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*/

int AllToAllPreset(EnvVars&           ev,
                    size_t      const  numBytesPerTransfer,
                    std::string const  presetName)
{
  enum
  {
    A2A_COPY       = 0,
    A2A_READ_ONLY  = 1,
    A2A_WRITE_ONLY = 2,
    A2A_CUSTOM     = 3,
  };
  char a2aModeStr[4][20] = {"Copy", "Read-Only", "Write-Only", "Custom"};

  // Force single-stream mode for all-to-all benchmark
  ev.useSingleStream = 1;

  // Force to gfx unroll 2 unless explicitly set
  ev.gfxUnroll      = EnvVars::GetEnvVar("GFX_UNROLL", 2);

  int numRanks = TransferBench::GetNumRanks();
  int numDetectedGpus = TransferBench::GetNumExecutors(EXE_GPU_GFX);

  // Collect env vars for this preset
  int a2aDirect     = EnvVars::GetEnvVar("A2A_DIRECT"     , 1);
  int a2aLocal      = EnvVars::GetEnvVar("A2A_LOCAL"      , 0);
  int memTypeIdx    = EnvVars::GetEnvVar("MEM_TYPE"       , 2);
  int numGpus       = EnvVars::GetEnvVar("NUM_GPU_DEVICES", numDetectedGpus);
  int numQueuePairs = EnvVars::GetEnvVar("NUM_QUEUE_PAIRS", 0);
  int numResults    = EnvVars::GetEnvVar("NUM_RESULTS"    , numRanks > 1 ? 1 : 0);
  int numSubExecs   = EnvVars::GetEnvVar("NUM_SUB_EXEC"   , 8);
  int showDetails   = EnvVars::GetEnvVar("SHOW_DETAILS"   , 0);
  int useDmaExec    = EnvVars::GetEnvVar("USE_DMA_EXEC"   , 0);
  int useFineGrain  = EnvVars::GetEnvVar("USE_FINE_GRAIN" , -999); // Deprecated
  int useRemoteRead = EnvVars::GetEnvVar("USE_REMOTE_READ", 0);

  // Check that all ranks have at least the number of GPUs requested
  // Warn if NIC configuration is slightly different from one another
  int numNics  = TransferBench::GetNumExecutors(EXE_NIC, 0);
  bool nicDifference = false;
  for (int rank = 0; rank < numRanks; rank++) {
    if (numGpus > TransferBench::GetNumExecutors(EXE_GPU_GFX, rank)) {
      Utils::Print("[ERROR] All-to-All preset requires each rank to have the same number of GPUs\n");
      return 1;
    }
    if (numQueuePairs > 0 && numNics != TransferBench::GetNumExecutors(EXE_NIC, rank))
      nicDifference = true;
  }
  if (nicDifference)
    Utils::Print("[WARN] Not all ranks have the same number of NICs\n");

  // A2A_MODE may be 0,1,2 or else custom numSrcs:numDsts
  int numSrcs, numDsts;
  int a2aMode = 0;
  if (getenv("A2A_MODE") && sscanf(getenv("A2A_MODE"), "%d:%d", &numSrcs, &numDsts) == 2) {
    a2aMode = A2A_CUSTOM;
  } else {
    a2aMode = EnvVars::GetEnvVar("A2A_MODE", 0);
    if (a2aMode < 0 || a2aMode > 2) {
      Utils::Print("[ERROR] a2aMode must be between 0 and 2, or else numSrcs:numDsts\n");
      return 1;
    }
    numSrcs = (a2aMode == A2A_WRITE_ONLY ? 0 : 1);
    numDsts = (a2aMode == A2A_READ_ONLY  ? 0 : 1);
  }

  // Deprecated env var check
  if (useFineGrain != -999) {
    memTypeIdx = useFineGrain ? 2 : 0;
  }

  MemType memType = Utils::GetGpuMemType(memTypeIdx);
  std::string devMemTypeStr = Utils::GetGpuMemTypeStr(memTypeIdx);

