Abstract

. We have developed a new communication library, called PM, for the Myrinet gigabit LAN card, that has a dedicated processor and on-board memory to handle a communication protocol. In order to obtain high performance communication and support a multi-user environment, we have co-desgined PM, an operating system realized by a daemon process, and the run-time routine for a programming language. Several unique features, e.g., network context switching and modified ACK/NACK flow control algorithm have been developed for PM. The PM library has been implemented on two types of clusters: Sun Sparc station model 20/71 workstations and Intel Pentium based PCs. PM for the Suns has a speed of 20 ¯seconds round trip for a user-level 8 bytes message and 38.6 Mbytes/second bandwidth for an 8 Kbytes message. The result of a NAS parallel benchmark shows that a Sparc 20 workstation cluster achieves almost the same performance as Cray T3D. 1 Introduction It has become possible to cluster high-performa...

Citations