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PVM-SCI: A PVM Implementation for Heterogeneous SCI-Clusters

| We present PVM-SCI, an implementation of the PVM 3.4 message passing standard for workstation clusters with scalable coherent interface (SCI). PVM-SCI provides two complementary communication schemes: the usual UDP/IP protocol for messages sent via PVM daemons, and a fast communication protocol that has been implemented directly on top of SCI for messages sent with the PvmRouteDirect directive. No time-consuming protocol stack is used, thereby allowing for a low communication latency and a high message throughput. PVM-SCI is fault-tolerant and it also supports multiple interconnects, giving a convenient and e cient means for utilizing heterogeneous compute clusters. When SCI is available, PVM-SCI makes use of it, otherwise it automatically defaults to the slower Ethernet communication. PVM-SCI runs on Solaris, Linux and Windows NT.