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#include "mpi.h" #include <vector> #include <iostream> #include <fstream> using namespace std; void create_file() { ofstream myfile; myfile.open ("file.txt"); for (int i = 0; i < 1000; i++) { myfile << i << " "; } myfile.close(); } char buf[100]; int main(int argc, char **argv) { int size; create_file(); int rank; MPI_Init(&argc, &argv); MPI_File fh; MPI_Comm_size(MPI_COMM_WORLD, &size); MPI_Comm_rank(MPI_COMM_WORLD, &rank); MPI_File_open(MPI_COMM_WORLD, "file.txt", MPI_MODE_RDONLY, MPI_INFO_NULL, &fh); MPI_File_set_view(fh, rank*100, MPI_CHAR, MPI_CHAR, "native", MPI_INFO_NULL); MPI_File_read_all(fh, buf, 100, MPI_CHAR, MPI_STATUS_IGNORE); printf("process %d, buf=%s\n", rank, buf); MPI_File_close(&fh); remove("file.txt"); MPI_Finalize(); }
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