly preparing method for preparing a plurality of program modules combined by exchange of message data, in generating software modules and message data, repetition or similarity in the defined contents of the message data and multiple definition of a data item constituting the message data, and the defined contents of the message data are unified or separated to assure its consistency and preparing it as a data base which will be used in preparing a software module.

Method for producing program modules

A program processing method in a distributed processing system including a shared transmission medium and a plurality of processors connected thereto in which a sequence of processing is executed by the processors in a distributed manner and programs for executing the sequence of processing are respectively stored in the processors. Each processor executed, when information necessary for an execution of a program stored therein is arranged, the program with the arranged information set as input information and then transmits information resultant from the execution to the shared transmission medium. When storing a new program described conforming to a predetermined program, the processor detects program codes respectively of input and output instruction parts of the program to rearranged the parts such that the program codes respectively of the input and output instruction parts are located at positions in the program respectively before and after other processing part. When information necessary for an execution of the program is prepared, the processor executes the input and output instruction parts respectively before and after the other processing.

Program processing method and apparatus for producing a data flow type

A distributed processing method and system including a plurality of processors connected via a transmission path, in which a function is provided to an arbitrary processor to receive information and data passing through the transmission path and to obtain the received data based on information indicating input/output relationships between modules corresponding to the association of processing between the modules. When required, necessary portions of the obtained information and logging results are extracted, so that not only the time series data log but also the information or data log can be collected corresponding to the flow of a sequence of processing by establishing a display or print-out module. Furthermore, when data is received from an external device, the system generates a message having information indicating the order of the data and the content code representing content of the data and sends the message to the transmission path. A processor receives messages from the transmission path, and stores the data in accordance with each content code in an order which facilitates trouble shooting of the system.

Distributed processing system and method for job execution using a

In a distributed processing system wherein a plurality of processors are connected through a network and wherein programs are transmitted among the processors; each of the processors monitors the status of a program in the processor or the load status of any other of the processors as indicated by a message on the network. Upon performance of a judgement operator, the processor broadcasts a message indicative of the status of the processor or a program with a content indicating code affixed thereto, to another network, and the processor having received the message broadcasts a program existent in the other processor to the network along with the code indicative of the content of the program. The broadcast is performed in the other processor in accordance with the load statuses of the processors, and upon judging the content of the received message. Each processor judges whether or not the program being broadcast corresponds to a function necessary for a process of the processor based on the code indicative of the content of the program. If the program is needed, the processor loads and executes the program.

Program loading method and system for distributed processing system

Programs in a plurality of processors connected through a common network are started when a plurality of data necessary for starting the program are received from the network. When the processor receives data from an external equipment, it adds the event number to the data and sends it to the network, and each processor determines whether all data necessary for starting the program in itself have been received and checks the relation among the received data by comparison with the event numbers of the received data.

Method for processing data in a distributed processing system

A distributed processing system distributively performs a series of processes for a job at a plurality of processing units connected to a common transmission path and has a circuit for transmitting information from a processing unit to the common transmission path. The distributed processing system includes a circuit for receiving from the common transmission path the information required for the processing of a program stored in each processing unit, and a circuit for detecting if all the information required for the processing of the program has been collected, for performing the processing of the program using the collected information as input information for the processing and for transmitting the processed result data to the common transmission path. Managing of the programs is performed by transmitting a program stored in each processing unit or a program newly generated or modified by each processing unit, together with program generation information, to the common transmission path and discriminating a difference between generations of a plurality of developed programs.

Method of managing programs for distributed processing systems and

The present invention consists in that, when a program constitution in each of processors connected to a common transmission line has changed, a message to this effect is broadcast to the common transmission line, and that, when the message has been received from the common transmission line, information on programs stored in the own processor is broadcast to the common transmission line, whereby the messages indicating the program constitutions in the individual processors are automatically broadcast onto the transmission line at the changes of the constitutions of programs. Besides, in a system wherein a series of processes are executed by a plurality of programs, the relation among programs according to the flow of the series of processes can be recognized using information on the input/output data of each of the programs.

System for recognizing program constitution within a distributed

In a distributed processing system wherein a plurality of processors are connected by a transmission medium; a simulation method for a distributed processing system characterized by defining transmission delay times ascribable to the transmission medium, input/output data items and processing times of respective programs which are set in the system, and numbers of the processors in which the programs are stored.

Method for simulating the operation of programs in a distributed

In a distributed system having a plurality of processors connected to a common transmission line, each processor comprises means for registering erroneous programs within the processor, and means for changing modes, so that a program is diagnosed on the basis of a processed result of data accepted from the transmission line and is registered in the erroneous program registration means if it is erroneous, and that the mode change means changes-over the test mode and the on-line mode by reference to the erroneous program registration means and in correspondence with the programs registered in or canceled from the registration means.

Test method and apparatus for distributed system

A system for loading a program in a distributed system including a plurality of information processing units interconnected by a transmission system comprises an information processing unit for preparing a program and sending the program to the transmission system, another information processing unit having means for receiving the program from the transmission system and storing the program in a memory in accordance with a content of the program, and means for retrieving a program based on program structural information, which program corresponds to the program structural information, and sending the retrieved program to the transmission system, and other information processing units each having means for sending the program structural information to the transmission system and means for selecting a corresponding program from the transmission system and loading the selected program in the unit.

Method and apparatus for loading programs in a distributed processing

In a system which includes of subsystems, and a transmission medium for coupling them, and in which a token is sent to the transmission medium, whereby the transmission medium is occupied; a transmission control method characterized, at least, in that each of the certain subsystems appends a code indicative of a function of certain data to the token and sends the resulting data to the medium, and that the subsystem receiving the data refers to the code indicative of the function of the data, thereby to independently judge whether or not the data is to be accepted into the own subsystem.

Data transmission control method and apparatus

A message processing system has a common transmission medium and a plurality of processors or processing equipments connected to the common transmission medium. The processors process messages independenty from each other. Each processor adds information relating to an order of messages to a message resulting from processing by the processor and sends to resulting message to the common transmission medium. In accordance with the invention, a plurality of messages are readily identified.

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Katsuta, Japan

Kozo Nakai