A file is a fixed resource
Which of these are true?
A server which is aware of which clients have a file cached is stateful
Servers which obtain their state from cookies are stateful
Stateful servers makes it more difficult to handle failures
A stateless server can change its own state without informing clients
Why would you use a thread over a process?
Because threads share the address space and therefore have lower overhead to start
To provide total isolation between different tasks within a process
Because processes can only be used for weak consistency
Because threads do not require state saving when interrupted
What is a solution to "a target machine may not be able to execute original code" in the context of code migration
Interpreted languages running on a virtual machine
Passing the code by reference
Dynamically reconfiguring the target system
Using a cloud computing platform instead
It is possible to migrate a fastened resource
What is the purpose of interceptors
To change flow of control and allow additional code to be executed
To block unauthorized or excessive RPC traffic
To update the code with new versions
To support binary encoding
Which of these is an accurate description of a thread?
Abstraction of activity within process
An isolated task containing an independent address space
An abstract task that can be passed between nodes within a distributed system over a network
The owner of a process
How can threading improve performance for clients?
Hide network latency by reacting to next request while previous being transmitted
By migrating the thread to the client machine which is more powerful
Because threaded servers perform better with threaded clients
It doesn't, threads are vulnerable to blocking execution
Which of these is not a reason to use code migration?
Reduce communication
Continue when disconnected
Dynamically deploy components
Because .NET is only supported on Windows platforms
Because I do not trust the code and wish to run it on an isolated system
Because the product of the code is larger than the code itself
Because the client is much more powerful than the server
Because the same code will be used many times over and over time the data produced by the code will exceed the size of the code
Switching between threads is more expensive than switching between processes
What are core OS functions?
Process, thread, communication and memory management
Process, thread, reliability and memory management
Security, IPC, threading and recovery
Concurrency, resource isolation, communication and memory management
Which of these are true about single threaded servers?
Prevents simple scaling to multiprocessor
Can only serve multiple concurrent clients if those clients are threaded
Generally perform faster by avoiding context switching
Does not scale up to serving many clients
