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 PetscMPIInt rank; 18c4762a1bSJed Brown PetscInt view_rank=-1; 19c4762a1bSJed Brown #if defined(PETSC_USE_LOG) 20c4762a1bSJed Brown PetscLogEvent event; 21c4762a1bSJed Brown #endif 22c4762a1bSJed Brown 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; 37c4762a1bSJed Brown if (view_rank == (PetscInt)rank) { 389566063dSJacob Faibussowitsch PetscCall(PetscPrintf(PETSC_COMM_SELF,"[%d] value[%" PetscInt_FMT "] = %6.4e\n",rank,i,(double)PetscRealPart(value))); 39c4762a1bSJed Brown } 40c4762a1bSJed Brown values[i] = (PetscInt)(n*PetscRealPart(value) + 2.0); 41c4762a1bSJed Brown } 42c4762a1bSJed Brown avg = avg/((PetscReal)n); 43c4762a1bSJed Brown if (view_rank == (PetscInt)rank) { 449566063dSJacob Faibussowitsch PetscCall(PetscPrintf(PETSC_COMM_SELF,"[%d] Average value %6.4e\n",rank,(double)PetscRealPart(avg))); 45c4762a1bSJed Brown } 46c4762a1bSJed Brown 479566063dSJacob Faibussowitsch PetscCall(PetscSortInt(n,values)); 48c4762a1bSJed Brown 499566063dSJacob Faibussowitsch PetscCall(PetscLogEventRegister("Sort",0,&event)); 509566063dSJacob Faibussowitsch PetscCall(PetscLogEventBegin(event,0,0,0,0)); 51c4762a1bSJed Brown 529566063dSJacob Faibussowitsch PetscCall(PetscRandomSeed(rnd)); 53c4762a1bSJed Brown for (i=0; i<n; i++) { 549566063dSJacob Faibussowitsch PetscCall(PetscRandomGetValue(rnd,&value)); 55c4762a1bSJed Brown values[i] = (PetscInt)(n*PetscRealPart(value) + 2.0); 56c4762a1bSJed Brown /* printf("value[%d] = %g\n",i,value); */ 57c4762a1bSJed Brown } 589566063dSJacob Faibussowitsch PetscCall(PetscSortInt(n,values)); 599566063dSJacob Faibussowitsch PetscCall(PetscLogEventEnd(event,0,0,0,0)); 60c4762a1bSJed Brown 61c4762a1bSJed Brown for (i=1; i<n; i++) { 62*08401ef6SPierre Jolivet PetscCheck(values[i] >= values[i-1],PETSC_COMM_SELF,PETSC_ERR_PLIB,"Values not sorted"); 63c4762a1bSJed Brown } 649566063dSJacob Faibussowitsch PetscCall(PetscFree(values)); 659566063dSJacob Faibussowitsch PetscCall(PetscRandomDestroy(&rnd)); 66c4762a1bSJed Brown 679566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 68b122ec5aSJacob Faibussowitsch return 0; 69c4762a1bSJed Brown } 70c4762a1bSJed Brown 71c4762a1bSJed Brown /*TEST 72c4762a1bSJed Brown 73c4762a1bSJed Brown test: 74c4762a1bSJed Brown 75c4762a1bSJed Brown test: 76c4762a1bSJed Brown suffix: 2 77c4762a1bSJed Brown nsize: 2 78c4762a1bSJed Brown output_file: output/ex1_1.out 79c4762a1bSJed Brown 80c4762a1bSJed Brown test: 81c4762a1bSJed Brown suffix: 3 82c4762a1bSJed Brown args: -view_randomvalues 0 83c4762a1bSJed Brown 84c4762a1bSJed Brown TEST*/ 85