CODEWITHSUNDEEP
cuda
P Marecki
P Marecki

Reputation: 1138

Proper use of cudaDeviceReset()

Since I'm having suspicions the "black box" (GPU) is not shutting down cleanly in some larger code (others perhaps too), I would include a cudaDeviceReset() at the end of main(). But wait! This would Segmentation fault all instances of classes statically created in main() with non-trivial CUDA code in destructors, right? E.g.

class A {
public:
  cudaEvent_t tt;
  cudaEvent_t uu;
  A() { 
    cudaEventCreate(&tt);
    cudaEventCreate(&uu);
  }
  ~A(){  
    cudaEventDestroy(tt);
    cudaEventDestroy(uu);
  }
};

instantiated statically:

int main() {
  A t;
  cudaDeviceReset();
  return 0;
}

segfaults on exit. Question: is perhaps cudaDeviceReset() invoked automatically on exit from main()?

Otherwise whole useful code of main() should be shifted to some run(), and cudaDeviceReset() should be the as last command in main(), right?

Upvotes: 5

Views: 7843

Answers (1)

phoad
phoad

Reputation: 1861

As indicated by Talonmies, the destructor of class A is called after the cudaDeviceReset() function is already called, namely when the main(..) function finishes.

I think, you may take cudaDeviceReset() to an atexit(..) function.

void myexit() {
  cudaDeviceReset();
}

int main(...) {
  atexit(myexit); 
  A t;
  return 0;
}

Upvotes: 3

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