Actual source code: PetscMemzero.c
petsc-3.7.1 2016-05-15
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      2: #include <petscsys.h>
      3: #include <petsctime.h>

      7: int main(int argc,char **argv)
      8: {
      9:   PetscLogDouble x,y,z;
     10:   PetscScalar    A[10000];
     11:   int            ierr;

     13:   PetscInitialize(&argc,&argv,0,0);
     14:   /* To take care of paging effects */
     15:   PetscMemzero(A,sizeof(PetscScalar)*0);
     16:   PetscTime(&x);

     18:   PetscTime(&x);
     19:   PetscMemzero(A,sizeof(PetscScalar)*10000);
     20:   PetscMemzero(A,sizeof(PetscScalar)*10000);
     21:   PetscMemzero(A,sizeof(PetscScalar)*10000);
     22:   PetscMemzero(A,sizeof(PetscScalar)*10000);
     23:   PetscMemzero(A,sizeof(PetscScalar)*10000);
     24:   PetscMemzero(A,sizeof(PetscScalar)*10000);
     25:   PetscMemzero(A,sizeof(PetscScalar)*10000);
     26:   PetscMemzero(A,sizeof(PetscScalar)*10000);
     27:   PetscMemzero(A,sizeof(PetscScalar)*10000);
     28:   PetscMemzero(A,sizeof(PetscScalar)*10000);
     29:   PetscTime(&y);
     30:   PetscMemzero(A,sizeof(PetscScalar)*0);
     31:   PetscMemzero(A,sizeof(PetscScalar)*0);
     32:   PetscMemzero(A,sizeof(PetscScalar)*0);
     33:   PetscMemzero(A,sizeof(PetscScalar)*0);
     34:   PetscMemzero(A,sizeof(PetscScalar)*0);
     35:   PetscMemzero(A,sizeof(PetscScalar)*0);
     36:   PetscMemzero(A,sizeof(PetscScalar)*0);
     37:   PetscMemzero(A,sizeof(PetscScalar)*0);
     38:   PetscMemzero(A,sizeof(PetscScalar)*0);
     39:   PetscMemzero(A,sizeof(PetscScalar)*0);
     40:   PetscTime(&z);

     42:   fprintf(stdout,"%s : \n","PetscMemzero");
     43:   fprintf(stdout,"    %-15s : %e sec\n","Latency",(z-y)/10.0);
     44:   fprintf(stdout,"    %-15s : %e sec\n","Per PetscScalar",(2*y-x-z)/100000.0);

     46:   PetscFinalize();
     47:   return(0);
     48: }