Unformatted text preview: rating system (the operating systems of
different computers may be the same or different), and there is essentially no
coordination at all among the computers except for the rule that when two
processes of different computers communicate with each other, they must use a
mutually agreed on communication protocol. Each computer functions
independently of other computers in the sense that each one makes independent decisions about the creation and termination of their own processes and
management of local resources. Notice that due to the possibility of difference in
local operating systems, the system calls for different computers of the same
distributed computing system may be different in this case.
On the other hand, with a distributed operating system, there is a single systemwide operating system and each computer of the distributed computing system
runs a part of this global operating system. The distributed operating system
tightly interweaves all the computers of the distributed computing system in the
sense that they work in close cooperation with each other for the efficient and
effective utilization of the various resources of the system. That is, processes and
several resources are managed globally (some resources are managed locally).
Moreover, there is a single set of globally valid system calls available on all
computers of the distributed computing system.
3. Fault tolerance capability. A network operating system provides little or no
fault tolerance capability in the sense that if 10% of the machines of the entire
distributed computing system are down at any moment, at least 10% of the users
are unable to continue with their work. On the other hand, with a distributed
operating system, most of the users are normally unaffected by the failed machines
and can continue to perform their work normally, with only a 10% loss in
performance of the entire distributed computing system. Therefore, the fault
tolerance capability of a distributed operating system is usually very high as
compared to that of a network operating system.
In short, both network operating systems and distr...
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This document was uploaded on 04/07/2014.
- Spring '14