OneToAll.hpp

/*
Copyright (c) 2024 Advanced Micro Devices, Inc. All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
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The above copyright notice and this permission notice shall be included in
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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*/

void OneToAllPreset(EnvVars&           ev,
                    size_t      const  numBytesPerTransfer,
                    std::string const  presetName)
{
  int numDetectedGpus = TransferBench::GetNumExecutors(EXE_GPU_GFX);
  if (numDetectedGpus < 2) {
    printf("[ERROR] One-to-all benchmark requires machine with at least 2 GPUs\n");
    exit(1);
  }

  // Collect env vars for this preset
  int         numGpuDevices = EnvVars::GetEnvVar("NUM_GPU_DEVICES", numDetectedGpus);
  int         numSubExecs   = EnvVars::GetEnvVar("NUM_GPU_SE", 4);
  int         exeIndex      = EnvVars::GetEnvVar("EXE_INDEX",   0);
  int         sweepDir      = EnvVars::GetEnvVar("SWEEP_DIR",  0);
  std::string sweepDst      = EnvVars::GetEnvVar("SWEEP_DST",  "G");
  std::string sweepExe      = EnvVars::GetEnvVar("SWEEP_EXE",  "G");
  std::string sweepSrc      = EnvVars::GetEnvVar("SWEEP_SRC",  "G");
  int         sweepMin      = EnvVars::GetEnvVar("SWEEP_MIN",  1);
  int         sweepMax      = EnvVars::GetEnvVar("SWEEP_MAX",  numGpuDevices);

  // Display environment variables
  ev.DisplayEnvVars();
  if (!ev.hideEnv) {
    if (!ev.outputToCsv) printf("[One-To-All Related]\n");
    ev.Print("NUM_GPU_DEVICES", numGpuDevices,    "Using %d GPUs", numGpuDevices);
    ev.Print("NUM_GPU_SE",      numSubExecs,      "Using %d subExecutors/CUs per Transfer", numSubExecs);
    ev.Print("EXE_INDEX",       exeIndex,         "Executing on GPU %d", exeIndex);
    ev.Print("SWEEP_DIR",       sweepDir,         "Direction of transfer");
    ev.Print("SWEEP_DST",       sweepDst.c_str(), "DST memory types to sweep");
    ev.Print("SWEEP_EXE",       sweepExe.c_str(), "Executor type to use");
    ev.Print("SWEEP_MAX",       sweepMax,         "Maximum number of peers");
    ev.Print("SWEEP_MIN",       sweepMin,         "Minimum number of peers");
    ev.Print("SWEEP_SRC",       sweepSrc.c_str(), "SRC memory types to sweep");
    printf("\n");
  }

  // Perform validation
  for (auto ch : sweepExe) {
    if (ch != 'G' && ch != 'D') {
      printf("[ERROR] Unrecognized executor type '%c' specified\n", ch);
      exit(1);
    }
  }

  TransferBench::ConfigOptions cfg = ev.ToConfigOptions();
  TransferBench::TestResults results;

  char const sep = (ev.outputToCsv ? ',' : ' ');

  for (char src : sweepSrc) for (char exe : sweepExe) for (char dst : sweepDst) {
    // Skip invalid configurations
    if ((exe == 'D' && (src == 'N' || dst == 'N')) || (src == 'N' && dst == 'N')) continue;

    printf("Executing (%c%s -> %c%d -> %c%s)\n",
           src, src == 'N' ? "" : (sweepDir == 0 ? std::to_string(exeIndex).c_str() : std::string("*").c_str()),
           exe, exeIndex,
           dst, dst == 'N' ? "" : sweepDir == 0 ? std::string("*").c_str() : std::to_string(exeIndex).c_str());

    for (int i = 0; i < numGpuDevices; i++) {
      if (i == exeIndex) continue;
      printf("   GPU %-3d  %c", i, sep);
    }
    printf("\n");
    if (!ev.outputToCsv) {
      for (int i = 0; i < numGpuDevices-1; i++)
        printf("-------------");
      printf("\n");
    }

    for (int p = sweepMin; p <= sweepMax; p++) {
      for (int bitmask = 0; bitmask < (1<<numGpuDevices); bitmask++) {
        if (bitmask & (1<<exeIndex) || __builtin_popcount(bitmask) != p) continue;

        std::vector<Transfer> transfers;
        for (int i = 0; i < numGpuDevices; i++) {
          if (bitmask & (1<<i)) {
            Transfer t;
            CheckForError(TransferBench::CharToExeType(exe, t.exeDevice.exeType));
            t.exeDevice.exeIndex = exeIndex;
            t.exeSubIndex = -1;
            t.numSubExecs = numSubExecs;
            t.numBytes    = numBytesPerTransfer;

            if (src == 'N') {
              t.srcs.clear();
            } else {
              t.srcs.resize(1);
              CheckForError(TransferBench::CharToMemType(src, t.srcs[0].memType));
              t.srcs[0].memIndex = sweepDir == 0 ? exeIndex : i;
            }

            if (dst == 'N') {
              t.dsts.clear();
            } else {
              t.dsts.resize(1);
              CheckForError(TransferBench::CharToMemType(dst, t.dsts[0].memType));
              t.dsts[0].memIndex = sweepDir == 0 ? i : exeIndex;
            }
            transfers.push_back(t);
          }
        }
        if (!TransferBench::RunTransfers(cfg, transfers, results)) {
          PrintErrors(results.errResults);
          exit(1);
        }

        int counter = 0;
        for (int i = 0; i < numGpuDevices; i++) {
          if (bitmask & (1<<i))
            printf("  %8.3f  %c", results.tfrResults[counter++].avgBandwidthGbPerSec, sep);
          else if (i != exeIndex)
            printf("            %c", sep);
        }

        printf(" %d %d", p, numSubExecs);
        for (auto i = 0; i < transfers.size(); i++) {
          printf(" (%s %c%d %s)",
                 MemDevicesToStr(transfers[i].srcs).c_str(),
                 ExeTypeStr[transfers[i].exeDevice.exeType], transfers[i].exeDevice.exeIndex,
                 MemDevicesToStr(transfers[i].dsts).c_str());
        }
        printf("\n");
      }
    }
  }
}