1c4762a1bSJed Brown static char help[]="This program illustrates the use of PETSc-fftw interface for parallel real DFT\n"; 2c4762a1bSJed Brown #include <petscmat.h> 3c4762a1bSJed Brown #include <fftw3-mpi.h> 4c4762a1bSJed Brown /*extern PetscErrorCode MatCreateVecsFFT(Mat,Vec *,Vec *,Vec *);*/ 5ad0e0ea3SStefano Zampini int main(int argc,char **args) 6c4762a1bSJed Brown { 7c4762a1bSJed Brown PetscMPIInt rank,size; 8c4762a1bSJed Brown PetscInt N0=4096,N1=4096,N2=256,N3=10,N4=10,N=N0*N1; 9c4762a1bSJed Brown PetscRandom rdm; 10c4762a1bSJed Brown PetscReal enorm; 11c4762a1bSJed Brown Vec x,y,z,input,output; 12c4762a1bSJed Brown Mat A; 13c4762a1bSJed Brown PetscInt DIM, dim[5],vsize,row,col; 14c4762a1bSJed Brown PetscReal fac; 15c4762a1bSJed Brown 16*9566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 17*9566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 18*9566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 19c4762a1bSJed Brown 20c4762a1bSJed Brown #if defined(PETSC_USE_COMPLEX) 21c4762a1bSJed Brown SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP, "Example for Real DFT. Your current data type is complex!"); 22c4762a1bSJed Brown #endif 23*9566063dSJacob Faibussowitsch PetscCall(PetscRandomCreate(PETSC_COMM_WORLD, &rdm)); 24*9566063dSJacob Faibussowitsch PetscCall(PetscRandomSetFromOptions(rdm)); 25*9566063dSJacob Faibussowitsch PetscCall(VecCreate(PETSC_COMM_WORLD,&input)); 26*9566063dSJacob Faibussowitsch PetscCall(VecSetSizes(input,PETSC_DECIDE,N)); 27*9566063dSJacob Faibussowitsch PetscCall(VecSetFromOptions(input)); 28*9566063dSJacob Faibussowitsch PetscCall(VecSetRandom(input,rdm)); 29*9566063dSJacob Faibussowitsch PetscCall(VecDuplicate(input,&output)); 30c4762a1bSJed Brown 31c4762a1bSJed Brown DIM = 2; dim[0] = N0; dim[1] = N1; dim[2] = N2; dim[3] = N3; dim[4] = N4; 32*9566063dSJacob Faibussowitsch PetscCall(MatCreateFFT(PETSC_COMM_WORLD,DIM,dim,MATFFTW,&A)); 33*9566063dSJacob Faibussowitsch PetscCall(MatGetLocalSize(A,&row,&col)); 34c4762a1bSJed Brown printf("The Matrix size is %d and %d from process %d\n",row,col,rank); 35*9566063dSJacob Faibussowitsch PetscCall(MatCreateVecsFFTW(A,&x,&y,&z)); 36c4762a1bSJed Brown 37*9566063dSJacob Faibussowitsch PetscCall(VecGetSize(x,&vsize)); 38c4762a1bSJed Brown 39*9566063dSJacob Faibussowitsch PetscCall(VecGetSize(z,&vsize)); 40c4762a1bSJed Brown printf("The vector size of output from the main routine is %d\n",vsize); 41c4762a1bSJed Brown 42*9566063dSJacob Faibussowitsch PetscCall(VecScatterPetscToFFTW(A,input,x)); 43*9566063dSJacob Faibussowitsch /*PetscCall(VecDestroy(&input));*/ 44*9566063dSJacob Faibussowitsch PetscCall(MatMult(A,x,y)); 45*9566063dSJacob Faibussowitsch PetscCall(MatMultTranspose(A,y,z)); 46*9566063dSJacob Faibussowitsch PetscCall(VecScatterFFTWToPetsc(A,z,output)); 47*9566063dSJacob Faibussowitsch /*PetscCall(VecDestroy(&z));*/ 48c4762a1bSJed Brown fac = 1.0/(PetscReal)N; 49*9566063dSJacob Faibussowitsch PetscCall(VecScale(output,fac)); 50c4762a1bSJed Brown 51*9566063dSJacob Faibussowitsch PetscCall(VecAssemblyBegin(input)); 52*9566063dSJacob Faibussowitsch PetscCall(VecAssemblyEnd(input)); 53*9566063dSJacob Faibussowitsch PetscCall(VecAssemblyBegin(output)); 54*9566063dSJacob Faibussowitsch PetscCall(VecAssemblyEnd(output)); 55c4762a1bSJed Brown 56*9566063dSJacob Faibussowitsch /* PetscCall(VecView(input,PETSC_VIEWER_STDOUT_WORLD));*/ 57*9566063dSJacob Faibussowitsch /* PetscCall(VecView(output,PETSC_VIEWER_STDOUT_WORLD));*/ 58c4762a1bSJed Brown 59*9566063dSJacob Faibussowitsch PetscCall(VecAXPY(output,-1.0,input)); 60*9566063dSJacob Faibussowitsch PetscCall(VecNorm(output,NORM_1,&enorm)); 61c4762a1bSJed Brown if (enorm > 1.e-14) { 62*9566063dSJacob Faibussowitsch PetscCall(PetscPrintf(PETSC_COMM_SELF," Error norm of |x - z| %e\n",enorm)); 63c4762a1bSJed Brown } 64c4762a1bSJed Brown 65*9566063dSJacob Faibussowitsch PetscCall(VecDestroy(&x)); 66*9566063dSJacob Faibussowitsch PetscCall(VecDestroy(&y)); 67*9566063dSJacob Faibussowitsch PetscCall(VecDestroy(&z)); 68*9566063dSJacob Faibussowitsch PetscCall(VecDestroy(&output)); 69*9566063dSJacob Faibussowitsch PetscCall(VecDestroy(&input)); 70*9566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 71*9566063dSJacob Faibussowitsch PetscCall(PetscRandomDestroy(&rdm)); 72*9566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 73b122ec5aSJacob Faibussowitsch return 0; 74c4762a1bSJed Brown 75c4762a1bSJed Brown } 76