CODEWITHSUNDEEP
cudacaffe
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Reputation: 6498

error: function "atomicAdd(double *, double)" has already been defined

I get this error while trying to compile the caffe derivative DeepLab_v2 on Ubuntu 14.04.5 with Cuda 8.0.

Does anyone know how to solve this?

DeepLab_v2 compiles fine on another computer that has Cuda 7.5, but since in my current computer I have a Pascal Titan X, I probably need to use Cuda 8.0.

Upvotes: 12

Views: 8866

Answers (1)

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Reputation: 6498

I finally got it working with the help of @Robert Crovella's comment. I had to modify the file common.cuh from the DeepLab_v2 master branch in the following way:

#ifndef CAFFE_COMMON_CUH_
#define CAFFE_COMMON_CUH_

  #include <cuda.h>

  #if defined(__CUDA_ARCH__) && __CUDA_ARCH__ < 600
  static __inline__ __device__ double atomicAdd(double *address, double val) {
    unsigned long long int* address_as_ull = (unsigned long long int*)address;
    unsigned long long int old = *address_as_ull, assumed;
    if (val==0.0)
      return __longlong_as_double(old);
    do {
      assumed = old;
      old = atomicCAS(address_as_ull, assumed, __double_as_longlong(val +__longlong_as_double(assumed)));
    } while (assumed != old);
    return __longlong_as_double(old);
  }
  #endif

#endif

Upvotes: 36

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