gpuUtils.cu

Go to the documentation of this file.

// MaCh3 includes
#include "Manager/gpuUtils.cuh"
 
// **************************************************
// Check for a safe call on GPU
void __cudaSafeCall( cudaError err, const char *file, const int line ) {
// **************************************************
#ifdef CUDA_ERROR_CHECK
  if (cudaSuccess != err) {
    fprintf(stderr, "%s failed at %s:%i : %s\n", __func__, file, line, cudaGetErrorString(err));
    throw;
  }
#endif
}
 
// **************************************************
// Check if there's been an error
void __cudaCheckError( const char *file, const int line ) {
// **************************************************
#ifdef CUDA_ERROR_CHECK
  cudaError err = cudaGetLastError();
  if (cudaSuccess != err) {
    fprintf(stderr, "%s failed at %s:%i : %s\n", __func__, file, line, cudaGetErrorString(err));
    throw;
  }
 
  // More careful checking. However, this will affect performance.
  // Comment away if needed.
  err = cudaDeviceSynchronize();
  if (cudaSuccess != err) {
    fprintf(stderr, "%s with sync failed at %s:%i : %s\n", __func__, file, line, cudaGetErrorString(err));
    throw;
  }
#endif
}
 
// *******************************************
//              Utils
// *******************************************
 
// *******************************************
// KS: Get some fancy info about VRAM usage
void checkGpuMem() {
// *******************************************
  float free_m, total_m,used_m;
  size_t free_t, total_t;
 
  cudaMemGetInfo(&free_t, &total_t);
  CudaCheckError();
 
  free_m = static_cast<uint>(free_t)/1048576.0;
  total_m = static_cast<uint>(total_t)/1048576.0;
  used_m = total_m - free_m;
 
  printf("  Memory free %f MB, total memory %f MB, memory used %f MB\n", free_m, total_m, used_m);
}
 
// *******************************************
// KS: Get some fancy info about GPU
void PrintNdevices() {
// *******************************************
  int nDevices;
  cudaGetDeviceCount(&nDevices);
  CudaCheckError();
 
  if (nDevices == 0) {
    printf("No CUDA devices found");
    throw;
  }
 
  printf("  Found %i GPUs, currently I only support one GPU\n", nDevices);
}
 
 
// *******************************************
// KS: Completely clean GPU, this is time consuming and may lead to unexpected behaviour.
void ResetDevice() {
// *******************************************
  cudaDeviceReset();
  CudaCheckError();
}
 
// *******************************************
void SetDevice(const int deviceId) {
// *******************************************
  // Check if the device ID is valid
  int deviceCount;
  cudaGetDeviceCount(&deviceCount);
  if (deviceId < 0 || deviceId >= deviceCount) {
    printf("Invalid device ID: %i \n", deviceId);
    throw;
  }
 
  cudaSetDevice(deviceId);
  CudaCheckError();
  printf("GPU device set to ID: %i \n", deviceId);
}
 
// *******************************************
// Get number of GPU threads for currently used GPU
int GetNumGPUThreads(const int Device) {
// *******************************************
  int deviceCount;
  cudaGetDeviceCount(&deviceCount);
 
  if (deviceCount == 0) {
    printf("No CUDA devices found");
    throw;
  }
 
  cudaDeviceProp deviceProp;
  cudaGetDeviceProperties(&deviceProp, Device);
 
  // Define the number of threads per block
  int nThreadsBlocks = (deviceProp.multiProcessorCount * deviceProp.maxThreadsPerMultiProcessor);
 
  return nThreadsBlocks;
}
 
// *******************************************
size_t GetL2CacheSize(const int device) {
// *******************************************
  cudaDeviceProp prop;
  cudaError_t err = cudaGetDeviceProperties(&prop, device);
  if (err != cudaSuccess) {
    printf("No CUDA devices found");
    throw;
  }
  return prop.l2CacheSize;  // size in bytes
}
 
// *******************************************
size_t GetMaxTexture1DSize(const int device) {
// *******************************************
  cudaDeviceProp prop;
  cudaError_t err = cudaGetDeviceProperties(&prop, device);
  if (err != cudaSuccess) {
    printf("No CUDA devices found");
    throw;
  }
  return prop.maxTexture1D;
}
 
// *******************************************
size_t GetSharedMemoryPerBlock(const int device) {
// *******************************************
  cudaDeviceProp prop;
  cudaError_t err = cudaGetDeviceProperties(&prop, device);
 
  if (err != cudaSuccess) {
    printf("No CUDA devices found");
    throw;
  }
  return static_cast<size_t>(prop.sharedMemPerBlock);
}