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Additional info for Distributed Systems
24 How could an interrupt be communicated to a user-level server? 24 Ans. The interrupt handler creates a message and sends it, using a special non-blocking primitive, to a predetermined port which the user-level server owns. 25 On a certain computer we estimate that, regardless of the OS it runs, thread scheduling costs about 50 µs, a null procedure call 1 µs, a context switch to the kernel 20 µs and a domain transition 40 µs. For each of Mach and SPIN, estimate the cost to a client of calling a dynamically loaded null procedure.
The class Class has method getMethod whose arguments give class name and an array of parameter types. The proxy’s vote method, should have the same parameters as the vote in the remote interface - that is: two parameters of type String and int. Get the object representing the vote method from the class Election and pass it as the second argument of doOperation. The two arguments of vote are converted to an array of byte and passed as the third argument of doOperation. 3. 12. 9 Ans. g. g. g. g. vote = 1, result = 2.
The NFS mount service operates at system boot time or user login time at each workstation, mounting filesystems wholesale in case they will be used during the login session. This was found too cumbersome for some applications and produces large numbers of unused entries in mount tables. With the Automounter filesystems need not be mounted until they are accessed. This reduces the size of mount tables (and hence the time to search them). A simple form of filesystem replication for read-only filesystems can also be achieved with the Automounter, enabling the load of accesses to frequently-used system files to be shared between several NFS servers.