36 lines
909 B
C++
36 lines
909 B
C++
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/**
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* Compile
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* mpic++ MPI_hello_world.cpp -std=c++17 -Wall -pedantic -Wpedantic
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* Usage
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* mpirun -n 4 ./a.out
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*
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* Note: An easy way to finde the location of the `mpi.h` file is
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* mpic++ --showme:compile
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* which might be usefull to configure the intelicense.
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*/
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#include <iostream>
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#include <mpi.h>
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int main(int argn, char* argv[]) {
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// Initialize MPI (always required)
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MPI_Init(nullptr, nullptr);
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// Allocate MPI Settings
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int num_proc; /*< Number of processes */
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int rank; /*< This process rank (a.k.a. the MPI process ID) */
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// Set/Get MPI Settings
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MPI_Comm_size(MPI_COMM_WORLD, &num_proc);
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MPI_Comm_rank(MPI_COMM_WORLD, &rank);
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// Write MPI info to stdout
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std::cout << "Hello World, i am rank " << rank << " of " << num_proc
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<< " processes." << std::endl;
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// Shutdown MPI (always required)
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MPI_Finalize();
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return 0;
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}
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