Outubro 2008
Prof. Ismael H. F. Santos
- ismael@tecgraf.puc-rio.br
2
Motivation
nDistributed system is collection of loosely coupled processors interconnected by a communications
network
nProcessors called nodes,
computers, machines, hosts
nSite is
location of the processor
nReasons for distributed systems
nResource sharing
nsharing and printing files at remote sites
nprocessing information in a distributed database
nusing remote specialized hardware devices
nComputation speedup – load sharing
nReliability – detect and recover from site failure,
function transfer, reintegrate
failed site
nCommunication – message passing