Date: 2022-11-02T11:46:06+00:00

Actual source code: fnutilcuda.cu
slepc-3.18.1 2022-11-02
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      1: /*
      2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
      4:    Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain

      6:    This file is part of SLEPc.
      7:    SLEPc is distributed under a 2-clause BSD license (see LICENSE).
      8:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      9: */
     10: /*
     11:    Utility subroutines common to several impls
     12: */

     14: #include "fnutilcuda.h"

     16: __global__ void set_diagonal_kernel(PetscInt n,PetscScalar *d_pa,PetscInt ld,PetscScalar v,PetscInt xcount)
     17: {
     18:   PetscInt x;
     19:   x = xcount*gridDim.x*blockDim.x+blockIdx.x*blockDim.x+threadIdx.x;

     21:   if (x<n) {
     22:     d_pa[x+x*ld] = v;
     23:   }
     24: }

     26: __host__ PetscErrorCode set_diagonal(PetscInt n,PetscScalar *d_pa,PetscInt ld,PetscScalar v)
     27: {
     28:   PetscInt    i,dimGrid_xcount;
     29:   dim3        blocks3d,threads3d;

     31:   SlepcKernelSetGrid1D(n,&blocks3d,&threads3d,&dimGrid_xcount);
     32:   for (i=0;i<dimGrid_xcount;i++) {
     33:     set_diagonal_kernel<<<blocks3d, threads3d>>>(n,d_pa,ld,v,i);
     34:     cudaGetLastError();
     35:   }
     36:   return 0;
     37: }

     39: __global__ void set_Cdiagonal_kernel(PetscInt n,PetscComplex *d_pa,PetscInt ld,PetscReal vr,PetscReal vi,PetscInt xcount)
     40: {
     41:   PetscInt x;
     42:   x = xcount*gridDim.x*blockDim.x+blockIdx.x*blockDim.x+threadIdx.x;

     44:   if (x<n) {
     45:     d_pa[x+x*ld] = thrust::complex<PetscReal>(vr, vi);
     46:   }
     47: }

     49: __host__ PetscErrorCode set_Cdiagonal(PetscInt n,PetscComplex *d_pa,PetscInt ld,PetscReal vr,PetscReal vi)
     50: {
     51:   PetscInt    i,dimGrid_xcount;
     52:   dim3        blocks3d,threads3d;

     54:   SlepcKernelSetGrid1D(n,&blocks3d,&threads3d,&dimGrid_xcount);
     55:   for (i=0;i<dimGrid_xcount;i++) {
     56:     set_Cdiagonal_kernel<<<blocks3d, threads3d>>>(n,d_pa,ld,vr,vi,i);
     57:     cudaGetLastError();
     58:   }
     59:   return 0;
     60: }

     62: __global__ void shift_diagonal_kernel(PetscInt n,PetscScalar *d_pa,PetscInt ld,PetscScalar v,PetscInt xcount)
     63: {
     64:   PetscInt x;
     65:   x = xcount*gridDim.x*blockDim.x+blockIdx.x*blockDim.x+threadIdx.x;

     67:   if (x<n) {
     68:     d_pa[x+x*ld] += v;
     69:   }
     70: }

     72: __host__ PetscErrorCode shift_diagonal(PetscInt n,PetscScalar *d_pa,PetscInt ld,PetscScalar v)
     73: {
     74:   PetscInt    i,dimGrid_xcount;
     75:   dim3        blocks3d,threads3d;

     77:   SlepcKernelSetGrid1D(n,&blocks3d,&threads3d,&dimGrid_xcount);
     78:   for (i=0;i<dimGrid_xcount;i++) {
     79:     shift_diagonal_kernel<<<blocks3d, threads3d>>>(n,d_pa,ld,v,i);
     80:     cudaGetLastError();
     81:   }
     82:   return 0;
     83: }

