Actual source code: cufft.cu
petsc-3.9.4 2018-09-11
2: /*
3: Provides an interface to the CUFFT package.
4: Testing examples can be found in ~src/mat/examples/tests
5: */
7: #include <petsc/private/matimpl.h>
8: EXTERN_C_BEGIN
9: #include <cuda.h>
10: #include <cuda_runtime.h>
11: #include <cufft.h>
12: EXTERN_C_END
14: typedef struct {
15: PetscInt ndim;
16: PetscInt *dim;
17: cufftHandle p_forward, p_backward;
18: cufftComplex *devArray;
19: } Mat_CUFFT;
21: PetscErrorCode MatMult_SeqCUFFT(Mat A, Vec x, Vec y)
22: {
23: Mat_CUFFT *cufft = (Mat_CUFFT*) A->data;
24: cufftComplex *devArray = cufft->devArray;
25: PetscInt ndim = cufft->ndim, *dim = cufft->dim;
26: PetscScalar *x_array, *y_array;
27: cufftResult result;
31: VecGetArray(x, &x_array);
32: VecGetArray(y, &y_array);
33: if (!cufft->p_forward) {
34: cufftResult result;
35: /* create a plan, then execute it */
36: switch (ndim) {
37: case 1:
38: result = cufftPlan1d(&cufft->p_forward, dim[0], CUFFT_C2C, 1);CHKERRQ(result != CUFFT_SUCCESS);
39: break;
40: case 2:
41: result = cufftPlan2d(&cufft->p_forward, dim[0], dim[1], CUFFT_C2C);CHKERRQ(result != CUFFT_SUCCESS);
42: break;
43: case 3:
44: result = cufftPlan3d(&cufft->p_forward, dim[0], dim[1], dim[2], CUFFT_C2C);CHKERRQ(result != CUFFT_SUCCESS);
45: break;
46: default:
47: SETERRQ1(PETSC_COMM_SELF, PETSC_ERR_USER, "Cannot create plan for %d-dimensional transform", ndim);
48: }
49: }
50: /* transfer to GPU memory */
51: cudaMemcpy(devArray, x_array, sizeof(cufftComplex)*dim[ndim], cudaMemcpyHostToDevice);
52: /* execute transform */
53: result = cufftExecC2C(cufft->p_forward, devArray, devArray, CUFFT_FORWARD);CHKERRQ(result != CUFFT_SUCCESS);
54: /* transfer from GPU memory */
55: cudaMemcpy(y_array, devArray, sizeof(cufftComplex)*dim[ndim], cudaMemcpyDeviceToHost);
56: VecRestoreArray(y, &y_array);
57: VecRestoreArray(x, &x_array);
58: return(0);
59: }
61: PetscErrorCode MatMultTranspose_SeqCUFFT(Mat A, Vec x, Vec y)
62: {
63: Mat_CUFFT *cufft = (Mat_CUFFT*) A->data;
64: cufftComplex *devArray = cufft->devArray;
65: PetscInt ndim = cufft->ndim, *dim = cufft->dim;
66: PetscScalar *x_array, *y_array;
67: cufftResult result;
71: VecGetArray(x, &x_array);
72: VecGetArray(y, &y_array);
73: if (!cufft->p_backward) {
74: /* create a plan, then execute it */
75: switch (ndim) {
76: case 1:
77: result = cufftPlan1d(&cufft->p_backward, dim[0], CUFFT_C2C, 1);CHKERRQ(result != CUFFT_SUCCESS);
78: break;
79: case 2:
80: result = cufftPlan2d(&cufft->p_backward, dim[0], dim[1], CUFFT_C2C);CHKERRQ(result != CUFFT_SUCCESS);
81: break;
82: case 3:
83: result = cufftPlan3d(&cufft->p_backward, dim[0], dim[1], dim[2], CUFFT_C2C);CHKERRQ(result != CUFFT_SUCCESS);
84: break;
85: default:
86: SETERRQ1(PETSC_COMM_SELF, PETSC_ERR_USER, "Cannot create plan for %d-dimensional transform", ndim);
