Operating System Mcqs

Page No. 62

If the thread pool contains no available thread ____________


athe server runs a new process

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bthe server goes to another thread pool

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cthe server demands for a new pool creation

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dthe server waits until one becomes free

✓



What is the idea behind thread pools?


aa number of threads are created at process startup and placed in a pool where they sit and wait for work

✓


bwhen a process begins, a pool of threads is chosen from the many existing and each thread is allotted equal amount of work

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call threads in a pool distribute the task equally among themselves

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dnone of the mentioned

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Each connection arriving at multi threaded servers via network is generally ____________


ais directly put into the blocking queue

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bis wrapped as a task and passed on to a thread pool

✓


cis kept in a normal queue and then sent to the blocking queue from where it is dequeued

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dnone of the mentioned

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Instead of starting a new thread for every task to execute concurrently, the task can be passed to a ___________


aprocess

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bthread pool

✓


cthread queue

✖


dnone of the mentioned

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View Answer thread pool

Thread pools are useful when ____________


awhen we need to limit the number of threads running in the application at the same time

✓


bwhen we need to limit the number of threads running in the application as a whole

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cwhen we need to arrange the ordering of threads

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dnone of the mentioned

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Working set model for page replacement is based on the assumption of ____________


amodularity

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blocality

✓


cglobalization

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drandom access

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View Answer locality

Which algorithm chooses the page that has not been used for the longest period of time whenever the page required to be replaced?


afirst in first out algorithm

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badditional reference bit algorithm

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cleast recently used algorithm

✓


dcounting based page replacement algorithm

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In FIFO page replacement algorithm, when a page must be replaced ____________


aoldest page is chosen

✓


bnewest page is chosen

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crandom page is chosen

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dnone of the mentioned

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View Answer oldest page is chosen

Effective access time is directly proportional to ____________


apage-fault rate

✓


bhit ratio

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cmemory access time

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dnone of the mentioned

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View Answer page-fault rate

When a program tries to access a page that is mapped in address space but not loaded in physical memory, then ____________


asegmentation fault occurs

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bfatal error occurs

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cpage fault occurs

✓


dno error occurs

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View Answer page fault occurs

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