Constants.h

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
#ifndef TRACKINGITSU_INCLUDE_CONSTANTS_H_
#define TRACKINGITSU_INCLUDE_CONSTANTS_H_
 
#include <array>
#include <utility>
 
namespace o2::its::constants
{
 
constexpr float KB = 1024.f;
constexpr float MB = KB * KB;
constexpr float GB = MB * KB;
constexpr bool DoTimeBenchmarks = true;
constexpr bool SaveTimeBenchmarks = false;
constexpr float Tolerance = 1e-12;                      // numerical tolerance
constexpr int ClustersPerCell = 3;                      // number of clusters for a cell
constexpr int UnusedIndex = -1;                         // global unused flag
constexpr float UnsetValue = -999.f;                    // global unset value
constexpr float Radl = 9.36f;                           // Radiation length of Si [cm]
constexpr float Rho = 2.33f;                            // Density of Si [g/cm^3]
constexpr int MaxIter = 4;                              // Max. supported iterations
constexpr int MaxSelectedTrackletsPerCluster = 100;     // vertexer: max lines per cluster
constexpr int NumberOfConcurrentSeeds = 16;             // default split per worker for the final track fit/extraploation step
constexpr int MinNumberOfConcurrentSeeds = (1 << 8);    // minimum chunk size for a worker for the final track fit/extraploation step
constexpr int MaxNumberOfConcurrentSeeds = (1 << 12);   // maximum chunk size for a worker for the final track fit/extraploation step
constexpr float MaxTrackSeedQ2Pt = 1.e3f;               // maximum q/pt for track seeds
constexpr int GPUBlocks = 60;                           // default CUDA/HIP launch blocks
constexpr int GPUThreads = 256;                         // default CUDA/HIP launch threads
constexpr int GPUThreadsTotal = GPUBlocks * GPUThreads; // default CUDA/HIP total launched threads
 
namespace helpers
{
 
// initialize a std::array at compile time fully with T
template <typename T, std::size_t N, T Value>
constexpr std::array<T, N> initArray()
{
  return []<std::size_t... Is>(std::index_sequence<Is...>) { return std::array<T, N>{(static_cast<void>(Is), Value)...}; }(std::make_index_sequence<N>{});
}
 
} // namespace helpers
} // namespace o2::its::constants
 
#endif /* TRACKINGITSU_INCLUDE_CONSTANTS_H_ */