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The MPICH-SCore high performance communication library for cluster computing is integrated into the MPICH-G2 library in order to adapt PC clusters to a Grid environment. The integrated library is called MPICH-G2/SCore.In addition, for the purpose of comparison with other approaches, MPICH-SCore itself is extended to encapsulateits network packet into a UDP packet so that packets aredelivered via L3 switches. This extension is called UDP-encapsulated MPICH-SCore. In this paper, three implementations of the MPI library, UDP-encapsulated MPICH-SCore, MPICH-G2/SCore, and MPICH-P4, are evaluatedusing an emulated WAN environment where two clusters,each consisting of sixteen hosts,are connected by a routerPC. The router PC controls the latency of message delivery between clusters, and the added latency is varied from1 millisecond to 4 milliseconds in round-trip time. Experiments are performed using the NAS Parallel Benchmarks,which show UDP-encapsulated MPICH-SCore most oftenperforms better than other implementations. However, thedifferences are not critical for the benchmarks. The preliminary results show that the performance of the LU benchmark scales up linearly with under 4 millisecond round-triplatency. The CG and MG benchmarks show the scalabilityof 1.13 and 1.24 times with 4 millisecond round-trip latency,respectively.