1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests PetscRandom functions.\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown #include <petscsys.h> 5c4762a1bSJed Brown 6c4762a1bSJed Brown /* Usage: 7c4762a1bSJed Brown mpiexec -n <np> ./ex1 -n <num_of_random_numbers> -random_type <type> -log_view 8c4762a1bSJed Brown -view_randomvalues <view_rank> 9c4762a1bSJed Brown -random_view ascii -random_view :filename 10c4762a1bSJed Brown */ 11c4762a1bSJed Brown 129371c9d4SSatish Balay int main(int argc, char **argv) { 13c4762a1bSJed Brown PetscInt i, n = 1000, *values; 14c4762a1bSJed Brown PetscRandom rnd; 15c4762a1bSJed Brown PetscScalar value, avg = 0.0; 16c4762a1bSJed Brown PetscMPIInt rank; 17c4762a1bSJed Brown PetscInt view_rank = -1; 18c4762a1bSJed Brown #if defined(PETSC_USE_LOG) 19c4762a1bSJed Brown PetscLogEvent event; 20c4762a1bSJed Brown #endif 21c4762a1bSJed Brown 22327415f7SBarry Smith PetscFunctionBeginUser; 239566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &argv, (char *)0, help)); 249566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 259566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL)); 269566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-view_randomvalues", &view_rank, NULL)); 27c4762a1bSJed Brown 289566063dSJacob Faibussowitsch PetscCall(PetscRandomCreate(PETSC_COMM_WORLD, &rnd)); 29c4762a1bSJed Brown /* force imaginary part of random number to always be zero; thus obtain reproducible results with real and complex numbers */ 309566063dSJacob Faibussowitsch PetscCall(PetscRandomSetInterval(rnd, 0.0, 1.0)); 319566063dSJacob Faibussowitsch PetscCall(PetscRandomSetFromOptions(rnd)); 32c4762a1bSJed Brown 339566063dSJacob Faibussowitsch PetscCall(PetscMalloc1(n, &values)); 34c4762a1bSJed Brown for (i = 0; i < n; i++) { 359566063dSJacob Faibussowitsch PetscCall(PetscRandomGetValue(rnd, &value)); 36c4762a1bSJed Brown avg += value; 37*48a46eb9SPierre Jolivet if (view_rank == (PetscInt)rank) PetscCall(PetscPrintf(PETSC_COMM_SELF, "[%d] value[%" PetscInt_FMT "] = %6.4e\n", rank, i, (double)PetscRealPart(value))); 38c4762a1bSJed Brown values[i] = (PetscInt)(n * PetscRealPart(value) + 2.0); 39c4762a1bSJed Brown } 40c4762a1bSJed Brown avg = avg / ((PetscReal)n); 41*48a46eb9SPierre Jolivet if (view_rank == (PetscInt)rank) PetscCall(PetscPrintf(PETSC_COMM_SELF, "[%d] Average value %6.4e\n", rank, (double)PetscRealPart(avg))); 42c4762a1bSJed Brown 439566063dSJacob Faibussowitsch PetscCall(PetscSortInt(n, values)); 44c4762a1bSJed Brown 459566063dSJacob Faibussowitsch PetscCall(PetscLogEventRegister("Sort", 0, &event)); 469566063dSJacob Faibussowitsch PetscCall(PetscLogEventBegin(event, 0, 0, 0, 0)); 47c4762a1bSJed Brown 489566063dSJacob Faibussowitsch PetscCall(PetscRandomSeed(rnd)); 49c4762a1bSJed Brown for (i = 0; i < n; i++) { 509566063dSJacob Faibussowitsch PetscCall(PetscRandomGetValue(rnd, &value)); 51c4762a1bSJed Brown values[i] = (PetscInt)(n * PetscRealPart(value) + 2.0); 52c4762a1bSJed Brown /* printf("value[%d] = %g\n",i,value); */ 53c4762a1bSJed Brown } 549566063dSJacob Faibussowitsch PetscCall(PetscSortInt(n, values)); 559566063dSJacob Faibussowitsch PetscCall(PetscLogEventEnd(event, 0, 0, 0, 0)); 56c4762a1bSJed Brown 579371c9d4SSatish Balay for (i = 1; i < n; i++) { PetscCheck(values[i] >= values[i - 1], PETSC_COMM_SELF, PETSC_ERR_PLIB, "Values not sorted"); } 589566063dSJacob Faibussowitsch PetscCall(PetscFree(values)); 599566063dSJacob Faibussowitsch PetscCall(PetscRandomDestroy(&rnd)); 60c4762a1bSJed Brown 619566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 62b122ec5aSJacob Faibussowitsch return 0; 63c4762a1bSJed Brown } 64c4762a1bSJed Brown 65c4762a1bSJed Brown /*TEST 66c4762a1bSJed Brown 67c4762a1bSJed Brown test: 68c4762a1bSJed Brown 69c4762a1bSJed Brown test: 70c4762a1bSJed Brown suffix: 2 71c4762a1bSJed Brown nsize: 2 72c4762a1bSJed Brown output_file: output/ex1_1.out 73c4762a1bSJed Brown 74c4762a1bSJed Brown test: 75c4762a1bSJed Brown suffix: 3 76c4762a1bSJed Brown args: -view_randomvalues 0 77c4762a1bSJed Brown 78c4762a1bSJed Brown TEST*/ 79