Hitachi, Ltd.

Katsuto Miyazaki

Toshio Hirosawa

Masaru Ohki

Kenji Fujikata

Junichi Kurihara

Kazumitu Kondo

A loosely coupled multi-processor system including a plurality of terminals and corresponding processors. When a particular terminal tries to start a program, the corresponding processor sets the largest number of the terminals, which are serviceable, on the basis of the load status of the processors which are permanently watched by the OS (operating system) in a main memory. The processor compares this largest number with the number of terminals, which are in service at that time and when the number of the terminals, which are in service, is smaller than the largest number, processing by the terminal issuing a service demand begins. Alternatively, when the number of the terminals, which are in service, is equal to or greater than the largest number, the processor cannot treat the service demand from the terminal and reports this to a global processor. The global processor examines the load status indicator contained therein which shows the load status of each of the system processors; selects the processor having the lightest load status; and issues an order to treat the service demand from the requesting terminal to the selected processor having the lightest load. The processor, which has received the order, performs the processing of the service demand from the requesting terminal, based on the instruction from the global processor.

Load balancing control method for a loosely coupled multi-processor

An argument which is a set consisting a global variable in a procedure to be called, a designation symbol representing localization and a variable or constant on a procedure call side is designated as an argument of a procedure call statement of a program, the global variable in the called procedure is localized in the procedure in response to the designated information, and the value of the variable on the procedure call side which is a member of the set is used as the initial value of the local variable. An argument which is a set consisting of a local variable in a procedure to be called, a designation symbol representing globalization and a variable on a procedure call side is designated as an argument of a procedure call statement of a call program, the local variable in the called procedure is globalized in response to the designation information, and a data area which is the same as that of the variable on the procedure call side, which is a member of the set, is used. A procedure call statement is designated by omitting an argument of a procedure call statement of a call program, the omitted argument in the procedure is processed as a global variable, and a data area which is the same as that of a variable on the procedure call side, which has the same name as that of the argument in the procedure, is used.

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Hachioji, Japan

Katsuto Miyazaki