330 lines
9.1 KiB
C++
330 lines
9.1 KiB
C++
#include <fstream>
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#include <iostream>
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#include <mpi.h>
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#include <vector>
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#include "Serialize_Deserialize_Vector.h"
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#define MCW MPI_COMM_WORLD
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using namespace std;
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int N;
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ofstream myfile;
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std::vector<std::vector<double> > A = std::vector<std::vector<double> >(0, std::vector<double>(0));
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std::vector<std::vector<double> > B = std::vector<std::vector<double> >(0, std::vector<double>(0));
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std::vector<std::vector<double> > AB = std::vector<std::vector<double> >(0, std::vector<double>(0));
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std::vector<std::vector<double> > AB_serial = std::vector<std::vector<double> >(0, std::vector<double>(0));
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void print_matrix(std::vector<std::vector<double> > mat);
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void serial_version();
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void compute_interval(int start, int interval);
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void multiplyMatrix(int rank, int size);
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void read_in_matrices();
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void print_help();
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void determinant();
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std::vector<std::vector<double> > read_in_single_matrix();
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void reduced_row();
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int main(int argc, char** argv) {
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int rank, size;
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MPI_Init(&argc, &argv);
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MPI_Comm_rank(MCW, &rank);
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MPI_Comm_size(MCW, &size);
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if(!rank)
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myfile.open ("results.txt");
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bool done = false;
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while (!done) {
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char user_input;
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if (!rank) {
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bool user_input_complete = false;
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while (!user_input_complete) {
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cout << "Enter your selection: \n\t 1=Matrix Multiplication \n\t 2=Reduced Row \n\t 3=Matrix Determinent \n\t h=help \n\t q=Exit"
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<< endl;
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cin >> user_input;
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if (user_input == 'h')
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print_help();
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else if (user_input == '1' || user_input == '2' || user_input == '3' ||
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user_input == 'q')
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user_input_complete = true;
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}
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}
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MPI_Barrier(MCW);
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MPI_Bcast(&user_input, 1, MPI_INT, 0, MCW );
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if (user_input == '1')
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multiplyMatrix(rank, size);
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else if (user_input == '2'){
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if(!rank)
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reduced_row();
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}
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else if (user_input == '3') {
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if (!rank)
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determinant();
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}
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else if (user_input == 'q')
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done = true;
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}
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myfile.close();
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MPI_Finalize();
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return 0;
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}
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void reduced_row() {
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cout << "Reduced Row: " << endl;
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myfile << "Reduced Row: " << endl;
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std::vector<std::vector<double> > M = read_in_single_matrix();
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int n = M.size();
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const double SMALL = 1.0E-30;
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for (int i = 0; i < n - 1; i++) {
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int r = i;
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double maxM = abs(M[i][i]);
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for (int k = i + 1; k < n; k++) {
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double val = abs(M[k][i]);
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if (val > maxM) {
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r = k;
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maxM = val;
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}
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}
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if (r != i)
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for (int j = i; j < n; j++)
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swap(M[i][j], M[r][j]);
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double pivot = M[i][i];
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if (abs(pivot) < SMALL) {
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print_matrix(M);
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return;
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}
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for (int rows = i + 1; rows < n; rows++) {
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double multiple = M[rows][i] / pivot;
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for (int j = i; j < n; j++)
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M[rows][j] -= multiple * M[i][j];
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}
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}
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print_matrix(M);
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}
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std::vector<std::vector<double> > read_in_single_matrix() {
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ifstream f("Matrix.txt");
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f >> N;
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// Allocate memory
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A.resize(N);
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for (int i = 0; i < N; ++i)
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A[i].resize(N);
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for (int i = 0; i < N; i++)
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for (int j = 0; j < N; j++)
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f >> A[i][j];
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return A;
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}
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void print_help(){
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cout << "Inputs-"
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"\n\t<1> Matrix Multiplication"
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"\n\t\t Matrix Multiplication runs both a parallel and serial implementation timing both results for comparison."
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"\n\t\t The read files first line should be the dimensions of the matricies being read and formatted as below:"
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"\n\t\t\t 3"
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"\n\t\t\t 1 2 3"
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"\n\t\t\t 4 5 6"
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"\n\t\t\t 7 8 9"
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"\n"
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"\n\t\t\t 9 8 7"
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"\n\t\t\t 6 5 4"
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"\n\t\t\t 3 2 1"
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"\n\n\t<2> Reduced Row"
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"\n\t\t Reduced row will preform row swaps to get the matrix into reduced row format."
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"\n\t\t The read files first line should be the dimensions of the matrix being read and formatted as below:"
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"\n\t\t\t 3"
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"\n\t\t\t 1 2 3"
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"\n\t\t\t 4 5 6"
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"\n\t\t\t 7 8 9"
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"\n\n\t<3> Matrix Determinent"
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"\n\t\t The Matrix determinant will be calculated by placing the matrix in reduced row format and then multiplying the pivot points."
