Date: 2013-07-02T14:39:24+00:00

Actual source code: ex12.c
petsc-3.4.2 2013-07-02

      2: static char help[] = "Tests timing PetscSortInt().\n\n";

      4: #include <petscsys.h>

      8: int main(int argc,char **argv)
      9: {
     10:   PetscInt       i,n = 1000,*values;
     11:   int            event;
     12:   PetscRandom    rand;
     13:   PetscScalar    value;
     15:   PetscBool      values_view=PETSC_FALSE;
     16:   PetscMPIInt    rank;

     18:   PetscInitialize(&argc,&argv,(char*)0,help);
     19:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
     20:   PetscOptionsGetInt(NULL,"-n",&n,NULL);
     21:   PetscOptionsGetBool(0,"-values_view",&values_view,NULL);

     23:   PetscRandomCreate(PETSC_COMM_SELF,&rand);
     24:   PetscRandomSetFromOptions(rand);

     26:   PetscMalloc(n*sizeof(PetscInt),&values);
     27:   for (i=0; i<n; i++) {
     28:     PetscRandomGetValue(rand,&value);
     29:     values[i] = (PetscInt)(n*PetscRealPart(value) + 2.0);
     30:   }
     31:   PetscSortInt(n,values);

     33:   PetscLogEventRegister("Sort",0,&event);
     34:   PetscLogEventBegin(event,0,0,0,0);

     36:   for (i=0; i<n; i++) {
     37:     PetscRandomGetValue(rand,&value);
     38:     values[i] = (PetscInt)(n*PetscRealPart(value) + 2.0);
     39:   }
     40:   PetscSortInt(n,values);
     41:   PetscLogEventEnd(event,0,0,0,0);

     43:   for (i=1; i<n; i++) {
     44:     if (values[i] < values[i-1]) SETERRQ(PETSC_COMM_SELF,1,"Values not sorted");
     45:     if (values_view && !rank) {PetscPrintf(PETSC_COMM_SELF,"%d %d\n",i,values[i]);}
     46:   }
     47:   PetscFree(values);
     48:   PetscRandomDestroy(&rand);

     50:   PetscFinalize();
     51:   return 0;
     52: }