Monday, January 11, 2016

Improve cache performance: matrix multiplication as an example


It is surprising to see mul1() is 10 times slower than mul2().

Mul2: By using j as the inner loop, C[i][j] & B[k][j] have good cache hits, while A[i][k] is a constant during the inner loop.

Mul1: In the inner loop, C[i][j] has a constant address, and A[i][k] has good cache hits; however B[k][j] is doomed to cache misses.

There are other methods to optimize matrix multiplication, but this one should be the most significant.


reference slide: https://www.cs.duke.edu/courses/fall06/cps220/lectures/PPT/lect12.pdf

 #include <iostream>  
 #include <stdlib.h>  
 #include <time.h>  
 using namespace std;  
 const int N = 2000;  
 double A[N][N], B[N][N], C[N][N];  
 void fill()  
 {  
  for (int i=0; i<N; i++)  
   for (int j=0; j<N; j++) {  
    A[i][j] = (double)rand() / RAND_MAX;  
    C[i][j] = 0;  
   }  
 }  
 void mul1()  
 {  
  for (int i=0; i<N; i++)   
   for (int j=0; j<N; j++)  
    for (int k=0; k<N; k++)  
      C[i][j] += A[i][k] * B[k][j];  
 }  
 void mul2()  
 {  
  for (int i=0; i<N; i++)  
   for (int k=0; k<N; k++)  
    for (int j=0; j<N; j++)  
      C[i][j] += A[i][k] * B[k][j];  
 }  
 int main()  
 {  
  fill();  
  clock_t startTime;  
  startTime = clock();  
  mul1();  
  cout << (clock() - startTime)/(double) CLOCKS_PER_SEC << endl;  
  startTime = clock();  
  mul2();  
  cout << (clock() - startTime)/(double) CLOCKS_PER_SEC << endl;  
  return 0;  
 }  
 /*  
 > g++ mul.cpp -O2  
 > a.exe  
 87.64  
 7.584  
 */  

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