Hitachi, Ltd.

Hitachi Software Engineering Company, Ltd.

Nobuhiro Ioki

Chisato Konno

Miyuki Saji

Saori Mitsunaga

Michiru Yamabe

Mototugu Yaginuma

A different phase type is specified toward each of a plurality of processors constituting a parallel computer, thereby, in a changeable manner, generating M sequence random numbers having the phase type. An information inputting unit inputs, into a random-number generating process unit, the number of the processors used in a parallel processing, the number of the random numbers to be generated by a single processor, the number of the phase types of the random numbers to be generated, and phase type information for each processor. The random-number generating process unit includes a phase-type management-table creating process unit, an initial-value table generating process unit, and a random-number generating calculation unit. Based on the number of the phase types of the random numbers to be generated and the phase type information for each processor, the phase type management table-creating process unit creates a phase type management table that manages which phase type of random numbers each of the processors generates. The initial-value table generating process unit creates an initial value table that generates the random numbers from the information stored in the phase type management table. The random-number generating calculation unit generates the random numbers from the created initial value table in accordance with a generation rule of the M sequence random numbers. An information outputting unit outputs random numbers that correspond to a phase type specified by the phase type information for each processor.

Random-number generating method and apparatus and storage medium therefor

In a distributed memory parallel computer system, each processor unit has a communication status managing table for managing a status as to other processor units to which data transmission is authorized, and a data transmitting processor unit starts the data transmission after it has confirmed that a data receiving processor unit is ready to receive the data, and the receiving processor unit informs the readiness of data reception by updating the communication status managing table of the transmitting processor unit.

Communication processing method in parallel computer and system therefor

A program generating method for automatically generating a program used in a simulation of a physical phenomenon by using computers, wherein inputted information such as the shape of a domain where the physical phenomenon such as that in a fluid takes place, mesh division information therefor, a partial differential equation dominantly representing the physical phenomenon and boundary conditions thereof are inputted, differential operators included in the inputted partial differential equation and an equation representing the boundary condition are expanded to generate discrete equations and the generated discrete equations are coded to automatically generate simulation programs. Information indicating whether discrete points which are evaluation points of the values of variables included in the inputted partial differential equation are located at mesh points or at intermediate points between mesh points is inputted the relative positional relations between mesh points and the discrete points of the variables, and relative discrete equations are generated in accordance with the inputted information by discretizing the differential operators included in the partial differential equation by using a conversion table or a conversion program, where the position of a variable to be solved in the partial differential equation is designated as a reference point relative discrete equations are converted to discrete equations for an absolute position in the region where the physical phenomenon takes place, thereby generating the simulation program.

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Ebina, Japan

Nobuhiro Ioki