Abstract
The quality of service (QoS) is essential for a distributed data acquisition and control system. QoS depends on numerous factors, which are difficult to predict in advance. In this paper we present an empirical comparison of uni- and multicast based implementations of distributed middleware services. The LabMap middleware offers both uni- and multicast data distribution services. Unicast is based on TCP, multicast on the PGM streams. We measured the performance of both transport layers on the typical 1-n case where multicast deployment would be possible. Our study shows that PGM is a useful complement to TCP transport, though its use should be carefully planned in advance.
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