问题描述
我试图编译以下程序，这是一个CUDA mex文件MATLAB，使用Visual Studio 2013.
有。这将自动获得我上面提到的标准MEX设置。 编辑：我已将Parallel Computing Toolbox支持添加到属性表。您只需要添加如上所示的cudart_static.lib部分，并选择CUDA Build Customization以使用nvcc编译.cu文件。
添加CUDA 6.5 SDK 首先，右键单击项目（而不是解决方案）：
检查您要使用的CUDA自定义（本例中为SDK 6.5）：
>
为了防止你试图编辑这些字段，请不要编辑它们：
I am trying to compile following program, which is a CUDA mex file for MATLAB, using Visual Studio 2013.
There are instructions available on MATLAB's official website only for C++ Mex files , not for the CUDA mex.
So I made following additional changes to my project settings while following the official instructions on Mathworks:
1. I created a project using Visual studio project with my installed CUDA 6.5 runtime.
2. Included the libs (libmx.lib,libmex.lib,libmat.lib,gpu.lib) in Linker properties of my VS project,
3. Added a directory include, (MATLABROOT)\toolbox\distcomp\gpu\extern\include;
Still I get many unresolved external symbol error. What is the right way to do this, since there is no official documentation available for compiling CUDA Mex using VS IDE ? Does anyone has any idea what is the proper way to do this ? Surely I am missing some setting, can someone help please ?
My Program (copied from MATLAB example file, mexGPUExample.cu ) is as follow:
**
/*
* Example of how to use the mxGPUArray API in a MEX file. This example shows
* how to write a MEX function that takes a gpuArray input and returns a
* gpuArray output, e.g. B=mexFunction(A).
*
* Copyright 2012 The MathWorks, Inc.
*/
#include "cuda_runtime.h"
#include "device_launch_parameters.h"
#include "mex.h"
#include "gpu/mxGPUArray.h"
/*
* Device code
*/
void __global__ TimesTwo(double const * const A,
double * const B,
int const N)
{
/* Calculate the global linear index, assuming a 1-d grid. */
int const i = blockDim.x * blockIdx.x + threadIdx.x;
if (i < N) {
B[i] = 2.0 * A[i];
}
}
/*
* Host code
*/
void mexFunction(int nlhs, mxArray *plhs[],
int nrhs, mxArray const *prhs[])
{
/* Declare all variables.*/
mxGPUArray const *A;
mxGPUArray *B;
double const *d_A;
double *d_B;
int N;
char const * const errId = "parallel:gpu:mexGPUExample:InvalidInput";
char const * const errMsg = "Invalid input to MEX file.";
/* Choose a reasonably sized number of threads for the block. */
int const threadsPerBlock = 256;
int blocksPerGrid;
/* Initialize the MathWorks GPU API. */
mxInitGPU();
/* Throw an error if the input is not a GPU array. */
if ((nrhs != 1) || !(mxIsGPUArray(prhs[0]))) {
mexErrMsgIdAndTxt(errId, errMsg);
}
A = mxGPUCreateFromMxArray(prhs[0]);
/*
* Verify that A really is a double array before extracting the pointer.
*/
if (mxGPUGetClassID(A) != mxDOUBLE_CLASS) {
mexErrMsgIdAndTxt(errId, errMsg);
}
/*
* Now that we have verified the data type, extract a pointer to the input
* data on the device.
*/
d_A = (double const *)(mxGPUGetDataReadOnly(A));
/* Create a GPUArray to hold the result and get its underlying pointer. */
B = mxGPUCreateGPUArray(mxGPUGetNumberOfDimensions(A),
mxGPUGetDimensions(A),
mxGPUGetClassID(A),
mxGPUGetComplexity(A),
MX_GPU_DO_NOT_INITIALIZE);
d_B = (double *)(mxGPUGetData(B));
/*
* Call the kernel using the CUDA runtime API. We are using a 1-d grid here,
* and it would be possible for the number of elements to be too large for
* the grid. For this example we are not guarding against this possibility.