  // Print off environment variables
  if (Utils::RankDoesOutput()) {
    ev.DisplayEnvVars();
    if (!ev.hideEnv) {
      if (!ev.outputToCsv) printf("[AllToAll Related]\n");
      ev.Print("A2A_DIRECT"     , a2aDirect    , a2aDirect ? "Only using direct links" : "Full all-to-all");
      ev.Print("A2A_LOCAL"      , a2aLocal     , "%s local transfers", a2aLocal ? "Include" : "Exclude");
      ev.Print("A2A_MODE"       , (a2aMode == A2A_CUSTOM) ?  std::to_string(numSrcs) + ":" + std::to_string(numDsts) : std::to_string(a2aMode),
                                  (a2aMode == A2A_CUSTOM) ? (std::to_string(numSrcs) + " read(s) " +
                                                             std::to_string(numDsts) + " write(s)").c_str(): a2aModeStr[a2aMode]);
      ev.Print("MEM_TYPE"       , memTypeIdx   , "Using %s GPU memory (%s)", devMemTypeStr.c_str(), Utils::GetAllGpuMemTypeStr().c_str());
      ev.Print("NUM_GPU_DEVICES", numGpus      , "Using %d GPUs", numGpus);
      ev.Print("NUM_QUEUE_PAIRS", numQueuePairs, "Using %d queue pairs for NIC transfers", numQueuePairs);
      if (numRanks > 1)
        ev.Print("NUM_RESULTS"  , numResults   , "Showing top/bottom %d results", numResults);
      ev.Print("NUM_SUB_EXEC"   , numSubExecs  , "Using %d subexecutors/CUs per Transfer", numSubExecs);
      ev.Print("SHOW_DETAILS"   , showDetails  , "%s full Test details", showDetails ? "Showing" : "Hiding");
      ev.Print("USE_DMA_EXEC"   , useDmaExec   , "Using %s executor", useDmaExec ? "DMA" : "GFX");
      ev.Print("USE_REMOTE_READ", useRemoteRead, "Using %s as executor", useRemoteRead ? "DST" : "SRC");
      printf("\n");
    }
  }
  // Validate env vars
  if (numGpus < 0 || numGpus > numDetectedGpus) {
    Utils::Print("[ERROR] Cannot use %d GPUs.  Detected %d GPUs\n", numGpus, numDetectedGpus);
    return 1;
  }
  if (useDmaExec && (numSrcs != 1 || numDsts != 1)) {
    Utils::Print("[ERROR] DMA execution can only be used for copies (A2A_MODE=0)\n");
    return 1;
  }
  if (numResults * 2 > numRanks) {
    Utils::Print("[ERROR] Number of extrema results requested exceeds number of ranks.  NUM_RESULTS should be at most half the number of ranks\n");
    return 1;
  }

  // Collect the number of GPU devices to use
  ExeType exeType = useDmaExec ? EXE_GPU_DMA : EXE_GPU_GFX;

  std::vector<std::map<std::pair<int, int>, int>> reIndex(numRanks);
  std::vector<Transfer> transfers;
  for (int r = 0; r < numRanks; r++) {
    for (int i = 0; i < numGpus; i++) {
      for (int j = 0; j < numGpus; j++) {

        // Check whether or not to execute this pair
        // On older MI2XX hardware all-to-all isn't ideal because not all GPUs are directly connected via XGMI
        // This executes only
        if (i == j) {
          if (!a2aLocal) continue;
        } else if (a2aDirect) {
#if !defined(__NVCC__)
          uint32_t linkType, hopCount;
          HIP_CALL(hipExtGetLinkTypeAndHopCount(i, j, &linkType, &hopCount));
          if (hopCount != 1) continue;
#endif
        }

