1 #ifndef lint 2 static char vcid[] = "$Id: MPI_Wtime.c,v 1.3 1996/03/06 17:40:32 balay Exp $"; 3 #endif 4 5 #include "stdio.h" 6 #include "petsc.h" 7 8 int main( int argc, char **argv) 9 { 10 double x, y,z; 11 int A[10000], B[10000]; 12 13 PetscInitialize(&argc, &argv,0,0,0); 14 for (i=0; i<10000; i++) { 15 A[i] = i%61897; 16 B[i] = i%61897; 17 } 18 /* To take care of paging effects */ 19 PetscMemcpy(A,B,sizeof(int)*10000); 20 x = PetscGetTime(); 21 22 x = PetscGetTime(); 23 PetscMemcpy(A,B,sizeof(int)*10000); 24 PetscMemcpy(A,B,sizeof(int)*10000); 25 PetscMemcpy(A,B,sizeof(int)*10000); 26 PetscMemcpy(A,B,sizeof(int)*10000); 27 PetscMemcpy(A,B,sizeof(int)*10000); 28 PetscMemcpy(A,B,sizeof(int)*10000); 29 PetscMemcpy(A,B,sizeof(int)*10000); 30 PetscMemcpy(A,B,sizeof(int)*10000); 31 PetscMemcpy(A,B,sizeof(int)*10000); 32 PetscMemcpy(A,B,sizeof(int)*10000); 33 y = PetscGetTime(); 34 PetscMemcpy(A,B,sizeof(int)*0); 35 PetscMemcpy(A,B,sizeof(int)*0); 36 PetscMemcpy(A,B,sizeof(int)*0); 37 PetscMemcpy(A,B,sizeof(int)*0); 38 PetscMemcpy(A,B,sizeof(int)*0); 39 PetscMemcpy(A,B,sizeof(int)*0); 40 PetscMemcpy(A,B,sizeof(int)*0); 41 PetscMemcpy(A,B,sizeof(int)*0); 42 PetscMemcpy(A,B,sizeof(int)*0); 43 PetscMemcpy(A,B,sizeof(int)*0); 44 z = PetscGetTime(); 45 46 fprintf(stderr,"%s : \n","PetscMemcpy"); 47 fprintf(stderr," %-11s : %e sec\n","Latency",(z-y)/10.0); 48 fprintf(stderr," %-11s : %e sec\n","Per byte",(2*y-x-z)/100000.0); 49 50 PetscFinalize(); 51 return 0; 52 } 53