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"\n\t\t The read files first line should be the dimensions of the matrix being read and formatted as below:"
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"\n\t\t\t 3"
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"\n\t\t\t 1 2 3"
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"\n\t\t\t 4 5 6"
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"\n\t\t\t 7 8 9"
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<<endl << endl;
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}
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void read_in_matrices() {
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ifstream f("Matrix.txt");
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f >> N;
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// Allocate memory
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A.resize(N);
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for (int i = 0; i < N; ++i)
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A[i].resize(N);
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B.resize(N);
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for (int i = 0; i < N; ++i)
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B[i].resize(N);
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AB.resize(N);
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for (int i = 0; i < N; ++i)
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AB[i].resize(N);
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AB_serial.resize(N);
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for (int i = 0; i < N; ++i)
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AB_serial[i].resize(N);
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for (int i = 0; i < N; i++)
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for (int j = 0; j < N; j++)
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f >> A[i][j];
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for (int i = 0; i < N; i++)
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for (int j = 0; j < N; j++)
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f >> B[i][j];
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for (int i = 0; i < N; i++)
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for (int j = 0; j < N; j++)
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AB[i][j] = 0;
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}
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void print_matrix(std::vector<std::vector<double> >mat) {
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for (int i = 0; i < N; i++){
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for (int j = 0; j<N; j++){
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cout << mat[i][j] << " ";
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myfile << mat[i][j] << " ";
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}
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cout << endl;
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myfile << endl;
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}
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myfile << endl;
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cout << endl;
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}
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void serial_version(){
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for (int i = 0; i <N; i++){
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for (int j = 0; j < N;j++){
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AB_serial[i][j] = 0;
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for (int k = 0; k <N; k++){
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AB_serial[i][j] += A[i][k]*B[k][j];
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}
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}
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}
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}
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void compute_interval(int start,int interval){
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for(int i = start; i <start+interval;i++){
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for (int j = 0; j <N; j++){
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AB[i][j] = 0;
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for (int k = 0; k <N; k++){
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AB[i][j] += A[i][k]*B[k][j];
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}
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}
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}
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}
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void multiplyMatrix(int rank, int size){
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double time1,time2,time3;
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if(!rank){
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read_in_matrices();
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}
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MPI_Bcast(&N, 1, MPI_INT, 0, MCW);
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if(rank) {
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A.resize(N);
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for (int i = 0; i < N; ++i)
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A[i].resize(N);
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B.resize(N);
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for (int i = 0; i < N; ++i)
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B[i].resize(N);
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AB.resize(N);
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for (int i = 0; i < N; ++i)
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AB[i].resize(N);
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}
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MPI_Barrier(MCW);
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int interval = N / size;
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int remainder = N % size;
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MPI_Bcast(&interval, 1, MPI_INT, 0, MCW);
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MPI_Bcast(&remainder, 1, MPI_INT, 0, MCW);
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// Record start time
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MPI_Barrier(MCW);
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time1 = MPI_Wtime();
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if (!rank) {
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compute_interval(size * interval, remainder);
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}
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std::vector<double> tmpB = std::vector<double>(N*N);
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tmpB = Serialize_Deserialize_Vector::Serialize(B);
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MPI_Bcast(&tmpB[0],N*N,MPI_DOUBLE,0,MCW);
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if(rank)
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B=Serialize_Deserialize_Vector::Deserialize(tmpB);
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std::vector<double> tmpA = std::vector<double>(N*N);
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tmpA = Serialize_Deserialize_Vector::Serialize(A);
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MPI_Bcast(&tmpA[0], N*N, MPI_DOUBLE, 0, MCW);
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if(rank)
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A=Serialize_Deserialize_Vector::Deserialize(tmpA);
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compute_interval(rank*interval,interval);
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std::vector<double> tmp_AB = Serialize_Deserialize_Vector::Serialize(AB);
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MPI_Gather(&tmp_AB[rank * interval*N], interval * N, MPI_DOUBLE, &tmp_AB[rank*interval*N],
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interval * N, MPI_DOUBLE, 0, MCW);
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AB=Serialize_Deserialize_Vector::Deserialize(tmp_AB);
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//Record parallel finish time
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MPI_Barrier(MCW);
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time2 = MPI_Wtime();
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if (!rank){
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serial_version();
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time3 = MPI_Wtime();
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cout << size << " processors computed in time: " << time2-time1 << endl;
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cout << "Serial version computed in time: " << time3-time2 << endl;
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cout << "Matrix A: " << endl;
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myfile << size << " processors computed in time: " << time2-time1 << endl;
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myfile << "Serial version computed in time: " << time3-time2 << endl;
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myfile << "Matrix A: " << endl;
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print_matrix(A);
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cout << "multiplied Matrix B:" << endl;
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myfile << "multiplied Matrix B:" << endl;
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print_matrix(B);
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cout << "serial version gives:" << endl;
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myfile << "serial version gives:" << endl;
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print_matrix(AB_serial);
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cout << "gives matrix AB:" << endl;
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myfile << "gives matrix AB:" << endl;
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print_matrix(AB);
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}
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}
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void determinant()
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{
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std::vector<std::vector<double> > M = read_in_single_matrix();
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int n = M.size();
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const double SMALL = 1.0E-30;
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double det = 1;
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for ( int i = 0; i < n - 1; i++ )
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{
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int r = i;
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double maxM = abs( M[i][i] );
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for ( int k = i + 1; k < n; k++ )
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{
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double val = abs( M[k][i] );
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if ( val > maxM )
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{
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r = k;
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maxM = val;
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}
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}
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if ( r != i )
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{
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for ( int j = i; j < n; j++ ) swap( M[i][j], M[r][j] );
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det = -det;
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}
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double pivot = M[i][i];
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if ( abs( pivot ) < SMALL ) {
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cout << "Determinant = " << M[0][0] << " for matrix: " <<endl;
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myfile << "Determinant = " << M[0][0] << " for matrix: " <<endl;
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print_matrix(M);
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return;
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}
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for ( int rows = i + 1; rows < n; rows++ )
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{
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double multiple = M[rows][i] / pivot;
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for ( int j = i; j < n; j++ ) M[rows][j] -= multiple * M[i][j];
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}
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det *= pivot;
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}
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det *= M[n-1][n-1];
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cout << "Determinant = " << det<< " for matrix: " <<endl;
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myfile << "Determinant = " << det<< " for matrix: " <<endl;
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print_matrix(M);
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}
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