        // Build Transfer and add it to list
        TransferBench::Transfer transfer;
        transfer.numBytes = numBytesPerTransfer;
        for (int x = 0; x < numSrcs; x++) transfer.srcs.push_back({memType, i, r});

        // When using multiple destinations, the additional destinations are "local"
        if (numDsts) transfer.dsts.push_back({memType, j, r});
        for (int x = 1; x < numDsts; x++) transfer.dsts.push_back({memType, i, r});
        transfer.exeDevice = {exeType, (useRemoteRead ? j : i), r};
        transfer.exeSubIndex = -1;
        transfer.numSubExecs = numSubExecs;

        reIndex[r][std::make_pair(i,j)] = transfers.size();
        transfers.push_back(transfer);
      }
    }
  }

  // Create rings using NICs
  std::vector<std::vector<int>> nicTransferIdx(numRanks, std::vector<int>(numGpus));
  if (numQueuePairs > 0) {
    for (int r = 0; r < numRanks; r++) {
      for (int i = 0; i < numGpus; i++) {
        TransferBench::Transfer transfer;
        transfer.numBytes = numBytesPerTransfer;
        transfer.srcs.push_back({memType, i, r});
        transfer.dsts.push_back({memType, (i+1) % numGpus, r});
        transfer.exeDevice = {TransferBench::EXE_NIC_NEAREST, i, r};
        transfer.exeSubIndex = (i+1) % numGpus;
        transfer.numSubExecs = numQueuePairs;
        nicTransferIdx[r][i] = transfers.size();
        transfers.push_back(transfer);
      }
    }
  }

  Utils::Print("GPU-%s All-To-All benchmark:\n", useDmaExec ? "DMA" : "GFX");
  Utils::Print("==============================\n");
  Utils::Print("[%lu bytes per Transfer] [%s:%d] [%d Read(s) %d Write(s)] [MemType:%s] [NIC QueuePairs:%d] [#Ranks:%d]\n",
               numBytesPerTransfer, useDmaExec ? "DMA" : "GFX", numSubExecs, numSrcs, numDsts,
               devMemTypeStr.c_str(), numQueuePairs, numRanks);

  // Execute Transfers
  TransferBench::ConfigOptions cfg = ev.ToConfigOptions();
  TransferBench::TestResults results;
  if (!TransferBench::RunTransfers(cfg, transfers, results)) {
    for (auto const& err : results.errResults)
      Utils::Print("%s\n", err.errMsg.c_str());
    return 1;
  } else if (showDetails) {
    Utils::PrintResults(ev, 1, transfers, results);
    Utils::Print("\n");
  }

  // Only ranks that actually do output will compile results
  if (!Utils::RankDoesOutput()) return 0;

  // Prepare table of results
  int numRows   = 2 + (numGpus + 1) * (1 + 2*numResults);
  int numCols   = 1 + (numGpus + (numQueuePairs > 1 ? 1 : 0) + 2) * (numResults > 0 ? 2 : 1);
  int precision = 2;
  Utils::TableHelper table(numRows, numCols, precision);

  // Header row
  int rowIdx = 0, colIdx = 0;
  table.DrawRowBorder(rowIdx);
  table.DrawColBorder(colIdx);
  table.Set(rowIdx, colIdx++, " SRC\\DST ");
  for (int gpuIdx = 0; gpuIdx < numGpus; gpuIdx++) {
    if (numResults > 0 || gpuIdx == 0) {
      table.DrawColBorder(colIdx);
    }
    table.Set(rowIdx, colIdx++, " GPU %02d ", gpuIdx);
    if (numResults > 0) {
      table.SetColAlignment(colIdx, Utils::TableHelper::ALIGN_CENTER);
      table.Set(rowIdx, colIdx++, "(Rnk)");
    }
  }
  table.DrawColBorder(colIdx);

  if (numQueuePairs > 0) {
    table.Set(rowIdx, colIdx++, " NIC ", numQueuePairs);
    if (numResults > 0) {
      table.SetColAlignment(colIdx, Utils::TableHelper::ALIGN_CENTER);
      table.Set(rowIdx, colIdx++, "(Rnk)");
    }
    table.DrawColBorder(colIdx);
  }

