GPUKernelSizeOptimizerSvc.h

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//
// Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
//
// Dear emacs, this is -*- c++ -*-
//
 
#ifndef CALORECGPU_GPUKERNELSIZEOPTIMIZERSVC_H
#define CALORECGPU_GPUKERNELSIZEOPTIMIZERSVC_H
 
#include <string>
#include <vector>
#include <unordered_map>
#include <cstdint>
 
#include "AthenaBaseComps/AthService.h"
 
#include "CaloRecGPU/IGPUKernelSizeOptimizerSvc.h"
#include "CaloRecGPU/CaloGPUCUDAInitialization.h"
 
#include <nlohmann/json.hpp>
 
class GPUKernelSizeOptimizerSvc : public extends <AthService, IGPUKernelSizeOptimizerSvc>, public CaloGPUCUDAInitialization
{
 public:
 
  GPUKernelSizeOptimizerSvc(const std::string & name, ISvcLocator * svc);
 
  virtual void register_kernels(const std::string & tool_name,
                                const int number,
                                void ** kernels,
                                const int * blocksize_hints,
                                const int * gridsize_hints,
                                const int * max_total_threads,
                                const int offset = 0) override;
 
  virtual CUDAKernelLaunchConfiguration get_launch_configuration(const std::string & name,
                                                                 const int number = 0,
                                                                 const int dynamic_memory = 0) const override;
 
  virtual bool can_use_cooperative_groups() const override
  {
    return m_coopgroup_support;
  }
 
  virtual bool can_use_dynamic_parallelism() const override
  {
    return m_dynpar_support;
  }
 
  virtual bool should_use_minimal_kernel_sizes() const
  {
    //Testing shows that, at least on the devices we use,
    //we only lose performance by dyn-par'ing our way to do this.
    return false;
  }
 
  virtual StatusCode initialize() override
  {
    return CaloGPUCUDAInitialization::initialize();
  }
  
  virtual StatusCode initialize_CUDA() override;
  
  virtual StatusCode finalize() override;
  
 private:
 
  bool m_dynpar_support = false;
  bool m_coopgroup_support = false;
 
  struct KernelRecord
  {
    CUDAKernelLaunchConfiguration configs[101];
    void add_configuration(const CUDAKernelLaunchConfiguration & config,
                           const int usage_start = 0,
                           const int usage_end = 100,
                           const bool overwrite = false)
    {
      for (int u = usage_start; u <= usage_end && u <= 100; ++u)
        {
          CUDAKernelLaunchConfiguration & cfg = configs[u];
          if (overwrite || cfg.grid_x <= 0)
            {
              cfg = config;
            }
        }
    }
  };
 
  std::unordered_map<std::string, std::vector<KernelRecord>> m_kernel_map;
 
  int get_GPU_usage() const
  {
    return 0;
  }
 
  Gaudi::Property<std::vector<std::string>> m_kernelFiles {this, "KernelSizeInput", {}, "Kernel size input JSON files"};
 
  Gaudi::Property<bool> m_outputSizes {this, "OutputSizes", true, "Write out last used kernel sizes"};
 
  Gaudi::Property<std::string> m_outputFile {this, "OutputFile", "sizes.json", "Kernel size output file"};
 
  struct KernelsEntry
  {
    struct KernelInfo
    {
      int usage_start = 0;
      int usage_end = 100;
      int grid_x = 0, grid_y = 0, grid_z = 0, block_x = 0, block_y = 0, block_z = 0;
 
      NLOHMANN_DEFINE_TYPE_INTRUSIVE(KernelInfo, usage_start, usage_end,
                                     grid_x, grid_y, grid_z,
                                     block_x, block_y, block_z)
    };
 
    std::string device;
    std::string name;
    std::vector< std::vector<KernelInfo> > kernels;
 
    
    NLOHMANN_DEFINE_TYPE_INTRUSIVE(KernelsEntry, device, name, kernels)
  };
 
};
 
#endif