1c4762a1bSJed Brown static char help[] = "Tests PetscRandom functions.\n\n"; 2c4762a1bSJed Brown 3c4762a1bSJed Brown #include <petscsys.h> 4c4762a1bSJed Brown 5c4762a1bSJed Brown /* Usage: 6c4762a1bSJed Brown mpiexec -n <np> ./ex1 -n <num_of_random_numbers> -random_type <type> -log_view 7c4762a1bSJed Brown -view_randomvalues <view_rank> 8c4762a1bSJed Brown -random_view ascii -random_view :filename 9c4762a1bSJed Brown */ 10c4762a1bSJed Brown 11d71ae5a4SJacob Faibussowitsch int main(int argc, char **argv) 12d71ae5a4SJacob Faibussowitsch { 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 PetscLogEvent event; 19c4762a1bSJed Brown 20327415f7SBarry Smith PetscFunctionBeginUser; 21c8025a54SPierre Jolivet PetscCall(PetscInitialize(&argc, &argv, NULL, help)); 229566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 239566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL)); 249566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-view_randomvalues", &view_rank, NULL)); 25c4762a1bSJed Brown 269566063dSJacob Faibussowitsch PetscCall(PetscRandomCreate(PETSC_COMM_WORLD, &rnd)); 27c4762a1bSJed Brown /* force imaginary part of random number to always be zero; thus obtain reproducible results with real and complex numbers */ 289566063dSJacob Faibussowitsch PetscCall(PetscRandomSetInterval(rnd, 0.0, 1.0)); 299566063dSJacob Faibussowitsch PetscCall(PetscRandomSetFromOptions(rnd)); 30c4762a1bSJed Brown 319566063dSJacob Faibussowitsch PetscCall(PetscMalloc1(n, &values)); 32c4762a1bSJed Brown for (i = 0; i < n; i++) { 339566063dSJacob Faibussowitsch PetscCall(PetscRandomGetValue(rnd, &value)); 34c4762a1bSJed Brown avg += value; 35300f1712SStefano Zampini if (view_rank == rank) PetscCall(PetscPrintf(PETSC_COMM_SELF, "[%d] value[%" PetscInt_FMT "] = %6.4e\n", rank, i, (double)PetscRealPart(value))); 36c4762a1bSJed Brown values[i] = (PetscInt)(n * PetscRealPart(value) + 2.0); 37c4762a1bSJed Brown } 38c4762a1bSJed Brown avg = avg / ((PetscReal)n); 39300f1712SStefano Zampini if (view_rank == rank) PetscCall(PetscPrintf(PETSC_COMM_SELF, "[%d] Average value %6.4e\n", rank, (double)PetscRealPart(avg))); 40c4762a1bSJed Brown 419566063dSJacob Faibussowitsch PetscCall(PetscSortInt(n, values)); 42c4762a1bSJed Brown 439566063dSJacob Faibussowitsch PetscCall(PetscLogEventRegister("Sort", 0, &event)); 449566063dSJacob Faibussowitsch PetscCall(PetscLogEventBegin(event, 0, 0, 0, 0)); 45c4762a1bSJed Brown 469566063dSJacob Faibussowitsch PetscCall(PetscRandomSeed(rnd)); 47c4762a1bSJed Brown for (i = 0; i < n; i++) { 489566063dSJacob Faibussowitsch PetscCall(PetscRandomGetValue(rnd, &value)); 49c4762a1bSJed Brown values[i] = (PetscInt)(n * PetscRealPart(value) + 2.0); 50c4762a1bSJed Brown /* printf("value[%d] = %g\n",i,value); */ 51c4762a1bSJed Brown } 529566063dSJacob Faibussowitsch PetscCall(PetscSortInt(n, values)); 539566063dSJacob Faibussowitsch PetscCall(PetscLogEventEnd(event, 0, 0, 0, 0)); 54c4762a1bSJed Brown 55ad540459SPierre Jolivet for (i = 1; i < n; i++) PetscCheck(values[i] >= values[i - 1], PETSC_COMM_SELF, PETSC_ERR_PLIB, "Values not sorted"); 569566063dSJacob Faibussowitsch PetscCall(PetscFree(values)); 579566063dSJacob Faibussowitsch PetscCall(PetscRandomDestroy(&rnd)); 58c4762a1bSJed Brown 599566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 60b122ec5aSJacob Faibussowitsch return 0; 61c4762a1bSJed Brown } 62c4762a1bSJed Brown 63c4762a1bSJed Brown /*TEST 64c4762a1bSJed Brown 65c4762a1bSJed Brown test: 66*3886731fSPierre Jolivet output_file: output/empty.out 67c4762a1bSJed Brown 68c4762a1bSJed Brown test: 69c4762a1bSJed Brown suffix: 2 70c4762a1bSJed Brown nsize: 2 71*3886731fSPierre Jolivet output_file: output/empty.out 72c4762a1bSJed Brown 73c4762a1bSJed Brown test: 74c4762a1bSJed Brown suffix: 3 75c4762a1bSJed Brown args: -view_randomvalues 0 76c4762a1bSJed Brown 77c4762a1bSJed Brown TEST*/ 78