1 /*$Id: PetscMemzero.c,v 1.15 2000/11/28 17:32:38 bsmith Exp bsmith $*/ 2 3 #include "petsc.h" 4 5 #undef __FUNC__ 6 #define __FUNC__ "main" 7 int main(int argc,char **argv) 8 { 9 PetscLogDouble x,y,z; 10 Scalar A[10000]; 11 int ierr; 12 13 PetscInitialize(&argc,&argv,0,0); 14 /* To take care of paging effects */ 15 ierr = PetscMemzero(A,sizeof(Scalar)*0);CHKERRA(ierr); 16 ierr = PetscGetTime(&x);CHKERRA(ierr); 17 18 ierr = PetscGetTime(&x);CHKERRA(ierr); 19 ierr = PetscMemzero(A,sizeof(Scalar)*10000);CHKERRA(ierr); 20 ierr = PetscMemzero(A,sizeof(Scalar)*10000);CHKERRA(ierr); 21 ierr = PetscMemzero(A,sizeof(Scalar)*10000);CHKERRA(ierr); 22 ierr = PetscMemzero(A,sizeof(Scalar)*10000);CHKERRA(ierr); 23 ierr = PetscMemzero(A,sizeof(Scalar)*10000);CHKERRA(ierr); 24 ierr = PetscMemzero(A,sizeof(Scalar)*10000);CHKERRA(ierr); 25 ierr = PetscMemzero(A,sizeof(Scalar)*10000);CHKERRA(ierr); 26 ierr = PetscMemzero(A,sizeof(Scalar)*10000);CHKERRA(ierr); 27 ierr = PetscMemzero(A,sizeof(Scalar)*10000);CHKERRA(ierr); 28 ierr = PetscMemzero(A,sizeof(Scalar)*10000);CHKERRA(ierr);, 29 ierr = PetscGetTime(&y);CHKERRA(ierr); 30 ierr = PetscMemzero(A,sizeof(Scalar)*0);CHKERRA(ierr); 31 ierr = PetscMemzero(A,sizeof(Scalar)*0);CHKERRA(ierr); 32 ierr = PetscMemzero(A,sizeof(Scalar)*0);CHKERRA(ierr); 33 ierr = PetscMemzero(A,sizeof(Scalar)*0);CHKERRA(ierr); 34 ierr = PetscMemzero(A,sizeof(Scalar)*0);CHKERRA(ierr); 35 ierr = PetscMemzero(A,sizeof(Scalar)*0);CHKERRA(ierr); 36 ierr = PetscMemzero(A,sizeof(Scalar)*0);CHKERRA(ierr); 37 ierr = PetscMemzero(A,sizeof(Scalar)*0);CHKERRA(ierr); 38 ierr = PetscMemzero(A,sizeof(Scalar)*0);CHKERRA(ierr); 39 ierr = PetscMemzero(A,sizeof(Scalar)*0);CHKERRA(ierr); 40 ierr = PetscGetTime(&z);CHKERRA(ierr); 41 42 fprintf(stdout,"%s : \n","PetscMemzero"); 43 fprintf(stdout," %-11s : %e sec\n","Latency",(z-y)/10.0); 44 fprintf(stdout," %-11s : %e sec\n","Per Scalar",(2*y-x-z)/100000.0); 45 46 PetscFinalize(); 47 PetscFunctionReturn(0); 48 } 49