  table.Set(rowIdx, colIdx++, " STotal ");
  if (numResults > 0) {
    table.SetColAlignment(colIdx, Utils::TableHelper::ALIGN_CENTER);
    table.Set(rowIdx, colIdx++, "(Rnk)");
  }
  table.DrawColBorder(colIdx);

  table.Set(rowIdx, colIdx++, " Actual ");
  if (numResults > 0) {
    table.SetColAlignment(colIdx, Utils::TableHelper::ALIGN_CENTER);
    table.Set(rowIdx, colIdx++, "(Rnk)");
  }
  table.DrawColBorder(colIdx);
  rowIdx++;
  table.DrawRowBorder(rowIdx);

  // Header column
  for (int gpuIdx = 0; gpuIdx < numGpus; gpuIdx++) {
    // MAX results
    for (int i = 0; i < numResults; i++) {
      if (i == 0) table.Set(rowIdx, 0, " GPU %02d MAX ", gpuIdx);
      rowIdx++;
    }
    // Avg result
    table.Set(rowIdx++, 0, " GPU %02d%s ", gpuIdx, numResults > 0 ? " AVG" : "");
    // MIN results
    for (int i = numResults-1; i >= 0; i--) {
      if (i == 0) table.Set(rowIdx, 0, " GPU %02d MIN ", gpuIdx);
      rowIdx++;
    }
    if (numResults > 0 || gpuIdx == numGpus - 1) table.DrawRowBorder(rowIdx);
  }

  // RTotal
  for (int i = 0; i < numResults; i++) {
    if (i == 0) table.Set(rowIdx, 0, " RTotal MAX ");
    rowIdx++;
  }
  // Avg result
  table.Set(rowIdx++, 0, " RTotal%s ", numResults > 0 ? " AVG" : "");
  // MIN results
  for (int i = numResults-1; i >= 0; i--) {
    if (i == 0) table.Set(rowIdx, 0, " RTotal MIN ");
    rowIdx++;
  }
  table.DrawRowBorder(rowIdx);

  // Data cells
  std::vector<std::vector<double>> rowTotalBandwidth(numRanks, std::vector<double>(numGpus, 0.0));
  std::vector<std::vector<double>> colTotalBandwidth(numRanks, std::vector<double>(numGpus+3, 0.0));
  double totalBandwidthGpu = 0.0;

  for (int src = 0; src < numGpus; src++) {
    int rowBase = 1 + src * (2*numResults+1);

    std::vector<double> minBw(numRanks, std::numeric_limits<double>::max());
    int rowTransferCount = 0;

    for (int dst = 0; dst < numGpus; dst++) {
      int colBase = 1 + dst * (numResults ? 2 : 1);

      // Collect results for all ranks
      std::vector<std::pair<double, int>> bws;
      double average = 0.0;
      for (int rank = 0; rank < numRanks; rank++) {
        if (reIndex[rank].count(std::make_pair(src, dst))) {
          int const transferIdx = reIndex[rank][std::make_pair(src,dst)];
          double avgBw = results.tfrResults[transferIdx].avgBandwidthGbPerSec;
          average                      += avgBw;
          totalBandwidthGpu            += avgBw;
          rowTotalBandwidth[rank][src] += avgBw;
          colTotalBandwidth[rank][dst] += avgBw;
          minBw[rank] = std::min(minBw[rank], avgBw);
          bws.push_back(std::make_pair(avgBw, rank));
        }
      }
      if (bws.size() == 0) {
        table.Set(rowBase + numResults, colBase, " N/A ");
      } else {
        std::sort(bws.begin(), bws.end());
        average /= bws.size();
        rowTransferCount++;

