Write a MPI program for calculating sum of first n integers using Remote Memory Access calls (Memory Windows) Use MPI RMA calls like MPI_Win_create, MPI_Win_fence, MPI_Win_free, MPI_Put. This is also referred as one-sided communication.

In this program, the root process exposes a window of memory which can hold n integers using MPI_Win_create where n is equal to the number of processes spawned. All other processes except root expose a zero-sized memory window. Each of the processes puts an integer using MPI_Put  ranging from 1 to n into the window exposed by root process. A process with rank MyRank puts an integer which is equal to MyRank+1 into the memory window exposed by the root process. The root process has the first n integers in its window after this step and calculates the sum of the integers accumulated and prints the sum.

There is no need of any input, the program automatically takes the number of processes spawned and calculates the sum of first n integers where n is equal to the number of processes.
 

The program prints the sum of n integers which are accumulated in the window exposed by the root process.

Write a MPI program spawning a process (dynamic process management)

In this programe, processes are created dynamically using MPI library calls MPI_Comm_spawn . MPI_Comm_spawn is a collective operation over the spawning process (called the parents ) and also collective with the calls to MPI_Init in the proceses that are spawned (called children ). The new process have their own MPI_COMM_WORLD. The function MPI_Comm_parent , called from the childern, returns an inter-communicators containing the children as the local group and the parents as the remote group. The MPI_Comm_spawn library call helps is creating another group of processes allowing the necessary communication infrastrcuture to he set up before any of the calls return.

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Rank of the Processes involved

Write a MPI program for computation of pie value by numerical intgration using Remote Meomory Access (RMA)

In this program, process 0 will store the value its reds from the user (command line arguement) into its part of an RMA window object, where the other processes can simply it. After the partial sum calculatios, all processes will add their contributions to a value in another window object, using accumulate . Each task in an intracommunicator group specify a "window" in its memory that is made accessible to accesses by remote tasks. At the beginning of the program, all the processes set up (Creation) window and the operation operation is invoked by the function MPI_Win_fence. The library calls MPI_Win_create, MPI_Win_fence , MPI_Put and MPI_Accumulate library calls are used to compute the value of pie.

Number of intervals as a command-line arguments.
 

Write a MPI-2 program to compute the Matrix into Vector Multiplication using Self-Scheduling Algorithm (Dynamic Process Management - MPI_Comm_spawn Library calls)

The algorithm for Matrix into Vector Multiplication using Self -Scheduling is same as discussed in MPI 1.X programs using Dense/Sparse Matrix Computations . In MPI-2.0, the master and the slave program are differnt but the master process only starts and start the slaves with MPI_Comm_spawn in the master program.

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Output Vector (Matrix into Vector Multiplication