VISUAL STUDIO 2013 : error LNK2019: unresolved external symbol - cuRAND - Random Number Generator

3
votes

I have researched for hours,

  1. MSDN Microsoft - Linker Tools Error LNK2019
  2. How to solve the error LNK2019: unresolved external symbol - function?
  3. What is an undefined reference/unresolved external symbol error and how do I fix it?
  4. Error LNK2019: unresolved external symbol _wWinMain@16 referenced in function ___tmainCRTStartup

  5. How to get rid of this error: "MSVCRTD.lib(crtexe.obj) : error LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup"

    but have not found a way to resolve the following error,

Error	1	error LNK2019: unresolved external symbol _curandCreateGenerator@8 referenced in function _GPU_RNG	F:\New\Eks\Visual Studio 2013\PEOPLE PROJECTS\RNGTests\CURANDRNGLib\CURANDRNG.cu.obj	CURANDRNGLib
Error	2	error LNK2019: unresolved external symbol _curandCreateGeneratorHost@8 referenced in function _CPU_RNG	F:\New\Eks\Visual Studio 2013\PEOPLE PROJECTS\RNGTests\CURANDRNGLib\CURANDRNG.cu.obj	CURANDRNGLib
Error	3	error LNK2019: unresolved external symbol _curandDestroyGenerator@4 referenced in function _GPU_RNG	F:\New\Eks\Visual Studio 2013\PEOPLE PROJECTS\RNGTests\CURANDRNGLib\CURANDRNG.cu.obj	CURANDRNGLib
Error	4	error LNK2019: unresolved external symbol _curandSetPseudoRandomGeneratorSeed@12 referenced in function _GPU_RNG	F:\New\Eks\Visual Studio 2013\PEOPLE PROJECTS\RNGTests\CURANDRNGLib\CURANDRNG.cu.obj	CURANDRNGLib
Error	5	error LNK2019: unresolved external symbol _curandGenerateUniform@12 referenced in function _GPU_RNG	F:\New\Eks\Visual Studio 2013\PEOPLE PROJECTS\RNGTests\CURANDRNGLib\CURANDRNG.cu.obj	CURANDRNGLib

CURANDRNGLib.cu

#include <cuda.h>
#include <cuda_runtime.h>
#include <curand.h>
#include <curand_kernel.h>

using namespace std;
extern "C" __declspec(dllexport) void __cdecl GPU_RNG(float* , unsigned int , unsigned int);
extern "C" __declspec(dllexport) void __cdecl CPU_RNG(float* , unsigned int , unsigned int);


extern void GPU_RNG(float * h_randomData, unsigned int dataCount, unsigned int mainSeed)
{
	float * d_randomData = 0;

	//allocate device memory
	size_t randomDataSize = dataCount * sizeof(float);
	cudaMalloc((void**)&d_randomData, randomDataSize);

	curandGenerator_t m_prng;
	//Create a new generator
	curandCreateGenerator(&m_prng, CURAND_RNG_PSEUDO_DEFAULT);
	//Set the generator options
	curandSetPseudoRandomGeneratorSeed(m_prng, (unsigned long) mainSeed);
	//Generate random numbers
	curandGenerateUniform(m_prng, d_randomData, dataCount);
	//Copy memory back to the device
	cudaMemcpy(h_randomData, d_randomData, randomDataSize, cudaMemcpyDeviceToHost);
	//Clean
	curandDestroyGenerator(m_prng);
	//free device memory
	cudaFree(d_randomData);
}

extern void CPU_RNG(float * h_randomData, unsigned int dataCount, unsigned int mainSeed)
{
	curandGenerator_t m_prng;
	//Create a new generator
	curandCreateGeneratorHost(&m_prng,CURAND_RNG_PSEUDO_DEFAULT);
	//Set the generator options
	curandSetPseudoRandomGeneratorSeed(m_prng, (unsigned long) mainSeed);
	//Generate random numbers
	curandGenerateUniform(m_prng, h_randomData, dataCount);
	//Clean
	curandDestroyGenerator(m_prng);
}

Should I add a #include? (I'm not good at english very much)

2
c++visual-studiocuda
can you build any of the CUDA sample projects that use CURAND? If so, you can study those to understand proper project settings. – Robert Crovella
@Robert Yes, i can. – Khalif21
Those projects have all the necessary settings to use CURAND without getting the undefined reference errors. – Robert Crovella
So that means you should be able to study those projects (or just re-use one of them) and get your issue sorted out. AFAIK none of those projects are creating a dll, but that is a separate issue and presumably you have that figured out (you don't seem to be asking about it here). – Robert Crovella
@Robert I have know it. – Khalif21

2 Answers

1
votes

I guess you might have developed your code on Win32 platform. There is only basic CUDA API support but no CURAND library support on Win32. You can try switching to developing a 64-bit version. (Project -> Properties -> change the platform option on top)

3
votes

You should be linking against curand.lib - add it in the property sheets under Linker -> Input -> Additional Dependencies.

This is how you turn on verbose linker output: enter image description here