A LOAD DISTRIBUTION POLICY FOR A NEW TRANSCATION SERVICE CONSIDERING THE PRE-LOADED SERVICES by

In this paper, we describe and evaluate our load distribution policy. This policy makes placement decisions for processes of each service in such a way that the estimated response time is optimized while the estimated throughput is in the range that the user desires. Our target service is a transaction service consisting of multiple processes that communicate with each other. Our target system is a distributed system consisting of workstations connected by a local area network. The outstanding feature of our policy is that it takes account of pre-loaded services, ones for which process allocation has already been determined before the newly arrived service. In other words, our policy tries to keep the performance of the pre-loaded services at a desirable level while the newly arrived service processes are loaded and run. We measured the response time and the throughput when the process allocation is determined using our policy, and we compared them with those our policy estimates. The results show that our policy provides an appropriate process allocation, and that calculated results agree well with the measured ones.