Distributed Systems and Cloud Computing: MPI Core Functions
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Questions and Answers

What is the primary function of the MPI_Init routine in MPI?

  • To receive a message from another process
  • To initialize the MPI library (correct)
  • To get the size of a communicator
  • To send a message to another process

    • What is the purpose of the MPI_Comm_rank function in MPI?

  • To get the rank of the calling process in the communicator (correct)
  • To send a message to another process
  • To get the size of a communicator
  • To initialize the MPI library

    • Which of the following MPI functions is used to clean up all MPI state?

  • MPI_Finalize (correct)
  • MPI_Send
  • MPI_Comm_size
  • MPI_Recv

    • What is the primary difference between blocking and non-blocking communication functions in MPI?

    <p>The dependence on certain events for completion</p> Signup and view all the answers

    What is the purpose of the MPI_Comm_size function in MPI?

    <p>To get the size of a communicator</p> Signup and view all the answers

    What is the primary function of the MPI_Send routine in MPI?

    <p>To send a message to another process</p> Signup and view all the answers

    What type of data does the MPI_Datatype parameter in MPI_Send and MPI_Recv represent?

    <p>The type of each element in the message buffer</p> Signup and view all the answers

    What is the purpose of the MPI_Status object?

    <p>To provide information about the received message</p> Signup and view all the answers

    What is the function of MPI_Get_count?

    <p>To get the number of elements received in a message</p> Signup and view all the answers

    What is the main advantage of using non-blocking communication functions?

    <p>They can increase performance by overlapping computation with communication</p> Signup and view all the answers

    What is the responsibility of the programmer when using non-blocking communication functions?

    <p>To ensure the buffer is free for reuse</p> Signup and view all the answers

    What is recommended to do before attempting to use non-blocking communication functions?

    <p>To get your program working using blocking communication</p> Signup and view all the answers

    What is the main purpose of the MPI_Bcast function?

    <p>To send data from the root process to all other processes</p> Signup and view all the answers

    What is the role of the receiver processes when calling MPI_Bcast?

    <p>They receive the data variable from the root process</p> Signup and view all the answers

    What is the purpose of the MPI_Barrier function?

    <p>To synchronize all processes in a group</p> Signup and view all the answers

    What is the main purpose of the MPI_Reduce function?

    <p>To perform a reduction operation on data</p> Signup and view all the answers

    What is the role of the operation parameter in the MPI_Reduce function?

    <p>To specify the operation to be performed on the data</p> Signup and view all the answers

    What is the purpose of the communicator parameter in MPI collective communication functions?

    <p>To specify the group of processes involved in the operation</p> Signup and view all the answers

    What is the main purpose of the MPI_Bcast function?

    <p>To send the same data to all processes in a communicator</p> Signup and view all the answers

    What is the difference between MPI_Scatter and MPI_Gather?

    <p>MPI_Scatter splits data into equal segments, while MPI_Gather collects data into a single process</p> Signup and view all the answers

    What is the purpose of the MPI_Irecv function?

    <p>To receive a message from a specific process</p> Signup and view all the answers

    What is the difference between MPI_Alltoall and MPI_Alltoallv?

    <p>MPI_Alltoall sends a fixed amount of data, while MPI_Alltoallv sends a variable amount of data</p> Signup and view all the answers

    When is broadcasting commonly used in parallel programming?

    <p>When sending user input to a parallel program</p> Signup and view all the answers

    What is the purpose of the MPI_Isend function?

    <p>To send a message to a specific process</p> Signup and view all the answers

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