gs.cu

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/*
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#include <climits>
#include <cstdio>
#include <device/device_config.h>
#include <device/cuda/check.h>
#include "gs_kernels.h"
 
#define GS_OP_ADD  1
#define GS_OP_MUL  2
#define GS_OP_MIN  3
#define GS_OP_MAX  4
 
extern "C" {
 
  void cuda_gather_kernel(void *v, int *m, int *o, void *dg,
                          void *u, int *n, void *gd, int *nb,
                          void *b, void *bo, int *op,
                          cudaStream_t stream) {
 
    if ((*m) == 0) return;
 
    const dim3 nthrds(1024, 1, 1);
    const dim3 nblcks(((*m)+ 1024 - 1)/ 1024, 1, 1);
 
    switch (*op) {
    case GS_OP_ADD:
      gather_kernel_add<real>
        <<<nblcks, nthrds, 0, stream>>>((real *) v, *m, *o, (int *) dg,
                                        (real *) u, *n, (int *) gd,
                                        *nb, (int *) b, (int *) bo);
      CUDA_CHECK(cudaGetLastError());
      break;
    case GS_OP_MUL:
      gather_kernel_mul<real>
        <<<nblcks, nthrds, 0, stream>>>((real *) v, *m, *o, (int *) dg,
                                        (real *) u, *n, (int *) gd,
                                        *nb, (int *) b, (int *) bo);
      CUDA_CHECK(cudaGetLastError());
      break;
    case GS_OP_MIN:
      gather_kernel_min<real>
        <<<nblcks, nthrds, 0, stream>>>((real *) v, *m, *o, (int *) dg,
                                        (real *) u, *n, (int *) gd,
                                        *nb, (int *) b, (int *) bo);
      CUDA_CHECK(cudaGetLastError());
      break;
    case GS_OP_MAX:
      gather_kernel_max<real>
        <<<nblcks, nthrds, 0, stream>>>((real *) v, *m, *o, (int *) dg,
                                        (real *) u, *n, (int *) gd,
                                        *nb, (int *) b, (int *) bo);
      CUDA_CHECK(cudaGetLastError());
      break;
    }
  }
 
  void cuda_scatter_kernel(void *v, int *m, void *dg,
                           void *u, int *n, void *gd,
                           int *nb, void *b, void *bo,
                           cudaStream_t stream) {
 
    if ((*m) == 0) return;
 
    const dim3 nthrds(1024, 1, 1);
    const dim3 nblcks(((*m)+1024 - 1)/ 1024, 1, 1);
 
    scatter_kernel<real>
      <<<nblcks, nthrds, 0, stream>>>((real *) v, *m, (int *) dg,
                                      (real *) u, *n, (int *) gd,
                                      *nb, (int *) b, (int *) bo);
    CUDA_CHECK(cudaGetLastError());
  }
 
  void cuda_gs_pack(void *u_d, void *buf_d, void *dof_d,
                    int offset, int n, cudaStream_t stream) {
 
    const int nthrds = 1024;
    const int nblcks = (n + nthrds - 1) / nthrds;
 
    gs_pack_kernel<real>
      <<<nblcks, nthrds, 0, stream>>>((real *) u_d, (real *) buf_d + offset,
                                      (int *) dof_d + offset, n);
 
    CUDA_CHECK(cudaGetLastError());
  }
 
  void cuda_gs_unpack(real *u_d, int op, real *buf_d, int *dof_d,
                      int offset, int n, cudaStream_t stream) {
 
    const int nthrds = 1024;
    const int nblcks = (n + nthrds - 1) / nthrds;
 
    switch (op) {
    case GS_OP_ADD:
      gs_unpack_add_kernel<real>
        <<<nblcks, nthrds, 0, stream>>>(u_d, buf_d + offset,
                                        dof_d + offset, n);
      break;
    case GS_OP_MIN:
      gs_unpack_min_kernel<real>
        <<<nblcks, nthrds, 0, stream>>>(u_d, buf_d + offset,
                                        dof_d + offset, n);
      break;
    case GS_OP_MAX:
      gs_unpack_max_kernel<real>
          <<<nblcks, nthrds, 0, stream>>>(u_d, buf_d + offset,
                                          dof_d + offset, n);
      break;
    default:
      printf("%s: unknown gs op %d\n", __FILE__, op);
      abort();
    }
 
    CUDA_CHECK(cudaGetLastError());
  }
}