Distributed Systems and Cloud Computing: MPI Core Functions

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24 Questions

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

To initialize the MPI library

What is the purpose of the MPI_Comm_rank function in MPI?

To get the rank of the calling process in the communicator

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

MPI_Finalize

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

The dependence on certain events for completion

What is the purpose of the MPI_Comm_size function in MPI?

To get the size of a communicator

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

To send a message to another process

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

What is the purpose of the MPI_Status object?

To provide information about the received message

What is the function of MPI_Get_count?

To get the number of elements received in a message

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

They can increase performance by overlapping computation with communication

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

To ensure the buffer is free for reuse

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

To get your program working using blocking communication

What is the main purpose of the MPI_Bcast function?

To send data from the root process to all other processes

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

They receive the data variable from the root process

What is the purpose of the MPI_Barrier function?

To synchronize all processes in a group

What is the main purpose of the MPI_Reduce function?

To perform a reduction operation on data

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

To specify the operation to be performed on the data

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

To specify the group of processes involved in the operation

What is the main purpose of the MPI_Bcast function?

To send the same data to all processes in a communicator

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

What is the purpose of the MPI_Irecv function?

To receive a message from a specific process

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

When is broadcasting commonly used in parallel programming?

When sending user input to a parallel program

What is the purpose of the MPI_Isend function?

To send a message to a specific process

Test your knowledge of the core functions in Message Passing Interface (MPI), including MPI_Init, MPI_Comm_size, and MPI_Comm_rank. Understand how to use these functions to initialize the MPI library, get the size of a communicator, and get the rank of the calling process.

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