*/
N = (int)(mxGPUGetNumberOfElements(A));
blocksPerGrid = (N + threadsPerBlock - 1) / threadsPerBlock;
TimesTwo <<< blocksPerGrid, threadsPerBlock >>>(d_A, d_B, N);
/* Wrap the result up as a MATLAB gpuArray for return. */
plhs[0] = mxGPUCreateMxArrayOnGPU(B);
/*
* The mxGPUArray pointers are host-side structures that refer to device
* data. These must be destroyed before leaving the MEX function.
*/
mxGPUDestroyGPUArray(A);
mxGPUDestroyGPUArray(B);
}
Errors I get when I try to compile my program :
Error 66 error LNK1120: 64 unresolved externals
Error 64 error LNK2001: unresolved external symbol _fltused
Error 62 error LNK2001: unresolved external symbol _RTC_InitBase
Error 63 error LNK2001: unresolved external symbol _RTC_Shutdown
Error 65 error LNK2001: unresolved external symbol mainCRTStartup
Error 58 error LNK2019: unresolved external symbol __imp__dsign referenced in function "bool __cdecl signbit(double)" (?signbit@@YA_NN@Z)
Error 60 error LNK2019: unresolved external symbol __imp__fdsign referenced in function "bool __cdecl signbit(float)" (?signbit@@YA_NM@Z)
Error 61 error LNK2019: unresolved external symbol __imp__hypotf referenced in function hypotf
Error 59 error LNK2019: unresolved external symbol __imp__ldsign referenced in function "bool __cdecl signbit(long double)" (?signbit@@YA_NO@Z)
Error 39 error LNK2019: unresolved external symbol __imp_acosf referenced in function "float __cdecl acos(float)" (?acos@@YAMM@Z)
Error 12 error LNK2019: unresolved external symbol __imp_acoshf referenced in function "float __cdecl acosh(float)" (?acosh@@YAMM@Z)
Error 40 error LNK2019: unresolved external symbol __imp_asinf referenced in function "float __cdecl asin(float)" (?asin@@YAMM@Z)
Error 13 error LNK2019: unresolved external symbol __imp_asinhf referenced in function "float __cdecl asinh(float)" (?asinh@@YAMM@Z)
Error 42 error LNK2019: unresolved external symbol __imp_atan2f referenced in function "float __cdecl atan2(float,float)" (?atan2@@YAMMM@Z)
Error 41 error LNK2019: unresolved external symbol __imp_atanf referenced in function "float __cdecl atan(float)" (?atan@@YAMM@Z)
Error 14 error LNK2019: unresolved external symbol __imp_atanhf referenced in function "float __cdecl atanh(float)" (?atanh@@YAMM@Z) D:\GitHub\arrayfire-windows-scripts\SimpleCUDAProj\CUDA_Mex\CUDA_Mex\CUDA_Times_Two.cu.obj CUDA_Mex
Error 29 error LNK2019: unresolved external symbol __imp_cbrtf referenced in function "float __cdecl cbrt(float)" (?cbrt@@YAMM@Z)
Error 55 error LNK2019: unresolved external symbol __imp_ceilf referenced in function "float __cdecl ceil(float)" (?ceil@@YAMM@Z)
Error 36 error LNK2019: unresolved external symbol __imp_copysignf referenced in function "float __cdecl copysign(float,float)" (?copysign@@YAMMM@Z)
Error 43 error LNK2019: unresolved external symbol __imp_cosf referenced in function "float __cdecl cos(float)" (?cos@@YAMM@Z)
Error 46 error LNK2019: unresolved external symbol __imp_coshf referenced in function "float __cdecl cosh(float)" (?cosh@@YAMM@Z)
Error 33 error LNK2019: unresolved external symbol __imp_erfcf referenced in function "float __cdecl erfc(float)" (?erfc@@YAMM@Z)
Error 32 error LNK2019: unresolved external symbol __imp_erff referenced in function "float __cdecl erf(float)" (?erf@@YAMM@Z)
Error 8 error LNK2019: unresolved external symbol __imp_exp2f referenced in function "float __cdecl exp2(float)" (?exp2@@YAMM@Z)
Error 49 error LNK2019: unresolved external symbol __imp_expf referenced in function "float __cdecl exp(float)" (?exp@@YAMM@Z)
