Hitachi, Ltd.

Hitachi Process Computer Engineering, Inc.

Atsushi Matsuno

Yoshiaki Adachi

Hideki Tonooka

Hisao Kikuchi

Kiyokazu Tamura

Masayuki Tanji

Hiroshi Kobayashi

Hideki Sato

Toshimasa Saika

Shigeaki Wada

Masanori Horie

Masanori Naito

A network system has a plurality of nodes being operated by their communication application programs. In the network system, each of the nodes includes a transmission rate control module for obtaining a communication attribute required for controlling a communication band from the communication application program, a band information managing table for storing the obtained communication attribute, a band information transmitting module for delivering the band information of the local node to all the other nodes connected with the network, a band information receiving module for receiving the band information delivered by the band information transmitting module of another node and storing the band information in the band information managing table. The transmission rate control module is served to obtain the current band traffic on the basis of the band information stored in the band information managing table and perform the band control.

Network system and communication band control method thereof

An information processing system capable of performance measurement by the use of a small amount of mounted hardware. The information processing system having central processors installed therein comprises a control circuit, and a performance measurement validation register for specifying whether a performance measurement function is valid or invalid. In a case where the validity of the measurement function has been specified by the register, the control circuit operates one loop in a duplex configuration as a performance measurement facility. At this time, counter #1-counter #3 are used as counters for totalizing performance information. On the other hand, in a case where the invalidity of the measurement function has been specified, both loops in the duplex configuration are operated as the central processors. At this time, the counter #1-the counter #3 are used as timer counters for controlling buses.

Information processing system having performance measurement capabilities

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Hitachi, Japan

Atsushi Matsuno