pipecg_aux.cu

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/*
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     from this software without specific prior written permission.
 
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#include "pipecg_kernel.h"
#include <device/device_config.h>
#include <device/cuda/check.h>
#include <device/cuda/buffer.h>
 
cuda_buffer_t pipecg_buf = CUDA_BUFFER_INIT;
 
extern "C" {
  
  void cuda_cg_update_xp(void *x, void *p, void *u, void *alpha, void *beta,
                         int *p_cur, int *p_space, int *n) {
        
    const dim3 nthrds(1024, 1, 1);
    const dim3 nblcks(((*n)+1024 - 1)/ 1024, 1, 1);
    const cudaStream_t stream = (cudaStream_t) glb_cmd_queue;
    
    cg_update_xp_kernel<real>
      <<<nblcks, nthrds, 0, stream>>>((real *) x, (real *) p,
                                      (real **) u, (real *) alpha,
                                      (real *) beta, *p_cur, *p_space, *n);
    CUDA_CHECK(cudaGetLastError());
 
  }
 
  void cuda_pipecg_vecops(void *p, void *q, void *r, void *s, void *u1,
                            void *u2, void *w, void *z, 
                            void *ni, void *mi, real *alpha, 
                            real *beta, void *mult, 
                            real *reduction, int *n) {
        
    const dim3 nthrds(1024, 1, 1);
    const dim3 nblcks(((*n)+1024 - 1)/ 1024, 1, 1);
    const int nb = ((*n) + 1024 - 1)/ 1024;
    const cudaStream_t stream = (cudaStream_t) glb_cmd_queue;
 
    cuda_buffer_reserve(&pipecg_buf, 3*nb*sizeof(real));
    real *buf = (real *) pipecg_buf.host;
    real *buf_d1 = (real *) pipecg_buf.dev;
    real *buf_d2 = buf_d1 + nb;
    real *buf_d3 = buf_d1 + 2*nb;
     
    pipecg_vecops_kernel<real>
      <<<nblcks, nthrds, 0, stream>>>((real *) p, (real *) q,
                                      (real *) r, (real *) s,
                                      (real *) u1, (real *) u2,
                                      (real *) w, (real *) z,
                                      (real *) ni, (real *) mi, 
                                      *alpha, *beta, (real *)mult, 
                                      buf_d1, buf_d2, buf_d3, *n);
    
    CUDA_CHECK(cudaGetLastError());
 
    reduce_kernel<real><<<1, 1024, 0, stream>>>(buf_d1, nb);
    CUDA_CHECK(cudaGetLastError());
    reduce_kernel<real><<<1, 1024, 0, stream>>>(buf_d2, nb);
    CUDA_CHECK(cudaGetLastError());
    reduce_kernel<real><<<1, 1024, 0, stream>>>(buf_d3, nb);
    CUDA_CHECK(cudaGetLastError());
    
    CUDA_CHECK(cudaMemcpyAsync(&buf[0], buf_d1, sizeof(real),
                               cudaMemcpyDeviceToHost, stream));
    CUDA_CHECK(cudaGetLastError());
    CUDA_CHECK(cudaMemcpyAsync(&buf[1], buf_d2, sizeof(real),
                               cudaMemcpyDeviceToHost, stream));
    CUDA_CHECK(cudaGetLastError());
    CUDA_CHECK(cudaMemcpyAsync(&buf[2], buf_d3, sizeof(real),
                               cudaMemcpyDeviceToHost, stream));
    CUDA_CHECK(cudaGetLastError());
 
    CUDA_CHECK(cudaStreamSynchronize(stream));
 
    reduction[0] = buf[0];
    reduction[1] = buf[1];
    reduction[2] = buf[2];
    
  }
}