Error 9 error LNK2019: unresolved external symbol __imp_expm1f referenced in function "float __cdecl expm1(float)" (?expm1@@YAMM@Z)
Error 28 error LNK2019: unresolved external symbol __imp_fdimf referenced in function "float __cdecl fdim(float,float)" (?fdim@@YAMMM@Z)
Error 56 error LNK2019: unresolved external symbol __imp_floorf referenced in function "float __cdecl floor(float)" (?floor@@YAMM@Z)
Error 38 error LNK2019: unresolved external symbol __imp_fmaf referenced in function "float __cdecl fma(float,float,float)" (?fma@@YAMMMM@Z)
Error 7 error LNK2019: unresolved external symbol __imp_fmaxf referenced in function "float __cdecl fmax(float,float)" (?fmax@@YAMMM@Z)
Error 6 error LNK2019: unresolved external symbol __imp_fminf referenced in function "float __cdecl fmin(float,float)" (?fmin@@YAMMM@Z)
Error 57 error LNK2019: unresolved external symbol __imp_fmodf referenced in function "float __cdecl fmod(float,float)" (?fmod@@YAMMM@Z)
Error 19 error LNK2019: unresolved external symbol __imp_frexp referenced in function frexpf
Error 17 error LNK2019: unresolved external symbol __imp_ilogbf referenced in function "int __cdecl ilogb(float)" (?ilogb@@YAHM@Z)
Error 15 error LNK2019: unresolved external symbol __imp_ldexp referenced in function ldexpf
Error 34 error LNK2019: unresolved external symbol __imp_lgammaf referenced in function "float __cdecl lgamma(float)" (?lgamma@@YAMM@Z)
Error 25 error LNK2019: unresolved external symbol __imp_llrintf referenced in function "__int64 __cdecl llrint(float)" (?llrint@@YA_JM@Z)
Error 22 error LNK2019: unresolved external symbol __imp_llroundf referenced in function "__int64 __cdecl llround(float)" (?llround@@YA_JM@Z)
Error 51 error LNK2019: unresolved external symbol __imp_log10f referenced in function "float __cdecl log10(float)" (?log10@@YAMM@Z)
Error 11 error LNK2019: unresolved external symbol __imp_log1pf referenced in function "float __cdecl log1p(float)" (?log1p@@YAMM@Z)
Error 10 error LNK2019: unresolved external symbol __imp_log2f referenced in function "float __cdecl log2(float)" (?log2@@YAMM@Z)
Error 16 error LNK2019: unresolved external symbol __imp_logbf referenced in function "float __cdecl logb(float)" (?logb@@YAMM@Z)
Error 50 error LNK2019: unresolved external symbol __imp_logf referenced in function "float __cdecl log(float)" (?log@@YAMM@Z)
Error 24 error LNK2019: unresolved external symbol __imp_lrintf referenced in function "long __cdecl lrint(float)" (?lrint@@YAJM@Z)
Error 21 error LNK2019: unresolved external symbol __imp_lroundf referenced in function "long __cdecl lround(float)" (?lround@@YAJM@Z)
Error 52 error LNK2019: unresolved external symbol __imp_modff referenced in function "float __cdecl modf(float,float *)" (?modf@@YAMMPEAM@Z)
Error 26 error LNK2019: unresolved external symbol __imp_nearbyintf referenced in function "float __cdecl nearbyint(float)" (?nearbyint@@YAMM@Z)
Error 37 error LNK2019: unresolved external symbol __imp_nextafterf referenced in function "float __cdecl nextafter(float,float)" (?nextafter@@YAMMM@Z)
Error 53 error LNK2019: unresolved external symbol __imp_powf referenced in function "float __cdecl pow(float,float)" (?pow@@YAMMM@Z)
Error 30 error LNK2019: unresolved external symbol __imp_remainderf referenced in function "float __cdecl remainder(float,float)" (?remainder@@YAMMM@Z)
Error 31 error LNK2019: unresolved external symbol __imp_remquof referenced in function "float __cdecl remquo(float,float,int *)" (?remquo@@YAMMMPEAH@Z)
