News from GPU parameter tuning

Still fighting with the launch bound fix:

• Need to update dumpGPUDefParam:
  
  
  void dumpGPUDefParam(const char* outputfile = "parameters.out")

  {

  auto param = o2::gpu::internal::GPUDefParametersLoad();

  printf("Loaded params:\n%s\nWriting them to %s\n", o2::gpu::internal::GPUDefParametersExport(param, false).c_str(), outputfile);

  FILE* fp = fopen(outputfile, "w+b");

  fwrite(&param, 1, sizeof(param), fp);

  fclose(fp);

  }
  
  Proposed solution: define WARP size in the header file and add minBlockFactor to the call to GPUDefParametersExport and dump that export somehow
  
  
• RTC fails with @David's patch:
   29797 | extern "C" {__attribute__((global)) void GPUCA_KRNL_REG_DEFAULT((GPUCA_LB_GPUTPCNeighboursFinder)) krnl_GPUTPCNeighboursFinder( int32_t _iSector_internal ) { __attribute__((shared)) typename GPUTPCNeighboursFinder::GPUSharedMemory smem; GPUTPCNeighboursFinder::template Thread<GPUTPCNeighboursFinder::defaultKernel>((gridDim.x), (blockDim.x), (blockIdx.x), (threadIdx.x), smem, GPUTPCNeighboursFinder::Processor((gGPUConstantMemBuffer.v))[_iSector_internal] ); }}
  
  Fails to expand the macro, suspect that it is not defined there, I am investigating

ALICE contribution to HS23

• Completed build.sh . To build, just run 
  docker run -v /cvmfs:/cvmfs alice_gpu_hs23 --backend HIP --arch gfx908
• Need to test build for multiple archs
• Warnings:
  

  CMake Warning (dev) at /opt/rocm/lib/cmake/hip/hip-config-amd.cmake:91 (message):
   AMDGPU_TARGETS was not set, and system GPU detection was unsuccsesful.

     The amdgpu-arch tool failed:
   Error: 'Failed to get device count'
   Output: ''

     As a result, --offload-arch will not be set for subsuqent
   compilations, and the default architecture
   (gfx906 for dynamic build / gfx942 for static build) will be used

Call Stack (most recent call first):
  /opt/rocm/lib/cmake/hip/hip-config.cmake:149 (include)
  /alice_hs23/O2/dependencies/FindO2GPU.cmake:258 (find_package)
  CMakeLists.txt:130 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

  But then:
  
  -- Building GPUTracking with HIP support (GPU Target gfx908)
-- Using optimized HIP settings for MI100 GPU
  
  And in the actual compilation commands appears --offload-arch=gfx908
  
  

• First draft of run.sh will use dataset within the container
• When Robin is back from vacation, we will test on their machines