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 12c4762a1bSJed Brown int main(int argc,char **argv) 13c4762a1bSJed Brown { 14c4762a1bSJed Brown PetscInt i,n = 1000,*values; 15c4762a1bSJed Brown PetscRandom rnd; 16c4762a1bSJed Brown PetscScalar value,avg = 0.0; 17c4762a1bSJed Brown PetscErrorCode ierr; 18c4762a1bSJed Brown PetscMPIInt rank; 19c4762a1bSJed Brown PetscInt view_rank=-1; 20c4762a1bSJed Brown #if defined(PETSC_USE_LOG) 21c4762a1bSJed Brown PetscLogEvent event; 22c4762a1bSJed Brown #endif 23c4762a1bSJed Brown 24c4762a1bSJed Brown ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 25ffc4695bSBarry Smith ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRMPI(ierr); 26c4762a1bSJed Brown ierr = PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);CHKERRQ(ierr); 27c4762a1bSJed Brown ierr = PetscOptionsGetInt(NULL,NULL,"-view_randomvalues",&view_rank,NULL);CHKERRQ(ierr); 28c4762a1bSJed Brown 29c4762a1bSJed Brown ierr = PetscRandomCreate(PETSC_COMM_WORLD,&rnd);CHKERRQ(ierr); 30c4762a1bSJed Brown /* force imaginary part of random number to always be zero; thus obtain reproducible results with real and complex numbers */ 31c4762a1bSJed Brown ierr = PetscRandomSetInterval(rnd,0.0,1.0);CHKERRQ(ierr); 32c4762a1bSJed Brown ierr = PetscRandomSetFromOptions(rnd);CHKERRQ(ierr); 33c4762a1bSJed Brown 34c4762a1bSJed Brown ierr = PetscMalloc1(n,&values);CHKERRQ(ierr); 35c4762a1bSJed Brown for (i=0; i<n; i++) { 36c4762a1bSJed Brown ierr = PetscRandomGetValue(rnd,&value);CHKERRQ(ierr); 37c4762a1bSJed Brown avg += value; 38c4762a1bSJed Brown if (view_rank == (PetscInt)rank) { 39*3ca90d2dSJacob Faibussowitsch ierr = PetscPrintf(PETSC_COMM_SELF,"[%d] value[%" PetscInt_FMT "] = %6.4e\n",rank,i,(double)PetscRealPart(value));CHKERRQ(ierr); 40c4762a1bSJed Brown } 41c4762a1bSJed Brown values[i] = (PetscInt)(n*PetscRealPart(value) + 2.0); 42c4762a1bSJed Brown } 43c4762a1bSJed Brown avg = avg/((PetscReal)n); 44c4762a1bSJed Brown if (view_rank == (PetscInt)rank) { 45c4762a1bSJed Brown ierr = PetscPrintf(PETSC_COMM_SELF,"[%d] Average value %6.4e\n",rank,(double)PetscRealPart(avg));CHKERRQ(ierr); 46c4762a1bSJed Brown } 47c4762a1bSJed Brown 48c4762a1bSJed Brown ierr = PetscSortInt(n,values);CHKERRQ(ierr); 49c4762a1bSJed Brown 50c4762a1bSJed Brown ierr = PetscLogEventRegister("Sort",0,&event);CHKERRQ(ierr); 51c4762a1bSJed Brown ierr = PetscLogEventBegin(event,0,0,0,0);CHKERRQ(ierr); 52c4762a1bSJed Brown 53c4762a1bSJed Brown ierr = PetscRandomSeed(rnd);CHKERRQ(ierr); 54c4762a1bSJed Brown for (i=0; i<n; i++) { 55c4762a1bSJed Brown ierr = PetscRandomGetValue(rnd,&value);CHKERRQ(ierr); 56c4762a1bSJed Brown values[i] = (PetscInt)(n*PetscRealPart(value) + 2.0); 57c4762a1bSJed Brown /* printf("value[%d] = %g\n",i,value); */ 58c4762a1bSJed Brown } 59c4762a1bSJed Brown ierr = PetscSortInt(n,values);CHKERRQ(ierr); 60c4762a1bSJed Brown ierr = PetscLogEventEnd(event,0,0,0,0);CHKERRQ(ierr); 61c4762a1bSJed Brown 62c4762a1bSJed Brown for (i=1; i<n; i++) { 63c4762a1bSJed Brown if (values[i] < values[i-1]) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_PLIB,"Values not sorted"); 64c4762a1bSJed Brown } 65c4762a1bSJed Brown ierr = PetscFree(values);CHKERRQ(ierr); 66c4762a1bSJed Brown ierr = PetscRandomDestroy(&rnd);CHKERRQ(ierr); 67c4762a1bSJed Brown 68c4762a1bSJed Brown ierr = PetscFinalize(); 69c4762a1bSJed Brown return ierr; 70c4762a1bSJed Brown } 71c4762a1bSJed Brown 72c4762a1bSJed Brown /*TEST 73c4762a1bSJed Brown 74c4762a1bSJed Brown test: 75c4762a1bSJed Brown 76c4762a1bSJed Brown test: 77c4762a1bSJed Brown suffix: 2 78c4762a1bSJed Brown nsize: 2 79c4762a1bSJed Brown output_file: output/ex1_1.out 80c4762a1bSJed Brown 81c4762a1bSJed Brown test: 82c4762a1bSJed Brown suffix: 3 83c4762a1bSJed Brown args: -view_randomvalues 0 84c4762a1bSJed Brown 85c4762a1bSJed Brown TEST*/ 86