dram.cc

来自「M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作」· CC 代码 · 共 1,471 行 · 第 1/5 页

                                full_overlapping++;
                              }
                            else/*in between case*/
                              {
                                lat = SD_T_READ_READ_SBANK-corrected_overlap;
                                in_between_case++;
                                partial_overlapping++;
                              }
                          }
                        else/*worst case*/
                          {
                            lat = SD_T_READ_READ_SBANK;
                            worst_case++;
                          }
                        same_bank_read_access++;
                        sbr_after_read++;
                      }
                    else/*write*/
                      {/*no option case*/
                        lat = SD_T_WRITE_WRITE_SBANK;
                        same_bank_write_access++;
                        sbw_after_write++;
                        worst_case++;
                      }
                  }
              }
            else /*other bank*/
              {
                if (cmdIsRead)
                  {
                        /* Page empty */
                    if (current_row == active_row[current_bank])/*row is still active*/
                      {
                        if (corrected_overlap > 0 )/*overlapping*/
                          {
                            if(corrected_overlap >= pre_lat)/*best case*/
                              {
                                lat = SD_BEST_T_READ_READ_OBANK;
                                best_case++;
                                full_overlapping++;
                              }
                            else/*in between case*/
                              {
                                lat = SD_T_READ_READ_OBANK - corrected_overlap;
                                in_between_case++;
                                partial_overlapping++;
                              }
                          }
                        else/*in between case*/
                          {
                            lat = SD_T_READ_READ_OBANK;
                            in_between_case++;
                          }
                        other_bank_read_access_hit++;
                        obr_after_read_hit++;
                      }
                    else/*row is not active*/
                      {
                        if (corrected_overlap > 0 )/*overlapping*/
                          {
                            if(corrected_overlap >= SD_T_READ_READ_OBANK )/*best case*/
                              {
                                lat = SD_BEST_T_READ_READ_OBANK;
                                best_case++;
                                full_overlapping++;
                              }
                            else/*in between case*/
                              {
                                lat = SD_T_READ_READ_OBANK-corrected_overlap;
                                in_between_case++;
                                partial_overlapping++;
                              }
                          }
                        else/*worst case*/
                          {
                            lat = SD_T_READ_READ_OBANK;
                            worst_case++;
                          }

                          // DR keep track of time between misses
                          was_miss = 1;

                        other_bank_read_access_miss[0]++;
                        obr_after_read_miss++;
                      }
                  }
                else/*write*/
                  {
                    if (current_row == active_row[current_bank])/*row is still active*/
                      { /*best_case*/
                        lat = SD_BEST_T_WRITE_WRITE_OBANK;
                        best_case++;
                        other_bank_write_access_hit++;
                        obw_after_write_hit++;
                      }
                    else/*row is not active*/
                      {
                        if (corrected_overlap > 0 )/*overlapping*/
                          {
                            if(corrected_overlap >=SD_T_WRITE_WRITE_OBANK)/*best case*/
                              {
                                lat = SD_BEST_T_WRITE_WRITE_OBANK;
                                best_case++;
                                full_overlapping++;
                              }
                            else/*in between case*/
                              {
                                lat = SD_T_WRITE_WRITE_OBANK-corrected_overlap;
                                in_between_case++;
                                partial_overlapping++;
                              }
                          }
                        else/*worst case*/
                          {
                            lat = SD_T_WRITE_WRITE_OBANK;
                            worst_case++;
                          }

                          // DR keep track of time between misses
                          was_miss = 1;

                        other_bank_write_access_miss[0]++;
                        obw_after_write_miss++;

