Description

ISHAAN OHRI
18BCE0265

Aim:

Write a C program to use MPI_Reduce that divides the processors into the group to find the addition independently.

Hint. The function prototype is as follows:
MPI_Reduce( void* send_data, void* recv_data, int count,
MPI_Datatype datatype,
MPI_Op op, int root,
MPI_Comm communicator)

Source Code:

Execution:

Remarks:

int MPI_Reduce(const void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm)

In the above command
• sendbuf is the address of send buffer
• count is the number of elements in the send buffer
• datatype is the data type of elements of send buffer
• op is the reduce operation
• root is the rank of root process
• comm is the communicator
• recvbuf is the address of the receive buffer

Using MPI_Reduce, MPI process can apply a reduction calculation. The values sent by the MPI processes will be combined using the reduction operation given and the result will be stored on the MPI process specified as root.