gs_nvshmem.cu

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/*
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#include <device/device_config.h>
#include <device/cuda/check.h>
#ifdef HAVE_NVSHMEM
#include <nvshmem.h>
#include "gs_nvshmem_kernels.h"
#endif
 
extern "C" {
 
#ifdef HAVE_NVSHMEM
  void cudamalloc_nvshmem(void** ptr, size_t size)
  {
    *ptr = nvshmem_malloc(size);
    CUDA_CHECK(cudaGetLastError());
    cudaMemset(*ptr, 0, size);
    CUDA_CHECK(cudaGetLastError());
  }    
  
  void cudafree_nvshmem(void** ptr, size_t size)
  {
    nvshmem_free(*ptr);
    CUDA_CHECK(cudaGetLastError());
  }
  
  void cuda_gs_pack_and_push(void *u_d, void *sbuf_d, void *sdof_d,
                             int soffset, int n, cudaStream_t stream,
                             int srank,  void *rbuf_d, int roffset, int* remote_offset,
                 int rrank, int counter, void* notifyDone, void* notifyReady,
                 int iter)
 
  {
    
    const int nthrds = 1024;
    const int nblcks = (n+nthrds-1)/nthrds;
 
    pack_pushShmemKernel<real>
      <<<nblcks,nthrds,0,stream>>>((real *) u_d,
                                   (real *) rbuf_d + remote_offset[iter-1],
                                   (real *) sbuf_d + soffset,
                                   (int *) sdof_d + soffset,
                                   srank, rrank, n, counter,
                                   (uint64_t*) notifyDone,
                                   (uint64_t*) notifyReady);         
    CUDA_CHECK(cudaGetLastError());
  }
 
  void cuda_gs_pack_and_push_wait(cudaStream_t stream, int counter, void* notifyDone)
  {
    uint64_t counter_ = (uint64_t) counter;
    pushShmemKernelWait<<<1,1,0,stream>>>(counter_,(uint64_t*) notifyDone);
    CUDA_CHECK(cudaGetLastError());
  }
#endif
}