87: }
88: }
89: /* transfer to GPU memory */
90: cudaMemcpy(devArray, x_array, sizeof(cufftComplex)*dim[ndim], cudaMemcpyHostToDevice);
91: /* execute transform */
92: result = cufftExecC2C(cufft->p_forward, devArray, devArray, CUFFT_INVERSE);CHKERRQ(result != CUFFT_SUCCESS);
93: /* transfer from GPU memory */
94: cudaMemcpy(y_array, devArray, sizeof(cufftComplex)*dim[ndim], cudaMemcpyDeviceToHost);
95: VecRestoreArray(y, &y_array);
96: VecRestoreArray(x, &x_array);
97: return(0);
98: }
100: PetscErrorCode MatDestroy_SeqCUFFT(Mat A)
101: {
102: Mat_CUFFT *cufft = (Mat_CUFFT*) A->data;
103: cufftResult result;
107: PetscFree(cufft->dim);
108: if (cufft->p_forward) {result = cufftDestroy(cufft->p_forward);CHKERRQ(result != CUFFT_SUCCESS);}
109: if (cufft->p_backward) {result = cufftDestroy(cufft->p_backward);CHKERRQ(result != CUFFT_SUCCESS);}
110: cudaFree(cufft->devArray);
111: PetscFree(A->data);
112: PetscObjectChangeTypeName((PetscObject)A,0);
113: return(0);
114: }
116: /*@
117: MatCreateSeqCUFFT - Creates a matrix object that provides sequential FFT via the external package CUFFT
119: Collective on MPI_Comm
121: Input Parameters:
122: + comm - MPI communicator, set to PETSC_COMM_SELF
123: . ndim - the ndim-dimensional transform
124: - dim - array of size ndim, dim[i] contains the vector length in the i-dimension
126: Output Parameter:
127: . A - the matrix
129: Options Database Keys:
130: . -mat_cufft_plannerflags - set CUFFT planner flags
132: Level: intermediate
133: @*/
134: PetscErrorCode MatCreateSeqCUFFT(MPI_Comm comm, PetscInt ndim, const PetscInt dim[], Mat *A)
135: {
136: Mat_CUFFT *cufft;
137: PetscInt m, d;
141: if (ndim < 0) SETERRQ1(PETSC_COMM_SELF, PETSC_ERR_USER, "ndim %d must be > 0", ndim);
142: MatCreate(comm, A);
143: m = 1;
144: for (d = 0; d < ndim; ++d) {
145: if (dim[d] < 0) SETERRQ2(PETSC_COMM_SELF, PETSC_ERR_USER, "dim[%d]=%d must be > 0", d, dim[d]);
146: m *= dim[d];
147: }
148: MatSetSizes(*A, m, m, m, m);
149: PetscObjectChangeTypeName((PetscObject)*A, MATSEQCUFFT);
151: PetscNewLog(*A,&cufft);
152: (*A)->data = (void*) cufft;
153: PetscMalloc1(ndim+1, &cufft->dim);
154: PetscMemcpy(cufft->dim, dim, ndim*sizeof(PetscInt));
156: cufft->ndim = ndim;
157: cufft->p_forward = 0;
158: cufft->p_backward = 0;
159: cufft->dim[ndim] = m;
161: /* GPU memory allocation */
162: cudaMalloc((void**) &cufft->devArray, sizeof(cufftComplex)*m);
164: (*A)->ops->mult = MatMult_SeqCUFFT;
165: (*A)->ops->multtranspose = MatMultTranspose_SeqCUFFT;
166: (*A)->assembled = PETSC_TRUE;
167: (*A)->ops->destroy = MatDestroy_SeqCUFFT;
169: /* get runtime options */
170: PetscOptionsBegin(comm, ((PetscObject)(*A))->prefix, "CUFFT Options", "Mat");
171: PetscOptionsEnd();
172: return(0);
173: }