Operating System Concepts: Amdahl's Law and Threads
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Operating System Concepts: Amdahl's Law and Threads

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Questions and Answers

What is a key difference between user threads and kernel threads?

  • User threads are used for parallel processing, while kernel threads are used for serial processing.
  • User threads are created by the user, while kernel threads are created by the kernel.
  • User threads are managed by the kernel, while kernel threads are managed by the user-level threads library.
  • User threads are managed by the user-level threads library, while kernel threads are supported by the kernel. (correct)
  • Which multithreading model maps multiple user-level threads to a single kernel thread?

  • Many-to-Many
  • One-to-One
  • One-to-Many
  • Many-to-One (correct)
  • What is the primary advantage of the One-to-One multithreading model?

  • It is more efficient in terms of resource usage.
  • It allows for more concurrency than the Many-to-One model. (correct)
  • It is more scalable than the Many-to-Many model.
  • It is easier to implement than the Many-to-Many model.
  • What is the purpose of a thread library?

    <p>To provide an API for creating and managing threads.</p> Signup and view all the answers

    Which of the following is an example of a thread library?

    <p>Pthreads</p> Signup and view all the answers

    What is the primary advantage of implicit threading?

    <p>It is easier to implement than explicit threading.</p> Signup and view all the answers

    What is the primary limitation of the Many-to-One multithreading model?

    <p>One thread blocking causes all to block.</p> Signup and view all the answers

    What is the role of the kernel in kernel threads?

    <p>The kernel supports kernel threads.</p> Signup and view all the answers

    What is the primary benefit of Amdahl's Law?

    <p>It predicts the maximum theoretical speedup that can be achieved by parallel processing.</p> Signup and view all the answers

    Which of the following is an example of implicit threading?

    <p>All of the above</p> Signup and view all the answers

    What is the primary advantage of thread creation over process creation?

    <p>It is a lighter-weight operation</p> Signup and view all the answers

    What is the primary objective of thread cancellation?

    <p>To terminate a thread before it has finished</p> Signup and view all the answers

    What is a key benefit of using multiple threads in a single process?

    <p>Threads share resources of the process</p> Signup and view all the answers

    What determines when a thread cancellation occurs?

    <p>The thread's state</p> Signup and view all the answers

    What is a major challenge in programming multicore systems?

    <p>Dividing tasks into threads</p> Signup and view all the answers

    What is the term for a system that can perform multiple tasks simultaneously?

    <p>Parallelism</p> Signup and view all the answers

    What is the purpose of thread-local storage (TLS)?

    <p>To allow each thread to have its own copy of data</p> Signup and view all the answers

    What is the benefit of multithreading in terms of responsiveness?

    <p>Better user interface responsiveness</p> Signup and view all the answers

    What is the default type of cancellation in pthreads?

    <p>Deferred cancellation</p> Signup and view all the answers

    How is thread cancellation handled on Linux systems?

    <p>Through signals</p> Signup and view all the answers

    What is the primary difference between kernels and user-level threads?

    <p>Kernel threads are managed by the kernel</p> Signup and view all the answers

    What happens when a thread has cancellation disabled?

    <p>Cancellation remains pending until the thread enables it</p> Signup and view all the answers

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