     85: __global__ void shift_Cdiagonal_kernel(PetscInt n,PetscComplex *d_pa,PetscInt ld,PetscReal vr,PetscReal vi,PetscInt xcount)
     86: {
     87:   PetscInt x;
     88:   x = xcount*gridDim.x*blockDim.x+blockIdx.x*blockDim.x+threadIdx.x;

     90:   if (x<n) {
     91:     d_pa[x+x*ld] += thrust::complex<PetscReal>(vr, vi);
     92:   }
     93: }

     95: __host__ PetscErrorCode shift_Cdiagonal(PetscInt n,PetscComplex *d_pa,PetscInt ld,PetscReal vr,PetscReal vi)
     96: {
     97:   PetscInt    i,dimGrid_xcount;
     98:   dim3        blocks3d,threads3d;

    100:   SlepcKernelSetGrid1D(n,&blocks3d,&threads3d,&dimGrid_xcount);
    101:   for (i=0;i<dimGrid_xcount;i++) {
    102:     shift_Cdiagonal_kernel<<<blocks3d, threads3d>>>(n,d_pa,ld,vr,vi,i);
    103:     cudaGetLastError();
    104:   }
    105:   return 0;
    106: }

    108: __global__ void copy_array2D_S2C_kernel(PetscInt m,PetscInt n,PetscComplex *d_pa,PetscInt lda,PetscScalar *d_pb,PetscInt ldb,PetscInt xcount,PetscInt ycount)
    109: {
    110:   PetscInt x,y,i,j;

    112:   x = xcount*gridDim.x*blockDim.x+blockIdx.x*blockDim.x+threadIdx.x;
    113:   y = ycount*gridDim.y*blockDim.y+blockIdx.y*blockDim.y+threadIdx.y;
    114:   for (j=y;j<n;j+=blockDim.y) {
    115:     for (i=x;i<m;i+=blockDim.x) {
    116:       d_pa[i+j*lda] = d_pb[i+j*ldb];
    117:     }
    118:   }
    119: }

    121: __host__ PetscErrorCode copy_array2D_S2C(PetscInt m,PetscInt n,PetscComplex *d_pa,PetscInt lda,PetscScalar *d_pb,PetscInt ldb)
    122: {
    123:   PetscInt    i,j,dimGrid_xcount,dimGrid_ycount;
    124:   dim3        blocks3d,threads3d;

    126:   SlepcKernelSetGrid2DTiles(m,n,&blocks3d,&threads3d,&dimGrid_xcount,&dimGrid_ycount);
    127:   for (i=0;i<dimGrid_xcount;i++) {
    128:     for (j=0;j<dimGrid_ycount;j++) {
    129:       copy_array2D_S2C_kernel<<<blocks3d,threads3d>>>(m,n,d_pa,lda,d_pb,ldb,i,j);
    130:       cudaGetLastError();
    131:     }
    132:   }
    133:   return 0;
    134: }

    136: __global__ void copy_array2D_C2S_kernel(PetscInt m,PetscInt n,PetscScalar *d_pa,PetscInt lda,PetscComplex *d_pb,PetscInt ldb,PetscInt xcount,PetscInt ycount)
    137: {
    138:   PetscInt x,y,i,j;

    140:   x = xcount*gridDim.x*blockDim.x+blockIdx.x*blockDim.x+threadIdx.x;
    141:   y = ycount*gridDim.y*blockDim.y+blockIdx.y*blockDim.y+threadIdx.y;
    142:   for (j=y;j<n;j+=blockDim.y) {
    143:     for (i=x;i<m;i+=blockDim.x) {
    144:       d_pa[i+j*lda] = PetscRealPartComplex(d_pb[i+j*ldb]);
    145:     }
    146:   }
    147: }

    149: __host__ PetscErrorCode copy_array2D_C2S(PetscInt m,PetscInt n,PetscScalar *d_pa,PetscInt lda,PetscComplex *d_pb,PetscInt ldb)
    150: {
    151:   PetscInt    i,j,dimGrid_xcount,dimGrid_ycount;
    152:   dim3        blocks3d,threads3d;

