Evaluation of Gigabit Ethernet with Java / HORB

We h a ve e v aluated a high speed network, Gigabit Ethernet(GbE), with Java/HORB, which means Java and Java-based Distributed Object Technology(DOT). Next generation of data acquisition(DAQ) needs high speed network such a s A TM and GbE for data transfer in Level 3 and/or Level 2 trigger of the DAQ at large scale DAQ system like Large Hadron Collider(LHC). When evaluating the basic parameters of GbE, we considered bottleneck of network performance such as TCP buer size, memory access speed, Maximum Transmission Unit(MTU) and so on. We used network tools called TTCP and Netperf and some Java benchmark programs for evaluating DOTs, namely, HORB, RMI and Voyager. Linux and Windows/NT operating systems Client Computer SW Network Interface Card Gigabit Ethernet Server Computer FIGURE 1. Setup for performance evaluation on PC computers, and Solaris on UltraSPARC w orkstation were used. MTU had an important role of the data transfer. When 2 Ultra30/Solaris systems via GbE were used, the speed with MTU of 9000 bytes was over 500 Mbit/s(over 60 MB/s) and twice faster than that of 1500 bytes. In evaluation of remote method call as DAQ message path, HORB performance was twice faster than that of RMI and 3 times faster than that of Voyager. In the byte array transfer as DAQ data path, HORB performance was twice faster than that of RMI and Voyager. HORB Serialization was also twice faster than built-in JDK Serialization.