Part I: Parallel Computer System Architectures COW: Cluster of workstations s MIMD, NUMA, coarse grain. w Distributed memory c Each node of Co w is a complete computer( SMP or PC)sometimes called headless workstation e A low-cost commodity network. e There is always a local disk. g A complete os resides on each node, whereas MPP only a microkernel exists g Examples: Berkeley now alpha Farm, FXCOWetc c Typical Sturcture: MB P/C P/C M M Bridge Bridge LD IOB LD IOB NIC NIC Commercial Networks(Ethernet, ATM etc.) NHPCC(Hefei)·USTC· CHINA glchenaustc edu.ci I-10NHPCC(Hefei) •USTC •CHINA glchen@ustc.edu.cn COW : Cluster Of Workstations + MIMD , NUMA , coarse grain. + Distributed memory. + Each node of COW is a complete computer ( SMP or PC) sometimes called headless workstation. + A low-cost commodity network. + There is always a local disk. + A complete OS resides on each node , whereas MPP only a microkernel exists. + Examples : Berkeley NOW ,Alpha Farm ,FXCOW etc. + Typical Sturcture : Part I : Parallel Computer System Architectures 1 -10 LD P/C M MB IOB LD P/C M MB IOB Commercial Networks(Ethernet,ATM etc.) Bridge NIC NIC Bridge