    154:   SlepcKernelSetGrid2DTiles(m,n,&blocks3d,&threads3d,&dimGrid_xcount,&dimGrid_ycount);
    155:   for (i=0;i<dimGrid_xcount;i++) {
    156:     for (j=0;j<dimGrid_ycount;j++) {
    157:       copy_array2D_C2S_kernel<<<blocks3d,threads3d>>>(m,n,d_pa,lda,d_pb,ldb,i,j);
    158:       cudaGetLastError();
    159:     }
    160:   }
    161:   return 0;
    162: }

    164: __global__ void add_array2D_Conj_kernel(PetscInt m,PetscInt n,PetscComplex *d_pa,PetscInt lda,PetscInt xcount,PetscInt ycount)
    165: {
    166:   PetscInt x,y,i,j;

    168:   x = xcount*gridDim.x*blockDim.x+blockIdx.x*blockDim.x+threadIdx.x;
    169:   y = ycount*gridDim.y*blockDim.y+blockIdx.y*blockDim.y+threadIdx.y;
    170:   for (j=y;j<n;j+=blockDim.y) {
    171:     for (i=x;i<m;i+=blockDim.x) {
    172:       d_pa[i+j*lda] += PetscConj(d_pa[i+j*lda]);
    173:     }
    174:   }
    175: }

    177: __host__ PetscErrorCode add_array2D_Conj(PetscInt m,PetscInt n,PetscComplex *d_pa,PetscInt lda)
    178: {
    179:   PetscInt    i,j,dimGrid_xcount,dimGrid_ycount;
    180:   dim3        blocks3d,threads3d;

    182:   SlepcKernelSetGrid2DTiles(m,n,&blocks3d,&threads3d,&dimGrid_xcount,&dimGrid_ycount);
    183:   for (i=0;i<dimGrid_xcount;i++) {
    184:     for (j=0;j<dimGrid_ycount;j++) {
    185:       add_array2D_Conj_kernel<<<blocks3d,threads3d>>>(m,n,d_pa,lda,i,j);
    186:       cudaGetLastError();
    187:     }
    188:   }
    189:   return 0;
    190: }

    192: __global__ void getisreal_array2D_kernel(PetscInt m,PetscInt n,PetscComplex *d_pa,PetscInt lda,PetscBool *d_result,PetscInt xcount,PetscInt ycount)
    193: {
    194:   PetscInt x,y,i,j;

    196:   x = xcount*gridDim.x*blockDim.x+blockIdx.x*blockDim.x+threadIdx.x;
    197:   y = ycount*gridDim.y*blockDim.y+blockIdx.y*blockDim.y+threadIdx.y;
    198:   if (*d_result) {
    199:     for (j=y;j<n;j+=blockDim.y) {
    200:       for (i=x;i<m;i+=blockDim.x) {
    201:         if (PetscImaginaryPartComplex(d_pa[i+j*lda])) *d_result=PETSC_FALSE;
    202:       }
    203:     }
    204:   }
    205: }

    207: __host__ PetscErrorCode getisreal_array2D(PetscInt m,PetscInt n,PetscComplex *d_pa,PetscInt lda,PetscBool *d_result)
    208: {
    209:   PetscInt    i,j,dimGrid_xcount,dimGrid_ycount;
    210:   PetscBool   result=PETSC_TRUE;
    211:   dim3        blocks3d,threads3d;

    213:   cudaMemcpy(d_result,&result,sizeof(PetscBool),cudaMemcpyHostToDevice);
    214:   SlepcKernelSetGrid2DTiles(m,n,&blocks3d,&threads3d,&dimGrid_xcount,&dimGrid_ycount);
    215:   for (i=0;i<dimGrid_xcount;i++) {
    216:     for (j=0;j<dimGrid_ycount;j++) {
    217:       getisreal_array2D_kernel<<<blocks3d,threads3d>>>(m,n,d_pa,lda,d_result,i,j);
    218:       cudaGetLastError();
    219:     }
    220:   }
    221:   return 0;
    222: }

