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The ultimate measures of performance are the users’ perceptions of the performance of their networked applications (e.g. WWW, email, a distributed RDBMS, a spreadsheet accessing a distributed file system etc.)
This performance is affected by the performance of the complete Distributed System, which includes:
- physical network plant
- communications devices (e.g. routers, switches) , computers and peripherals attached to the network plant
- host resource utilization
- software from device interfaces, thru operating systems to applications running on computers and devices To set and meet user expectations for distributed system performance, we must monitor all of the above
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