        // MAX results
        for (int i = 0; i < numResults; i++) {
          table.Set(rowBase + i, colBase  , " %.2f ", bws[bws.size()-1-i].first);
          table.Set(rowBase + i, colBase+1, "%d ", bws[bws.size()-1-i].second);
        }

        // AVG results
        table.Set(rowBase + numResults, colBase, " %.2f ", average);

        // MIN results
        for (int i = 0; i < numResults; i++) {
          table.Set(rowBase + numResults + 1 + i, colBase   , " %.2f ", bws[numResults-1-i].first);
          table.Set(rowBase + numResults + 1 + i, colBase+1 , "%d ", bws[numResults-1-i].second);
        }
      }
    }

    // NIC results
    int colTotIdx = numGpus;
    if (numQueuePairs > 0) {
      int colBase = 1 + numGpus * (numResults ? 2 : 1);
      std::vector<std::pair<double, int>> bws;
      double average = 0.0;

      for (int rank = 0; rank < numRanks; rank++) {
        double avgBw = results.tfrResults[nicTransferIdx[rank][src]].avgBandwidthGbPerSec;
        average                            += avgBw;
        totalBandwidthGpu                  += avgBw;
        rowTotalBandwidth[rank][src]       += avgBw;
        colTotalBandwidth[rank][colTotIdx] += avgBw;
        minBw[rank] = std::min(minBw[rank], avgBw);
        bws.push_back(std::make_pair(avgBw, rank));
      }
      colTotIdx++;
      std::sort(bws.begin(), bws.end());
      average /= bws.size();
      rowTransferCount++;

      // MAX results
      for (int i = 0; i < numResults; i++) {
        table.Set(rowBase + i, colBase  , " %.2f ", bws[bws.size()-1-i].first);
        table.Set(rowBase + i, colBase+1,  "%d ", bws[bws.size()-1-i].second);
      }

      // AVG results
      table.Set(rowBase + numResults, colBase, " %.2f ", average);

      // MIN results
      for (int i = 0; i < numResults; i++) {
        table.Set(rowBase + numResults + 1 + i, colBase   , " %.2f ", bws[numResults-1-i].first);
        table.Set(rowBase + numResults + 1 + i, colBase+1 , "%d ", bws[numResults-1-i].second);
      }
    }

    // STotal
    {
      int colBase = 1 + (numGpus + (numQueuePairs ? 1 : 0)) * (numResults ? 2 : 1);
      std::vector<std::pair<double, int>> bws;
      double average = 0.0;
      for (int rank = 0; rank < numRanks; rank++) {
        double avgBw = rowTotalBandwidth[rank][src];
        bws.push_back(std::make_pair(avgBw, rank));
        colTotalBandwidth[rank][colTotIdx] += avgBw;
        average += avgBw;
      }
      colTotIdx++;
      std::sort(bws.begin(), bws.end());
      average /= bws.size();

      // MAX results
      for (int i = 0; i < numResults; i++) {
        table.Set(rowBase + i, colBase  , " %.2f ", bws[bws.size()-1-i].first);
        table.Set(rowBase + i, colBase+1, "%d ", bws[bws.size()-1-i].second);
      }

      // AVG results
      table.Set(rowBase + numResults, colBase, " %.2f ", average);

      // MIN results
      for (int i = 0; i < numResults; i++) {
        table.Set(rowBase + numResults + 1 + i, colBase   , " %.2f ", bws[numResults-1-i].first);
        table.Set(rowBase + numResults + 1 + i, colBase+1 , "%d ", bws[numResults-1-i].second);
      }
    }

    // Actual
    {
      int colBase = 1 + (numGpus + (numQueuePairs ? 1 : 0) + 1) * (numResults ? 2 : 1);
      std::vector<std::pair<double, int>> bws;
      double average = 0.0;
      for (int rank = 0; rank < numRanks; rank++) {
        double avgBw = rowTransferCount * minBw[rank];
        bws.push_back(std::make_pair(avgBw, rank));
        average += avgBw;
        colTotalBandwidth[rank][colTotIdx] += avgBw;
      }
      colTotIdx++;
      std::sort(bws.begin(), bws.end());
      average /= bws.size();

