projection.cu

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/*
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#include <device/device_config.h>
#include <device/cuda/check.h>
#include <device/cuda/buffer.h>
 
#include "projection_kernel.h"
#include <math/bcknd/device/cuda/math_kernel.h>
 
 
/*
 * Device-only reduction buffer, owned by the device layer and
 * released on device teardown (cuda_buffer_free_all in cuda_finalize)
 */
cuda_buffer_t proj_bufred = CUDA_BUFFER_INIT_DEV;
 
extern "C" {
 
#include <math/bcknd/device/device_mpi_reduce.h>
#include <math/bcknd/device/device_mpi_op.h>
 
  void cuda_project_on(void *alpha, void * b, void *xx, void *bb, void *mult,
                       void *xbar, int *j, int *n){ 
 
    const cudaStream_t stream = (cudaStream_t) glb_cmd_queue;
    int pow2 = 1;
    while(pow2 < (*j)){
      pow2 = 2*pow2;
    }
    const int nt = 1024/pow2;   
    const dim3 glsc3_nthrds(pow2, nt, 1);
    const dim3 glsc3_nblcks(((*n)+nt - 1)/nt, 1, 1);
    const int glsc3_nb = ((*n) + nt - 1)/nt;
    cuda_buffer_reserve(&proj_bufred, (*j)*glsc3_nb*sizeof(real));
    real *proj_bufred_d = (real *) proj_bufred.dev;
 
    /* First glsc3_many call */
    glsc3_many_kernel<real>
      <<<glsc3_nblcks, glsc3_nthrds, 0, stream>>>((const real *) b,
                                                  (const real **) xx,
                                                  (const real *) mult,
                                                  proj_bufred_d, *j, *n);
    CUDA_CHECK(cudaGetLastError());
    glsc3_reduce_kernel<real>
      <<<(*j), 1024, 0, stream>>>(proj_bufred_d, glsc3_nb, *j);
    CUDA_CHECK(cudaGetLastError());
    CUDA_CHECK(cudaMemcpyAsync(alpha, proj_bufred_d, (*j) * sizeof(real),
                               cudaMemcpyDeviceToDevice, stream));
    CUDA_CHECK(cudaMemsetAsync(xbar, 0, (*n) * sizeof(real), stream));
 
    cudaStreamSynchronize(stream);
    device_mpi_allreduce_inplace(alpha, (*j), sizeof(real), DEVICE_MPI_SUM);
 
    const dim3 vec_nthrds(1024, 1, 1);
    const dim3 vec_nblcks(((*n)+1024 - 1)/ 1024, 1, 1);
 
    /* First vector operation block */
    project_on_vec_kernel<real>
      <<<vec_nblcks, vec_nthrds, 0, stream>>>((real *) xbar,
                                              (const real **) xx,
                                              (real *) b,
                                              (const real **) bb,
                                              (const real *) alpha,
                                              *j, *n);
    /* Second glsc3_many call */
    glsc3_many_kernel<real>
      <<<glsc3_nblcks, glsc3_nthrds, 0, stream>>>((const real *) b,
                                                  (const real **) xx,
                                                  (const real *) mult,
                                                  proj_bufred_d, *j, *n);
    CUDA_CHECK(cudaGetLastError());
    glsc3_reduce_kernel<real>
      <<<(*j), 1024, 0, stream>>>(proj_bufred_d, glsc3_nb, *j);
    CUDA_CHECK(cudaGetLastError());
    CUDA_CHECK(cudaMemcpyAsync(alpha, proj_bufred_d, (*j) * sizeof(real),
                               cudaMemcpyDeviceToDevice, stream));
 
    cudaStreamSynchronize(stream);
    device_mpi_allreduce_inplace(alpha, (*j), sizeof(real), DEVICE_MPI_SUM);
 
    /* Second vector operation block */
    project_on_vec_kernel<real>
      <<<vec_nblcks, vec_nthrds, 0, stream>>>((real *) xbar,
                                              (const real **) xx,
                                              (real *) b,
                                              (const real **) bb,
                                              (const real *) alpha,
                                              *j, *n);
  }
 
  void cuda_project_ortho(void *alpha, void * b, void *xx, void *bb,
                          void *w, void *xm, int *j, int *n, real *nrm){
 
    const cudaStream_t stream = (cudaStream_t) glb_cmd_queue;
    
    int pow2 = 1;
    while(pow2 < (*j)){
      pow2 = 2*pow2;
    }
    const int nt = 1024/pow2;   
    const dim3 glsc3_nthrds(pow2, nt, 1);
    const dim3 glsc3_nblcks(((*n)+nt - 1)/nt, 1, 1);
    const int glsc3_nb = ((*n) + nt - 1)/nt;
    cuda_buffer_reserve(&proj_bufred, (*j)*glsc3_nb*sizeof(real));
    real *proj_bufred_d = (real *) proj_bufred.dev;
 
    /* First glsc3_many call */
    glsc3_many_kernel<real>
      <<<glsc3_nblcks, glsc3_nthrds, 0, stream>>>((const real *) b,
                                                  (const real **) xx,
                                                  (const real *) w,
                                                  proj_bufred_d, *j, *n);
    CUDA_CHECK(cudaGetLastError());
    glsc3_reduce_kernel<real>
      <<<(*j), 1024, 0, stream>>>(proj_bufred_d, glsc3_nb, *j);
    CUDA_CHECK(cudaGetLastError());
    CUDA_CHECK(cudaMemcpyAsync(alpha, proj_bufred_d, (*j) * sizeof(real),
                               cudaMemcpyDeviceToDevice, stream));
 
    cudaStreamSynchronize(stream);
    device_mpi_allreduce_inplace(alpha, (*j), sizeof(real), DEVICE_MPI_SUM);
 
    CUDA_CHECK(cudaMemcpyAsync(nrm, (real *) alpha + (*j - 1),
                               sizeof(real), cudaMemcpyDeviceToHost, stream));
    (*nrm) = sqrt(*nrm);
 
 
    const dim3 vec_nthrds(1024, 1, 1);
    const dim3 vec_nblcks(((*n)+1024 - 1)/ 1024, 1, 1);
 
    /* First vector operation block */
    project_ortho_vec_kernel<real>
      <<<vec_nblcks, vec_nthrds, 0, stream>>>((real *) xm, (const real **) xx,
                                              (real *) b, (const real **) bb,
                                              (const real *) alpha, *j, *n);
 
    /* Second glsc3_many call */
    glsc3_many_kernel<real>
      <<<glsc3_nblcks, glsc3_nthrds, 0, stream>>>((const real *) b,
                                                  (const real **) xx,
                                                  (const real *) w,
                                                  proj_bufred_d, *j, *n);
    CUDA_CHECK(cudaGetLastError());
    glsc3_reduce_kernel<real>
      <<<(*j), 1024, 0, stream>>> (proj_bufred_d, glsc3_nb, *j);
    CUDA_CHECK(cudaGetLastError());
    CUDA_CHECK(cudaMemcpyAsync(alpha, proj_bufred_d, (*j) * sizeof(real),
                               cudaMemcpyDeviceToDevice, stream));
 
    cudaStreamSynchronize(stream);
    device_mpi_allreduce_inplace(alpha, (*j), sizeof(real), DEVICE_MPI_SUM);
 
    /* Second vector operation block */
    project_ortho_vec_kernel<real>
      <<<vec_nblcks, vec_nthrds, 0, stream>>>((real *) xm, (const real **) xx,
                                              (real *) b, (const real **) bb,
                                              (const real *) alpha, *j, *n);
    
  }
      
}