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> 4ad0e0ea3SStefano Zampini int main(int argc,char **args) 5c4762a1bSJed Brown { 6c4762a1bSJed Brown PetscMPIInt rank,size; 7c4762a1bSJed Brown PetscInt N0=2048,N1=2048,N2=3,N3=5,N4=5,N=N0*N1; 8c4762a1bSJed Brown PetscRandom rdm; 9c4762a1bSJed Brown PetscReal enorm; 10c4762a1bSJed Brown Vec x,y,z,input,output; 11c4762a1bSJed Brown Mat A; 12c4762a1bSJed Brown PetscInt DIM, dim[5],vsize; 13c4762a1bSJed Brown PetscReal fac; 14c4762a1bSJed Brown PetscScalar one=1,two=2,three=3; 15c4762a1bSJed Brown 16*b122ec5aSJacob Faibussowitsch CHKERRQ(PetscInitialize(&argc,&args,(char*)0,help)); 17c4762a1bSJed Brown #if defined(PETSC_USE_COMPLEX) 18c4762a1bSJed Brown SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP, "This example requires real numbers"); 19c4762a1bSJed Brown #endif 205f80ce2aSJacob Faibussowitsch CHKERRMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 215f80ce2aSJacob Faibussowitsch CHKERRMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 22c4762a1bSJed Brown 235f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRandomCreate(PETSC_COMM_WORLD, &rdm)); 245f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRandomSetFromOptions(rdm)); 255f80ce2aSJacob Faibussowitsch CHKERRQ(VecCreate(PETSC_COMM_WORLD,&input)); 265f80ce2aSJacob Faibussowitsch CHKERRQ(VecSetSizes(input,PETSC_DECIDE,N)); 275f80ce2aSJacob Faibussowitsch CHKERRQ(VecSetFromOptions(input)); 285f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecSet(input,one)); */ 295f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecSetValue(input,1,two,INSERT_VALUES)); */ 305f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecSetValue(input,2,three,INSERT_VALUES)); */ 315f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecSetValue(input,3,three,INSERT_VALUES)); */ 325f80ce2aSJacob Faibussowitsch CHKERRQ(VecSetRandom(input,rdm)); 335f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecSetRandom(input,rdm)); */ 345f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecSetRandom(input,rdm)); */ 355f80ce2aSJacob Faibussowitsch CHKERRQ(VecDuplicate(input,&output)); 36c4762a1bSJed Brown 37c4762a1bSJed Brown DIM = 2; dim[0] = N0; dim[1] = N1; dim[2] = N2; dim[3] = N3; dim[4] = N4; 385f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreateFFT(PETSC_COMM_WORLD,DIM,dim,MATFFTW,&A)); 395f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreateVecsFFTW(A,&x,&y,&z)); 405f80ce2aSJacob Faibussowitsch /* CHKERRQ(MatCreateVecs(A,&x,&y)); */ 415f80ce2aSJacob Faibussowitsch /* CHKERRQ(MatCreateVecs(A,&z,NULL)); */ 42c4762a1bSJed Brown 435f80ce2aSJacob Faibussowitsch CHKERRQ(VecGetSize(x,&vsize)); 44c4762a1bSJed Brown printf("The vector size of input from the main routine is %d\n",vsize); 45c4762a1bSJed Brown 465f80ce2aSJacob Faibussowitsch CHKERRQ(VecGetSize(z,&vsize)); 47c4762a1bSJed Brown printf("The vector size of output from the main routine is %d\n",vsize); 48c4762a1bSJed Brown 495f80ce2aSJacob Faibussowitsch CHKERRQ(InputTransformFFT(A,input,x)); 50c4762a1bSJed Brown 515f80ce2aSJacob Faibussowitsch CHKERRQ(MatMult(A,x,y)); 525f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyBegin(y)); 535f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyEnd(y)); 545f80ce2aSJacob Faibussowitsch CHKERRQ(VecView(y,PETSC_VIEWER_STDOUT_WORLD)); 55c4762a1bSJed Brown 565f80ce2aSJacob Faibussowitsch CHKERRQ(MatMultTranspose(A,y,z)); 57c4762a1bSJed Brown 585f80ce2aSJacob Faibussowitsch CHKERRQ(OutputTransformFFT(A,z,output)); 59c4762a1bSJed Brown fac = 1.0/(PetscReal)N; 605f80ce2aSJacob Faibussowitsch CHKERRQ(VecScale(output,fac)); 61c4762a1bSJed Brown 625f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyBegin(input)); 635f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyEnd(input)); 645f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyBegin(output)); 655f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyEnd(output)); 66c4762a1bSJed Brown 675f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecView(input,PETSC_VIEWER_STDOUT_WORLD)); */ 685f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecView(output,PETSC_VIEWER_STDOUT_WORLD)); */ 69c4762a1bSJed Brown 705f80ce2aSJacob Faibussowitsch CHKERRQ(VecAXPY(output,-1.0,input)); 715f80ce2aSJacob Faibussowitsch CHKERRQ(VecNorm(output,NORM_1,&enorm)); 72c4762a1bSJed Brown /* if (enorm > 1.e-14) { */ 735f80ce2aSJacob Faibussowitsch CHKERRQ(PetscPrintf(PETSC_COMM_SELF," Error norm of |x - z| %e\n",enorm)); 74c4762a1bSJed Brown /* } */ 75c4762a1bSJed Brown 765f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&output)); 775f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&input)); 785f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&x)); 795f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&y)); 805f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&z)); 815f80ce2aSJacob Faibussowitsch CHKERRQ(MatDestroy(&A)); 825f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRandomDestroy(&rdm)); 83*b122ec5aSJacob Faibussowitsch CHKERRQ(PetscFinalize()); 84*b122ec5aSJacob Faibussowitsch return 0; 85c4762a1bSJed Brown 86c4762a1bSJed Brown } 87