    224: __global__ void mult_diagonal_kernel(PetscInt n,PetscScalar *d_pa,PetscInt ld,PetscScalar *d_v,PetscInt xcount)
    225: {
    226:   PetscInt               x;
    227:   unsigned int           bs=blockDim.x;
    228:   __shared__ PetscScalar shrdres[SLEPC_BLOCK_SIZE_X];

    230:   x = xcount*gridDim.x*blockDim.x+blockIdx.x*blockDim.x+threadIdx.x;
    231:   shrdres[threadIdx.x] = (x<n)? d_pa[x+ld*x]: 1.0;
    232:   __syncthreads();

    234:   /* reduction */
    235:   if ((bs >= 512) && (threadIdx.x < 256)) { shrdres[threadIdx.x] *= shrdres[threadIdx.x + 256]; } __syncthreads();
    236:   if ((bs >= 256) && (threadIdx.x < 128)) { shrdres[threadIdx.x] *= shrdres[threadIdx.x + 128]; } __syncthreads();
    237:   if ((bs >= 128) && (threadIdx.x <  64)) { shrdres[threadIdx.x] *= shrdres[threadIdx.x +  64]; } __syncthreads();
    238:   if ((bs >=  64) && (threadIdx.x <  32)) { shrdres[threadIdx.x] *= shrdres[threadIdx.x +  32]; } __syncthreads();
    239:   if ((bs >=  32) && (threadIdx.x <  16)) { shrdres[threadIdx.x] *= shrdres[threadIdx.x +  16]; } __syncthreads();
    240:   if ((bs >=  16) && (threadIdx.x <   8)) { shrdres[threadIdx.x] *= shrdres[threadIdx.x +   8]; } __syncthreads();
    241:   if ((bs >=   8) && (threadIdx.x <   4)) { shrdres[threadIdx.x] *= shrdres[threadIdx.x +   4]; } __syncthreads();
    242:   if ((bs >=   4) && (threadIdx.x <   2)) { shrdres[threadIdx.x] *= shrdres[threadIdx.x +   2]; } __syncthreads();
    243:   if ((bs >=   2) && (threadIdx.x <   1)) { shrdres[threadIdx.x] *= shrdres[threadIdx.x +   1]; } __syncthreads();
    244:   if (threadIdx.x == 0) d_v[blockIdx.x] = shrdres[threadIdx.x];
    245: }

    247: __host__ PetscErrorCode mult_diagonal(PetscInt n,PetscScalar *d_pa,PetscInt ld,PetscScalar *v)
    248: {
    249:   PetscInt    i,j,dimGrid_xcount;
    250:   PetscScalar *part,*d_part;
    251:   dim3        blocks3d,threads3d;

    253:   SlepcKernelSetGrid1D(n,&blocks3d,&threads3d,&dimGrid_xcount);
    254:   cudaMalloc((void **)&d_part,sizeof(PetscScalar)*blocks3d.x);
    255:   PetscMalloc1(blocks3d.x,&part);
    256:   for (i=0;i<dimGrid_xcount;i++) {
    257:     mult_diagonal_kernel<<<blocks3d,threads3d>>>(n,d_pa,ld,d_part,i);
    258:     cudaGetLastError();
    259:     cudaMemcpy(part,d_part,blocks3d.x*sizeof(PetscScalar),cudaMemcpyDeviceToHost);
    260:     if (i == 0) {
    261:       *v = part[0];
    262:       j=1;
    263:     } else j=0;
    264:     for (; j<(int)blocks3d.x; j++) *v *= part[j];
    265:   }
    266:   cudaFree(d_part);
    267:   PetscFree(part);
    268:   return 0;
    269: }