gmres_aux.hip

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/*
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#include <stdio.h>
#include <hip/hip_runtime.h>
#include "gmres_kernel.h"
#include <device/device_config.h>
#include <device/hip/check.h>
 
extern "C" {
 
#include <math/bcknd/device/device_mpi_reduce.h>
#include <math/bcknd/device/device_mpi_op.h>
  
  real * gmres_bf1 = NULL;
  real * gmres_bfd1 = NULL;
  int gmres_bf_len = 0;  
 
  real hip_gmres_part2(void *w, void *v, void *h, void * mult, int *j, int *n) {
    
    const dim3 nthrds(1024, 1, 1);
    const dim3 nblcks(((*n)+1024 - 1)/ 1024, 1, 1);
    const int nb = ((*n) + 1024 - 1)/ 1024;
    
    if (gmres_bf1 != NULL && gmres_bf_len < nb) {
      HIP_CHECK(hipHostFree(gmres_bf1));
      HIP_CHECK(hipFree(gmres_bfd1));
      gmres_bf1 = NULL;
    }
 
    if (gmres_bf1 == NULL){
      HIP_CHECK(hipHostMalloc(&gmres_bf1, nb*sizeof(real)));
      HIP_CHECK(hipMalloc(&gmres_bfd1, nb*sizeof(real)));
      gmres_bf_len = nb;
    }
     
    hipLaunchKernelGGL(HIP_KERNEL_NAME(gmres_part2_kernel<real>),
               nblcks, nthrds, 0, (hipStream_t) glb_cmd_queue,
                       (real *) w, (real **) v, (real *) mult,
                       (real *) h, gmres_bfd1, *j, *n);
    HIP_CHECK(hipGetLastError());
    hipLaunchKernelGGL(HIP_KERNEL_NAME(reduce_kernel<real>),
                       1, 1024, 0, (hipStream_t) glb_cmd_queue, gmres_bfd1, nb);
    HIP_CHECK(hipGetLastError());
 
#ifdef HAVE_DEVICE_MPI
    HIP_CHECK(hipStreamSynchronize((hipStream_t) glb_cmd_queue));
    device_mpi_allreduce(gmres_bfd1, gmres_bf1, 1, sizeof(real), DEVICE_MPI_SUM);
#else
    
    HIP_CHECK(hipMemcpyAsync(gmres_bf1, gmres_bfd1, sizeof(real),
                             hipMemcpyDeviceToHost,
                             (hipStream_t) glb_cmd_queue));
    HIP_CHECK(hipStreamSynchronize((hipStream_t) glb_cmd_queue));
#endif
    return gmres_bf1[0];
 
  }
}