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 PetscErrorCode ierr; 8c4762a1bSJed Brown PetscMPIInt rank,size; 9c4762a1bSJed Brown PetscInt N0=4096,N1=4096,N2=256,N3=10,N4=10,N=N0*N1; 10c4762a1bSJed Brown PetscRandom rdm; 11c4762a1bSJed Brown PetscReal enorm; 12c4762a1bSJed Brown Vec x,y,z,input,output; 13c4762a1bSJed Brown Mat A; 14c4762a1bSJed Brown PetscInt DIM, dim[5],vsize,row,col; 15c4762a1bSJed Brown PetscReal fac; 16c4762a1bSJed Brown 17c4762a1bSJed Brown ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 18*5f80ce2aSJacob Faibussowitsch CHKERRMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 19*5f80ce2aSJacob Faibussowitsch CHKERRMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 20c4762a1bSJed Brown 21c4762a1bSJed Brown #if defined(PETSC_USE_COMPLEX) 22c4762a1bSJed Brown SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP, "Example for Real DFT. Your current data type is complex!"); 23c4762a1bSJed Brown #endif 24*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRandomCreate(PETSC_COMM_WORLD, &rdm)); 25*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRandomSetFromOptions(rdm)); 26*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecCreate(PETSC_COMM_WORLD,&input)); 27*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecSetSizes(input,PETSC_DECIDE,N)); 28*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecSetFromOptions(input)); 29*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecSetRandom(input,rdm)); 30*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDuplicate(input,&output)); 31c4762a1bSJed Brown 32c4762a1bSJed Brown DIM = 2; dim[0] = N0; dim[1] = N1; dim[2] = N2; dim[3] = N3; dim[4] = N4; 33*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreateFFT(PETSC_COMM_WORLD,DIM,dim,MATFFTW,&A)); 34*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatGetLocalSize(A,&row,&col)); 35c4762a1bSJed Brown printf("The Matrix size is %d and %d from process %d\n",row,col,rank); 36*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreateVecsFFTW(A,&x,&y,&z)); 37c4762a1bSJed Brown 38*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecGetSize(x,&vsize)); 39c4762a1bSJed Brown 40*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecGetSize(z,&vsize)); 41c4762a1bSJed Brown printf("The vector size of output from the main routine is %d\n",vsize); 42c4762a1bSJed Brown 43*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecScatterPetscToFFTW(A,input,x)); 44*5f80ce2aSJacob Faibussowitsch /*CHKERRQ(VecDestroy(&input));*/ 45*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatMult(A,x,y)); 46*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatMultTranspose(A,y,z)); 47*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecScatterFFTWToPetsc(A,z,output)); 48*5f80ce2aSJacob Faibussowitsch /*CHKERRQ(VecDestroy(&z));*/ 49c4762a1bSJed Brown fac = 1.0/(PetscReal)N; 50*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecScale(output,fac)); 51c4762a1bSJed Brown 52*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyBegin(input)); 53*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyEnd(input)); 54*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyBegin(output)); 55*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyEnd(output)); 56c4762a1bSJed Brown 57*5f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecView(input,PETSC_VIEWER_STDOUT_WORLD));*/ 58*5f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecView(output,PETSC_VIEWER_STDOUT_WORLD));*/ 59c4762a1bSJed Brown 60*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAXPY(output,-1.0,input)); 61*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecNorm(output,NORM_1,&enorm)); 62c4762a1bSJed Brown if (enorm > 1.e-14) { 63*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscPrintf(PETSC_COMM_SELF," Error norm of |x - z| %e\n",enorm)); 64c4762a1bSJed Brown } 65c4762a1bSJed Brown 66*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&x)); 67*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&y)); 68*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&z)); 69*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&output)); 70*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&input)); 71*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatDestroy(&A)); 72*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRandomDestroy(&rdm)); 73c4762a1bSJed Brown ierr = PetscFinalize(); 74c4762a1bSJed Brown return ierr; 75c4762a1bSJed Brown 76c4762a1bSJed Brown } 77