Error 23 error LNK2019: unresolved external symbol __imp_rintf referenced in function "float __cdecl rint(float)" (?rint@@YAMM@Z)
Error 20 error LNK2019: unresolved external symbol __imp_roundf referenced in function "float __cdecl round(float)" (?round@@YAMM@Z)
Error 18 error LNK2019: unresolved external symbol __imp_scalblnf referenced in function "float __cdecl scalbln(float,long)" (?scalbln@@YAMMJ@Z)
Error 44 error LNK2019: unresolved external symbol __imp_sinf referenced in function "float __cdecl sin(float)" (?sin@@YAMM@Z)
Error 47 error LNK2019: unresolved external symbol __imp_sinhf referenced in function "float __cdecl sinh(float)" (?sinh@@YAMM@Z)
Error 54 error LNK2019: unresolved external symbol __imp_sqrtf referenced in function "float __cdecl sqrt(float)" (?sqrt@@YAMM@Z)
Error 45 error LNK2019: unresolved external symbol __imp_tanf referenced in function "float __cdecl tan(float)" (?tan@@YAMM@Z)
Error 48 error LNK2019: unresolved external symbol __imp_tanhf referenced in function "float __cdecl tanh(float)" (?tanh@@YAMM@Z)
Error 35 error LNK2019: unresolved external symbol __imp_tgammaf referenced in function "float __cdecl tgamma(float)" (?tgamma@@YAMM@Z)
Error 27 error LNK2019: unresolved external symbol __imp_truncf referenced in function "float __cdecl trunc(float)" (?trunc@@YAMM@Z)
Error 2 error LNK2019: unresolved external symbol atexit referenced in function "void __cdecl __nv_cudaEntityRegisterCallback(void * *)" (?__nv_cudaEntityRegisterCallback@@YAXPEAPEAX@Z)
Error 5 error LNK2019: unresolved external symbol fabs referenced in function "double __cdecl abs(double)" (?abs@@YANN@Z)
Error 3 error LNK2019: unresolved external symbol labs referenced in function "long __cdecl abs(long)" (?abs@@YAJJ@Z)
Error 4 error LNK2019: unresolved external symbol llabs referenced in function "__int64 __cdecl abs(__int64)" (?abs@@YA_J_J@Z)
The main issue in your case seems to be that you have chosen the wrong project type. Probably you are using an MFC DLL instead of a regular Win32 project (with DLL option). However, there are more settings needed to build MEX files that (a) use the mxGPUArray type that is part of the Parallel Computing Toolbox and (b) contain a CUDA kernel (custom GPU device code) that is compiled with the NVIDIA CUDA SDK compiler, nvcc.
Assuming you've configured the usual MEX-related settings, you select the CUDA "Build Customization" to configure nvcc as the compiler for .cu files. Then you may also need to specify the CUDA runtime library, while ensuring that you still have all the standard Windows library dependencies linked by checking the "Inherit from parent or project defaults" box:
It compiled and linked fine for me this way.
However, I set up my Visual Studio project using a property sheet (MATLAB.props) as described here. This will automatically get the standard MEX settings I mentioned above. EDIT: I've added Parallel Computing Toolbox support to the property sheet. You just need to add the cudart_static.lib part as shown above and choose the CUDA Build Customization to compile a .cu file with nvcc.
Adding CUDA 6.5 SDK settings via Build Customizations. First, right click on the project (not solution):
Check the CUDA customization you want to use (SDK 6.5 in this case):
And just in case you were tempted to edit these fields, DON'T EVER EDIT THEM:
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