DS 642: Parallel Computing Lecture 6
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Questions and Answers

What is the purpose of synchronization in parallel computing?

  • To allocate memory efficiently for each thread
  • To speed up the execution of threads
  • To impose order constraints and protect access to shared data (correct)
  • To increase the number of threads running simultaneously

    • What does mutual exclusion achieve in parallel computing?

  • Ensures only one thread can enter a critical region at a time (correct)
  • Speeds up the execution of threads in a parallel environment
  • Allows multiple threads to access shared data simultaneously
  • Increases the chances of deadlock occurrence

    • What does the 'critical' keyword indicate in OpenMP parallel computing?

  • It speeds up the overall performance by minimizing synchronization
  • It allows threads to freely access shared resources without restrictions
  • It specifies a region where all threads must execute simultaneously
  • It signifies a region where only one thread can execute at a time (correct)

    • How does synchronization affect the performance of parallel programs?

    <p>Synchronization can introduce overhead but ensures correct execution order</p> Signup and view all the answers

    Why is mutual exclusion important in parallel computing systems?

    <p>To avoid conflicts that arise from simultaneous access to shared resources</p> Signup and view all the answers

    What is the primary purpose of using synchronization in parallel computing?

    <p>To impose order constraints and protect access to shared data</p> Signup and view all the answers

    In the context of parallel computing, what does 'critical' refer to?

    <p>A keyword used for mutual exclusion in critical regions</p> Signup and view all the answers

    Why is mutual exclusion important in parallel computing systems?

    <p>To ensure only one thread accesses a critical region at a time</p> Signup and view all the answers

    What does the OpenMP directive 'omp_get_thread_num()' return?

    <p>The ID of the current executing thread</p> Signup and view all the answers

    How does synchronization contribute to managing shared data in parallel programs?

    <p>By imposing order constraints and protecting shared data access</p> Signup and view all the answers

    In parallel computing, what is the purpose of using synchronization?

    <p>To ensure shared data is accessed in a specified order</p> Signup and view all the answers

    What is the main function of mutual exclusion in parallel computing systems?

    <p>To ensure only one thread at a time can enter a critical region</p> Signup and view all the answers

    What does the 'critical' keyword signify in OpenMP parallel computing?

    <p>It enforces mutual exclusion for shared data access</p> Signup and view all the answers

    Why do threads in parallel computing systems have to wait their turn?

    <p>To prevent multiple threads from accessing shared data simultaneously</p> Signup and view all the answers

    What is the significance of mutual exclusion in protecting shared data in parallel programs?

    <p>It ensures that shared data is always consistent across all threads</p> Signup and view all the answers

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