      // MAX results
      for (int i = 0; i < numResults; i++) {
        table.Set(rowBase + i, colBase  , " %.2f ", bws[bws.size()-1-i].first);
        table.Set(rowBase + i, colBase+1, "%d ", bws[bws.size()-1-i].second);
      }

      // AVG results
      table.Set(rowBase + numResults, colBase, " %.2f ", average);

      // MIN results
      for (int i = 0; i < numResults; i++) {
        table.Set(rowBase + numResults + 1 + i, colBase   , " %.2f ", bws[numResults-1-i].first);
        table.Set(rowBase + numResults + 1 + i, colBase+1 , "%d ", bws[numResults-1-i].second);
      }
    }
  }

  // RTotal
  int rowBase = 1 + (numGpus * (1 + 2 * numResults));
  for (int col = 0; col < (numGpus + (numQueuePairs ? 1 : 0) + 2); col++) {
    int colBase = 1 + col * (numResults ? 2 : 1);
    std::vector<std::pair<double, int>> bws;
    double average = 0.0;
    for (int rank = 0; rank < numRanks; rank++) {
      double avgBw = colTotalBandwidth[rank][col];
      bws.push_back(std::make_pair(avgBw, rank));
      average += avgBw;
    }
    std::sort(bws.begin(), bws.end());
    average /= bws.size();

    // MAX results
    for (int i = 0; i < numResults; i++) {
      table.Set(rowBase + i, colBase  , " %.2f ", bws[bws.size()-1-i].first);
      table.Set(rowBase + i, colBase+1, "%d ", bws[bws.size()-1-i].second);
    }

    // AVG results
    table.Set(rowBase + numResults, colBase, " %.2f ", average);

    // MIN results
    for (int i = 0; i < numResults; i++) {
      table.Set(rowBase + numResults + 1 + i, colBase   , " %.2f ", bws[numResults-1-i].first);
      table.Set(rowBase + numResults + 1 + i, colBase+1 , "%d ", bws[numResults-1-i].second);
    }
  }

  // Add CPU results
  table.Set(numRows - 1, numCols - 2, " CPU Timed: ");
  table.Set(numRows - 1, numCols - 1, " %.2f ", results.avgTotalBandwidthGbPerSec);
  for (int col = 0; col < numCols - 2; col++)
    table.SetCellBorder(numRows - 1, col, Utils::TableHelper::BORDER_TOP);
  table.SetCellBorder(numRows - 1, numCols - 2, Utils::TableHelper::BORDER_ALL);
  table.SetCellBorder(numRows - 1, numCols - 1, Utils::TableHelper::BORDER_ALL);

  table.PrintTable(ev.outputToCsv, ev.showBorders);
  Utils::Print("\n");
  Utils::Print("Average   bandwidth (GPU Timed): %8.3f GB/s\n", totalBandwidthGpu / transfers.size());
  Utils::Print("Aggregate bandwidth (GPU Timed): %8.3f GB/s\n", totalBandwidthGpu);
  Utils::Print("Aggregate bandwidth (CPU Timed): %8.3f GB/s\n", results.avgTotalBandwidthGbPerSec);
  Utils::PrintErrors(results.errResults);

  if (Utils::HasDuplicateHostname()) {
    printf("[WARN] It is recommended to run TransferBench with one rank per host to avoid potential aliasing of executors\n");
  }

  if (useFineGrain != -999) {
    Utils::Print("[WARN] USE_FINE_GRAIN has been deprecated and replaced by MEM_TYPE\n");
    Utils::Print("[WARN] MEM_TYPE has been set to %d to correspond to previous use of USE_FINE_GRAIN=%d\n", memTypeIdx, useFineGrain);
  }

  return 0;
}