Outubro 2008
Prof. Ismael H. F. Santos -  ismael@tecgraf.puc-rio.br                                                          2
Comparison between Systems
nA comparison between multiprocessor operating systems, multicomputer operating systems, network operating systems, and middleware based distributed systems.
Open
Open
Closed
Closed
Openness
Varies
Yes
Moderately
No
Scalability
Per node
Per node
Global, distributed
Global, central
Resource management
Model specific
Files
Messages
Shared memory
Basis for communication
N
N
N
1
Number of copies of OS
No
No
Yes
Yes
Same OS on all nodes
High
Low
High
Very High
Degree of transparency
Multicomp.
Multiproc.
Middleware-based OS
Network OS
Distributed OS
Item