Basic HTML version of Foils prepared 23 August 1998
Foil 33 Distributed Shared Memory Machines
From CPS615-Introduction-Course,Driving Technology and HPCC Current Status and Futures CPS615 Basic Simulation Track for Computational Science -- Fall Semester 98. byGeoffrey C. Fox, (Some Culler, Koelbel material)
Combining the (dis)advantages of shared and distributed memory
Lots of hierarchical designs are appearing.
Typically, "shared memory nodes" with 4 to 32 processors
Each processor has a local cache
Processors within a node access shared memory
Nodes can get data from or put data to other nodes' memories