Distributed Systems and Cloud Computing: MPI Core Functions

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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?

The dependence on certain events for completion Signup and view all the answers

What is the purpose of the MPI_Comm_size function in MPI?

To get the size of a communicator Signup and view all the answers

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

To send a message to another process Signup and view all the answers

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

The type of each element in the message buffer Signup and view all the answers

What is the purpose of the MPI_Status object?

To provide information about the received message Signup and view all the answers

What is the function of MPI_Get_count?

To get the number of elements received in a message Signup and view all the answers

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

They can increase performance by overlapping computation with communication Signup and view all the answers

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

To ensure the buffer is free for reuse Signup and view all the answers

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

To get your program working using blocking communication Signup and view all the answers

What is the main purpose of the MPI_Bcast function?

To send data from the root process to all other processes Signup and view all the answers

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

They receive the data variable from the root process Signup and view all the answers

What is the purpose of the MPI_Barrier function?

To synchronize all processes in a group Signup and view all the answers

What is the main purpose of the MPI_Reduce function?

To perform a reduction operation on data Signup and view all the answers

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

To specify the operation to be performed on the data Signup and view all the answers

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

To specify the group of processes involved in the operation Signup and view all the answers

What is the main purpose of the MPI_Bcast function?

To send the same data to all processes in a communicator Signup and view all the answers

What is the difference between MPI_Scatter and MPI_Gather?

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

What is the purpose of the MPI_Irecv function?

To receive a message from a specific process Signup and view all the answers

What is the difference between MPI_Alltoall and MPI_Alltoallv?

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

When is broadcasting commonly used in parallel programming?

When sending user input to a parallel program Signup and view all the answers

What is the purpose of the MPI_Isend function?

To send a message to a specific process Signup and view all the answers

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?

What is the purpose of the MPI_Comm_rank function in MPI?

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

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

What is the purpose of the MPI_Comm_size function in MPI?

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

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

What is the purpose of the MPI_Status object?

What is the function of MPI_Get_count?

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

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

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

What is the main purpose of the MPI_Bcast function?

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

What is the purpose of the MPI_Barrier function?

What is the main purpose of the MPI_Reduce function?

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

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

What is the main purpose of the MPI_Bcast function?

What is the difference between MPI_Scatter and MPI_Gather?

What is the purpose of the MPI_Irecv function?

What is the difference between MPI_Alltoall and MPI_Alltoallv?

When is broadcasting commonly used in parallel programming?

What is the purpose of the MPI_Isend function?

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