opr_cdtp.cu

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/*
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   * Neither the name of the authors nor the names of its
     contributors may be used to endorse or promote products derived
     from this software without specific prior written permission.
 
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 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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*/
 
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "cdtp_kernel.h"
#include <device/device_config.h>
#include <device/cuda/check.h>
 
extern "C" {
  #include <common/neko_log.h>
}
 
template < const int >
int tune_cdtp(void *dtx, void *x,
              void *dr, void *ds, void *dt,
              void *dxt, void *dyt, void *dzt,
              void *w3, int *nel, int *lx);
 
extern "C" {
 
  void cuda_cdtp(void *dtx, void *x,
                 void *dr, void *ds, void *dt,
                 void *dxt, void *dyt, void *dzt,
                 void *w3, int *nel, int *lx) {
    
    static int autotune[17] = { 0 };
    
    const dim3 nthrds_1d(1024, 1, 1);
    const dim3 nthrds_kstep((*lx), (*lx), 1);
    const dim3 nblcks((*nel), 1, 1);
    const cudaStream_t stream = (cudaStream_t) glb_cmd_queue;
 
#define CASE_1D(LX)                                                             \
    cdtp_kernel_1d<real, LX, 1024>                                              \
      <<<nblcks, nthrds_1d, 0, stream>>>((real *) dtx, (real *) x,              \
                              (real *) dr, (real *) ds, (real *) dt,            \
                              (real *) dxt, (real *) dyt, (real *) dzt,         \
                              (real *) w3);                                     \
    CUDA_CHECK(cudaGetLastError());
 
#define CASE_KSTEP(LX)                                                          \
    cdtp_kernel_kstep<real, LX>                                                 \
      <<<nblcks, nthrds_kstep, 0, stream>>>((real *) dtx, (real *) x,           \
                                 (real *) dr, (real *) ds, (real *) dt,         \
                                 (real *) dxt, (real *) dyt, (real *) dzt,      \
                                 (real *) w3);                                  \
    CUDA_CHECK(cudaGetLastError());
 
#define CASE(LX)                                                                \
    case LX:                                                                    \
      if(autotune[LX] == 0 ) {                                                  \
        autotune[LX]=tune_cdtp<LX>(dtx, x,                                      \
                                   dr, ds, dt,                                  \
                                   dxt, dyt, dzt,                               \
                                   w3, nel, lx);                                \
      } else if (autotune[LX] == 1 ) {                                          \
        CASE_1D(LX);                                                            \
      } else if (autotune[LX] == 2 ) {                                          \
        CASE_KSTEP(LX);                                                         \
      }                                                                         \
      break
 
#define CASE_LARGE(LX)                                                          \
    case LX:                                                                    \
      CASE_KSTEP(LX);                                                           \
      break
 
 
    if ((*lx) < 13) {      
      switch(*lx) {
        CASE(2);
        CASE(3);
        CASE(4);
        CASE(5);
        CASE(6);
        CASE(7);
        CASE(8);
        CASE(9);
        CASE(10);
        CASE(11);
        CASE(12);
      default:
        {
          fprintf(stderr, __FILE__ ": size not supported: %d\n", *lx);
          exit(1);
        }
      }
    }
    else {
      switch(*lx) {
        CASE_LARGE(13);
        CASE_LARGE(14);
        CASE_LARGE(15);
        CASE_LARGE(16);
      default:
        {
          fprintf(stderr, __FILE__ ": size not supported: %d\n", *lx);
          exit(1);
        }
      } 
    }
  } 
}    
 
template < const int LX >
int tune_cdtp(void *dtx, void *x,
              void *dr, void *ds, void *dt,
              void *dxt, void *dyt, void *dzt,
              void *w3, int *nel, int *lx) {
  cudaEvent_t start,stop;
  float time1,time2;
  int retval;
 
  const dim3 nthrds_1d(1024, 1, 1);
  const dim3 nthrds_kstep((*lx), (*lx), 1);
  const dim3 nblcks((*nel), 1, 1);
  const cudaStream_t stream = (cudaStream_t) glb_cmd_queue;
  
  char *env_value = NULL;
  char neko_log_buf[80];
  
  env_value=getenv("NEKO_AUTOTUNE");
 
  sprintf(neko_log_buf, "Autotune cdtp (lx: %d)", *lx);
  log_section(neko_log_buf);
  
  if(env_value) {
    if( !strcmp(env_value,"1D") ) {
      CASE_1D(LX);       
      sprintf(neko_log_buf,"Set by env : 1 (1D)");
      log_message(neko_log_buf);
      log_end_section();
      return 1;
    } else if( !strcmp(env_value,"KSTEP") ) {
      CASE_KSTEP(LX);
      sprintf(neko_log_buf,"Set by env : 2 (KSTEP)");
      log_message(neko_log_buf);
      log_end_section();
      return 2;
    } else {       
       sprintf(neko_log_buf, "Invalid value set for NEKO_AUTOTUNE");
       log_error(neko_log_buf);
    }
  }
 
  cudaEventCreate(&start);
  cudaEventCreate(&stop);
  
  cudaEventRecord(start,0);
   
  for(int i = 0; i < 100; i++) {
    CASE_1D(LX);
  }
  
  cudaEventRecord(stop,0); 
  cudaEventSynchronize(stop);
  cudaEventElapsedTime(&time1, start, stop);
  
  cudaEventRecord(start,0);
   
  for(int i = 0; i < 100; i++) {
     CASE_KSTEP(LX);
   }
  
  cudaEventRecord(stop,0); 
  cudaEventSynchronize(stop);
  cudaEventElapsedTime(&time2, start, stop);
  
  if(time1 < time2) {
     retval = 1;
  } else {
    retval = 2;
  }
 
  sprintf(neko_log_buf, "Chose      : %d (%s)", retval,
          (retval > 1 ? "KSTEP" : "1D"));
  log_message(neko_log_buf);
  log_end_section();
  return retval;
}