Scaling.hpp

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*/

void ScalingPreset(EnvVars&           ev,
                   size_t      const  numBytesPerTransfer,
                   std::string const  presetName)
{
  int numDetectedCpus = TransferBench::GetNumExecutors(EXE_CPU);
  int numDetectedGpus = TransferBench::GetNumExecutors(EXE_GPU_GFX);

  // Collect env vars for this preset
  int localIdx      = EnvVars::GetEnvVar("LOCAL_IDX",       0);
  int numCpuDevices = EnvVars::GetEnvVar("NUM_CPU_DEVICES", numDetectedCpus);
  int numGpuDevices = EnvVars::GetEnvVar("NUM_GPU_DEVICES", numDetectedGpus);
  int sweepMax      = EnvVars::GetEnvVar("SWEEP_MAX",       32);
  int sweepMin      = EnvVars::GetEnvVar("SWEEP_MIN",       1);
  int useFineGrain  = EnvVars::GetEnvVar("USE_FINE_GRAIN",  0);

  // Display environment variables
  ev.DisplayEnvVars();
  if (!ev.hideEnv) {
    int outputToCsv = ev.outputToCsv;
    if (!outputToCsv) printf("[Schmoo Related]\n");
    ev.Print("LOCAL_IDX",      localIdx,     "Local GPU index");
    ev.Print("SWEEP_MAX",      sweepMax,     "Max number of subExecutors to use");
    ev.Print("SWEEP_MIN",      sweepMin,     "Min number of subExecutors to use");
    printf("\n");
  }

  // Validate env vars
  if (localIdx >= numDetectedGpus) {
    printf("[ERROR] Cannot execute scaling test with local GPU device %d\n", localIdx);
    exit(1);
  }

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

  char separator = (ev.outputToCsv ? ',' : ' ');
  int numDevices = numCpuDevices + numGpuDevices;

  printf("GPU-GFX Scaling benchmark:\n");
  printf("==========================\n");
  printf("- Copying %lu bytes from GPU %d to other devices\n", numBytesPerTransfer, localIdx);
  printf("- All numbers reported as GB/sec\n\n");
  printf("NumCUs");
  for (int i = 0; i < numDevices; i++)
    printf("%c  %s%02d     ", separator, i < numCpuDevices ? "CPU" : "GPU", i < numCpuDevices ? i : i - numCpuDevices);
  printf("\n");

  std::vector<std::pair<double, int>> bestResult(numDevices);

  std::vector<Transfer> transfers(1);
  Transfer& t   = transfers[0];
  t.exeDevice   = {EXE_GPU_GFX, localIdx};
  t.exeSubIndex = -1;
  t.numBytes    = numBytesPerTransfer;
  t.srcs        = {{MEM_GPU, localIdx}};

  for (int numSubExec = sweepMin; numSubExec <= sweepMax; numSubExec++) {
    t.numSubExecs = numSubExec;
    printf("%4d  ", numSubExec);

    for (int i = 0; i < numDevices; i++) {
      t.dsts = {{i < numCpuDevices ? MEM_CPU : MEM_GPU,
                 i < numCpuDevices ? i : i - numCpuDevices}};
      if (!RunTransfers(cfg, transfers, results)) {
        PrintErrors(results.errResults);
        exit(1);
      }
      double bw = results.tfrResults[0].avgBandwidthGbPerSec;
      printf("%c%7.2f     ", separator, bw);

      if (bw > bestResult[i].first) {
        bestResult[i].first  = bw;
        bestResult[i].second = numSubExec;
      }
    }
    printf("\n");
  }

  printf(" Best ");
  for (int i = 0; i < numDevices; i++)
    printf("%c%7.2f(%3d)", separator, bestResult[i].first, bestResult[i].second);
  printf("\n");
}