Exploring the Use of a Reliable IP Multicast to Distribute BaBar's Online Event Processing and Filter Software to a Large Number of Farm Machines

摘要

Currently, the problem at hand is in distributing identical copies of OEP and filter software to a large number of farm nodes. One of the common methods used to transfer these softwares is through unicast. Unicast protocol faces the problem of repetitiously sending the same data over the network. Since the sending rate is limited, this process poses to be a bottleneck. Therefore, one possible solution to this problem lies in creating a reliable multicast protocol. A specific type of multicast protocol is the Bulk Multicast Protocol. This system consists of one sender distributing data to many receivers. The sender delivers data at a given rate of data packets. In response to that, the receiver replies to the sender with a status packet which contains information about the packet loss in terms of Negative Acknowledgment. The probability of the status packet sent back to the sender is +, where N is the number of receivers. The protocol is designed to have approximately 1 status packet for each data packet sent.