COMPUTER NETWORK SYSTEM AND SYSTEM PERFORMANCE TUNING METHOD THEREFOR

PURPOSE:To easily and efficiently tune a communication in a local computer or between other computers in a computer system wherein plural computers are connected by a network. CONSTITUTION:In the computer network system wherein the computers 1, 2, and 3 are connected to the network 4 and has plural transaction programs A1-A5 and plural communication programs 01 and 02 having different features and a communication is made in the local computers or between other computers, each computer has a communication management part 5 which provides a common interface having nondepenency on the different features of the communication programs and is further equipped with a maintenance information acquisition part 6 which acquires maintenance information including the actuation frequencies of the transaction programs and CPU use rates, an OCP selection reference setting part 7 which sets the permissible memory resource capacities of the communication programs and evaluated values of the communication programs, and an OCP automatic selection part 8 which determines which communication program each transaction program is assigned to according to information from the maintenance information acquisition part and OCP selection reference setting part.