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BlockingMMM.cpp
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BlockingMMM.cpp
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#include <iostream>
#include <cmath>
#include "PapiWrapper.h"
#include <papi.h>
#ifndef BLOCK_M
#define BLOCK_M 30
#endif
#ifndef BLOCK_P
#define BLOCK_P BLOCK_M
#endif
#ifndef BLOCK_N
#define BLOCK_N BLOCK_M
#endif
#ifndef BLOCK_NB
#define BLOCK_NB 10
#endif
#ifndef OUTPUT_ALL
#define OUTPUT_ALL 1
#endif
static void populateA(double a[BLOCK_M][BLOCK_N])
{
const int m = BLOCK_M;
const int n = BLOCK_N;
const int p = BLOCK_P;
const int minDim = std::min(m,n);
for (int z = 0; z < minDim; z++)
a[z][z] = 1;
}
static void populateB(double b[BLOCK_N][BLOCK_P])
{
const int m = BLOCK_M;
const int n = BLOCK_N;
const int p = BLOCK_P;
const int minDim = std::min(n,p);
for (int z = 0; z < minDim; z++)
b[z][z] = 1;
}
static void printA(double a[BLOCK_M][BLOCK_N])
{
const int m = BLOCK_M;
const int n = BLOCK_N;
const int p = BLOCK_P;
std::cout << "A: = " <<std::endl;
for (int i=0; i < m; i++)
{
for (int k=0; k < n; k++)
{
std::cout << a[i][k]<< " " ;
}
std::cout << std::endl;
}
std::cout << std::endl;
}
static void printB(double b[BLOCK_N][BLOCK_P])
{
const int m = BLOCK_M;
const int n = BLOCK_N;
const int p = BLOCK_P;
std::cout << "B: = " <<std::endl;
for (int i=0; i < n; i++)
{
for (int k=0; k < p; k++)
{
std::cout << b[i][k]<< " " ;
}
std::cout << std::endl;
}
std::cout << std::endl;
}
static void printC(double c[BLOCK_M][BLOCK_P])
{
const int m = BLOCK_M;
const int n = BLOCK_N;
const int p = BLOCK_P;
std::cout << "C: = " <<std::endl;
for (int i=0; i < m; i++)
{
for (int k=0; k < p; k++)
{
std::cout << c[i][k]<< " " ;
}
std::cout << std::endl;
}
std::cout << std::endl;
}
static void editC(double c[BLOCK_M][BLOCK_P])
{
const int m = BLOCK_M;
const int n = BLOCK_N;
const int p = BLOCK_P;
double sum = 0.0;
for (int i=0; i < m; i++)
{
for (int k=0; k < p; k++)
{
sum += c[i][k];
}
}
std::cout << "Sum: " << sum << std::endl;
}
int main()
{
std::cout << "This is a blocking Matrix Matrix Multiply (MMM) example " << std::endl
<< "It takes matrix a and matrix b and creates matrix c. " << std::endl
<< std::endl;
const int outputValue = OUTPUT_ALL;
std::cout << "The output is: " << (outputValue? "on" : "off") << std::endl;
double a[BLOCK_M][BLOCK_N] = {0.0};
double b[BLOCK_N][BLOCK_P] = {0.0};
double c[BLOCK_M][BLOCK_P] = {0.0};
const int M = BLOCK_M;
const int N = BLOCK_N;
const int P = BLOCK_P;
const int NB = BLOCK_NB;
populateA(a);
populateB(b);
papiSetup();
papiStart();
for (int i=0; i < N; i+=NB)
for (int j=0; j < M; j+=NB)
for (int k=0; k < P; k+=NB)
for (int i0=i; i0 < (i+NB); i0++)
for (int j0=j; j0 < (j+NB); j0++)
for (int k0=k; k0 < (k+NB); k0++)
c[i0][j0] += a[i0][k0]*b[k0][j0];
papiFinish();
#if OUTPUT_ALL
printA(a);
printB(b);
printC(c);
#endif
papiPrintResults();
editC(c);
return 0;
}