                      }
                  }
              }
          }
        else /*lastCmdIsRead != cmdIsRead*/
          {
            if (current_bank == last_bank)/*same bank*/
              {
                if (current_row == last_row)/*same row*/
                  {
                        /* Page Hit */
                    if (cmdIsRead)
                      {/*worst case*/
                        lat = SD_T_READ_WRITE_SROW;
                        srow_flag = true;
                        same_row_read_access++;
                        srr_after_write++;
                        worst_case++;
                      }
                    else/*write*/
                      {/*worst case*/
                        lat = SD_T_WRITE_READ_SROW;
                        srow_flag = true;
                        same_row_write_access++;
                        srw_after_read++;
                        worst_case++;
                      }
                  }
                else /*other row in same bank*/
                  {
                        /* Page Miss */
                    if (cmdIsRead)
                      {/*worst case*/
                        lat = SD_T_READ_WRITE_SBANK;
                        same_bank_read_access++;
                        sbr_after_write++;
                        worst_case++;
                      }
                    else/*write*/
                      {
                        if (corrected_overlap > 0 )/*overlapping*/
                          {
                            if (corrected_overlap >= pre_lat)/*best case*/
                              {
                                lat = SD_BEST_T_WRITE_READ_SBANK;
                                best_case++;
                                full_overlapping++;
                              }
                            else/*in between case*/
                              {
                                lat = SD_T_WRITE_READ_SBANK-corrected_overlap;
                                in_between_case++;
                                partial_overlapping++;
                              }
                          }
                        else/*worst case*/
                          {
                            lat = SD_T_WRITE_READ_OBANK;
                            worst_case++;
                          }
                        same_bank_write_access++;
                        sbw_after_read++;
                      }
                  }
              }
            else /*other bank*/
              {
                        /* Page empty */
                if (cmdIsRead)
                  {
                    if (current_row == active_row[current_bank])/*row is still active*/
                      { /*best case*/
                        lat = SD_BEST_T_READ_WRITE_OBANK;
                        best_case++;
                        other_bank_read_access_hit++;
                        obr_after_write_hit++;
                      }
                    else/*row is not active*/
                      {
                        if (corrected_overlap > 0 )/*overlapping*/
                          {
                            if(corrected_overlap >= (pre_lat+act_lat))/*best case*/
                              {
                                lat = SD_BEST_T_READ_WRITE_OBANK;
                                best_case++;
                                full_overlapping++;
                              }
                            else/*in between case*/
                              {
                                lat = SD_T_READ_WRITE_OBANK-corrected_overlap;
                                in_between_case++;
                                partial_overlapping++;
                              }
                          }
                        else/*worst case*/
                          {
                            lat = SD_T_READ_WRITE_OBANK;
                            worst_case++;
                          }
                          // DR keep track of time between misses
                          was_miss = 1;

                        other_bank_read_access_miss[0]++;
                        obr_after_write_miss++;
                      }
                  }
                else/*write*/
                  {
                    if (current_row == active_row[current_bank])/*row is still active*/
                      { /*best case*/
                        lat = SD_BEST_T_WRITE_READ_OBANK;
                        best_case++;
                        other_bank_write_access_hit++;
                        obw_after_read_hit++;
                      }
                    else/*row is not active*/
                      {
                        if (corrected_overlap > 0 )/*overlapping*/
                          {
                            if (corrected_overlap >= (SD_T_WRITE_READ_OBANK-SD_BEST_T_WRITE_READ_OBANK))/*best case*/
                              {/*best case*/
                                lat = SD_BEST_T_WRITE_READ_OBANK;
                                best_case++;
                                full_overlapping++;
                              }
                            else/*in between case*/
                              {
                                lat = SD_T_WRITE_READ_OBANK-corrected_overlap;
                                in_between_case++;
                                partial_overlapping++;
                              }
                          }
                        else/*worst case*/
                          {
                            lat = SD_T_WRITE_READ_OBANK;
                            worst_case++;
                          }

                          // DR keep track of time between misses
                          was_miss = 1;

                        other_bank_write_access_miss[0]++;
                        obw_after_read_miss++;
                      }
                  }
              }
          }
        /*fprintf(stderr,"%4d %4d ",lat,active_row[current_bank]);debugging*/

        lat += chunks; /* burst length added*/
        if(srow_flag == false)
                timing_correction = cpu_ratio*(trc_lat - pre_lat - act_lat - cas_lat - 1);


        /*fprintf(stderr,"%4d ",lat);debugging*/

        active_row[current_bank]=current_row; /* open-page (hit) register */
        lastCmdIsRead = cmdIsRead;
        last_bank = current_bank;
        last_row  = current_row;

        if (cpu_ratio < 1.0)
          {
            lat = (lat+((int)(1/cpu_ratio)-1))/(int)(1/cpu_ratio);
          }
        else
          {
            temp = (int)(lat*cpu_ratio);
            lat = (lat*cpu_ratio == temp)?temp:(temp+1); /*round up*/
          }