1 2 static char help[] = "Tests PetscRandom functions.\n\n"; 3 4 #include <petscsys.h> 5 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 */ 11 12 int main(int argc, char **argv) 13 { 14 PetscInt i, n = 1000, *values; 15 PetscRandom rnd; 16 PetscScalar value, avg = 0.0; 17 PetscMPIInt rank; 18 PetscInt view_rank = -1; 19 #if defined(PETSC_USE_LOG) 20 PetscLogEvent event; 21 #endif 22 23 PetscFunctionBeginUser; 24 PetscCall(PetscInitialize(&argc, &argv, (char *)0, help)); 25 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 26 PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL)); 27 PetscCall(PetscOptionsGetInt(NULL, NULL, "-view_randomvalues", &view_rank, NULL)); 28 29 PetscCall(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 PetscCall(PetscRandomSetInterval(rnd, 0.0, 1.0)); 32 PetscCall(PetscRandomSetFromOptions(rnd)); 33 34 PetscCall(PetscMalloc1(n, &values)); 35 for (i = 0; i < n; i++) { 36 PetscCall(PetscRandomGetValue(rnd, &value)); 37 avg += value; 38 if (view_rank == (PetscInt)rank) PetscCall(PetscPrintf(PETSC_COMM_SELF, "[%d] value[%" PetscInt_FMT "] = %6.4e\n", rank, i, (double)PetscRealPart(value))); 39 values[i] = (PetscInt)(n * PetscRealPart(value) + 2.0); 40 } 41 avg = avg / ((PetscReal)n); 42 if (view_rank == (PetscInt)rank) PetscCall(PetscPrintf(PETSC_COMM_SELF, "[%d] Average value %6.4e\n", rank, (double)PetscRealPart(avg))); 43 44 PetscCall(PetscSortInt(n, values)); 45 46 PetscCall(PetscLogEventRegister("Sort", 0, &event)); 47 PetscCall(PetscLogEventBegin(event, 0, 0, 0, 0)); 48 49 PetscCall(PetscRandomSeed(rnd)); 50 for (i = 0; i < n; i++) { 51 PetscCall(PetscRandomGetValue(rnd, &value)); 52 values[i] = (PetscInt)(n * PetscRealPart(value) + 2.0); 53 /* printf("value[%d] = %g\n",i,value); */ 54 } 55 PetscCall(PetscSortInt(n, values)); 56 PetscCall(PetscLogEventEnd(event, 0, 0, 0, 0)); 57 58 for (i = 1; i < n; i++) PetscCheck(values[i] >= values[i - 1], PETSC_COMM_SELF, PETSC_ERR_PLIB, "Values not sorted"); 59 PetscCall(PetscFree(values)); 60 PetscCall(PetscRandomDestroy(&rnd)); 61 62 PetscCall(PetscFinalize()); 63 return 0; 64 } 65 66 /*TEST 67 68 test: 69 70 test: 71 suffix: 2 72 nsize: 2 73 output_file: output/ex1_1.out 74 75 test: 76 suffix: 3 77 args: -view_randomvalues 0 78 79 TEST*/ 80