Actual source code: ex1.c
petsc-3.10.5 2019-03-28
2: static char help[] = "Tests PetscRandom functions.\n\n";
4: #include <petscsys.h>
6: /* Usage:
7: mpiexec -n <np> ./ex1 -n <num_of_random_numbers> -random_type <type> -log_view
8: -view_randomvalues <view_rank>
9: -random_view ascii -random_view :filename
10: */
12: int main(int argc,char **argv)
13: {
14: PetscInt i,n = 1000,*values;
15: PetscRandom rnd;
16: PetscScalar value,avg = 0.0;
18: PetscMPIInt rank;
19: PetscInt view_rank=-1;
20: #if defined(PETSC_USE_LOG)
21: PetscLogEvent event;
22: #endif
24: PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
25: MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
26: PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
27: PetscOptionsGetInt(NULL,NULL,"-view_randomvalues",&view_rank,NULL);
29: PetscRandomCreate(PETSC_COMM_WORLD,&rnd);
30: /* force imaginary part of random number to always be zero; thus obtain reproducible results with real and complex numbers */
31: PetscRandomSetInterval(rnd,0.0,1.0);
32: PetscRandomSetFromOptions(rnd);
34: PetscMalloc1(n,&values);
35: for (i=0; i<n; i++) {
36: PetscRandomGetValue(rnd,&value);
37: avg += value;
38: if (view_rank == (PetscInt)rank) {
39: PetscPrintf(PETSC_COMM_SELF,"[%d] value[%D] = %6.4e\n",rank,i,(double)PetscRealPart(value));
40: }
41: values[i] = (PetscInt)(n*PetscRealPart(value) + 2.0);
42: }
43: avg = avg/((PetscReal)n);
44: if (view_rank == (PetscInt)rank) {
45: PetscPrintf(PETSC_COMM_SELF,"[%d] Average value %6.4e\n",rank,(double)PetscRealPart(avg));
46: }
48: PetscSortInt(n,values);
50: PetscLogEventRegister("Sort",0,&event);
51: PetscLogEventBegin(event,0,0,0,0);
53: PetscRandomSeed(rnd);
54: for (i=0; i<n; i++) {
55: PetscRandomGetValue(rnd,&value);
56: values[i] = (PetscInt)(n*PetscRealPart(value) + 2.0);
57: /* printf("value[%d] = %g\n",i,value); */
58: }
59: PetscSortInt(n,values);
60: PetscLogEventEnd(event,0,0,0,0);
62: for (i=1; i<n; i++) {
63: if (values[i] < values[i-1]) SETERRQ(PETSC_COMM_SELF,1,"Values not sorted");
64: }
65: PetscFree(values);
66: PetscRandomDestroy(&rnd);
68: PetscFinalize();
69: return ierr;
70: }
74: /*TEST
76: test:
78: test:
79: suffix: 2
80: nsize: 2
81: output_file: output/ex1_1.out
83: test:
84: suffix: 3
85: args: -view_randomvalues 0
87: TEST*/