hello
__global__ void cAdd(int *A, int *B, int *C)
{
int x = threadIdx.x + (blockIdx.x << 4);
int y = threadIdx.y + (blockIdx.x << 4);
int ind = x + (y << 8);
int z = atomicExch(&A[ind],4);
}
I have Visual Studio 2005 team edition and 8600GTS installed on my computer.
8600gts should have computional capability 1.1 but when i try to use atomic functionse
(ie atomicExch) compiler reports
1>sample.cu(58): error: identifier “atomicExch” is undefined
anyone have idea what is wrong ?
:|
You sure you are including the right libraries?
Can you post complete Code? This part looks fine.
#include <stdio.h>
#include <stdlib.h>
#include <cuda_runtime.h>
#include <cutil.h>
/************************************************************************/
/* Init CUDA */
/************************************************************************/
#if __DEVICE_EMULATION__
bool InitCUDA(void){return true;}
#else
bool InitCUDA(void)
{
int count = 0;
int i = 0;
cudaGetDeviceCount(&count);
if(count == 0) {
fprintf(stderr, "There is no device.\n");
return false;
}
for(i = 0; i < count; i++) {
cudaDeviceProp prop;
if(cudaGetDeviceProperties(&prop, i) == cudaSuccess) {
if(prop.major >= 1) {
break;
}
}
}
if(i == count) {
fprintf(stderr, "There is no device supporting CUDA.\n");
return false;
}
cudaSetDevice(i);
printf("CUDA initialized.\n");
return true;
}
#endif
__global__ void cAdd(int *A, int *B, int *C)
{
int x = threadIdx.x + (blockIdx.x << 4);
int y = threadIdx.y + (blockIdx.y << 4);
int ind = x + (y << 8);
int z = atomicExch(&A[ind],4);
}
int main(int argc, char* argv[])
{
if(!InitCUDA()) {
return 0;
}
#if defined CUDA_NO_SM_11_ATOMIC_INTRINSICS
printf("Nije definisano sta god da je \n");
#endif
char *device_result = 0;
char host_result[12] ={0};
float *zec;
int A[256][256];
int B[256][256];
int C[256][256];
int *dA;
int *dB;
int *dC;
int i,j,mSize = 256 * 256 * sizeof(int);
cudaError_t err;
for (i = 0; i <256; i++)
for (j =0; j<256; j++)
{
A[i][j] = 3;
B[i][j] = 2;
C[i][j] = 0;
}
err = cudaMalloc( (void **) &dA, 256 * 256 * sizeof(int) );
if (err != cudaSuccess )
return 1;
err = cudaMalloc( (void **) &dB, 256 * 256 * sizeof(int) );
if (err != cudaSuccess )
return 1;
err = cudaMalloc( (void **) &dC, 256 * 256 * sizeof(int) );
if (err != cudaSuccess )
return 1;
cudaMemcpy(dA,A,mSize,cudaMemcpyHostToDevice);
if (err != cudaSuccess )
return 1;
cudaMemcpy(dB,B,mSize,cudaMemcpyHostToDevice);
if (err != cudaSuccess )
return 1;
cudaMemcpy(dC,C,mSize,cudaMemcpyHostToDevice);
if (err != cudaSuccess )
return 1;
dim3 blok(16,16);
dim3 grid(16,16);
cAdd<<<grid,blok>>>(dA,dB,dC);
cudaMemcpy(A,dA,mSize,cudaMemcpyDeviceToHost);
cudaMemcpy(B,dB,mSize,cudaMemcpyDeviceToHost);
cudaMemcpy(C,dC,mSize,cudaMemcpyDeviceToHost);
cudaFree(dA);
cudaFree(dB);
cudaFree(dC);
for (i = 20; i<30; i++)
printf("%d \n", C[i][i]);
getchar();
return 0;
}
Are you compiling with “-arch=sm_11” on the nvcc command line?
yes i did. BUT as i said im using vs2005 with CUDA PROJECT WIZARD and that was the problem. When i go to project properties/CUDA/COMMAND LINE/ and add -arch sm_11
option compiler actualy ignores it when compiling code. I had to go visual sutdio/VC/VCprojectDefaults/cuda.properties to change command line. now it works fine
thanks
I’m having the same problem. Where are you changing the code? within VS08 or regedit? I try to look in both but I was unable to find the correct line to change
I was able to add the “-arch sm_11” to the custom build of my .cu file in VS08 (right click on .cu file and then select the custom build property). But when I do that the execution end with a “invalid device function” even if I do not use any atomic function. Without the “-arch sm_11” the program executes correctly, but I cannot use atomic.
Any ideas?
Thanks
PS: I’m running on Windows XP with 9800gx2
I solved my problem and now it compiles correctly. What I had to do is remove the tesla card C870 and leave inside the PC just the 9800gx2. For some reasons even if I was setting the CUDA device to 1 to skip the Tesla card, the compiler was still complaining.
The CUDA wizard doesn’t let you add compile flags? That should really be fixed…
Where do I add “-arch sm_11” when I compile a CUDA mex-file for Matlab ?
Hi my problem is same. “Where do I add “-arch sm_11” when I compile a CUDA mex-file for Matlab ?”
Please help.
In the file nvopts.sh
Thank you very much. Would please tell me where is the location of nvopts.sh file. I am new in CUDA programming and couldn’t find out the file. please help again.
Hello,
I couldn’t find nvopts.sh in Matlab_Cuda_1.1 for Windows. My atomic functions in mex files are showing error “undefined” during compilation. Please tell me what can I do now?
I’ve only used Matlab CUDA for Linux.
I am also having trouble compiling my CUDA code after adding atomic functions. I am using VS2010.
I have included the line:
#include <sm_12_atomic_functions.h>
This is the error I receive:
1>CudaBuild:
1> Compiling CUDA source file main.cu...
1>
1> C:\Users\Santos\Documents\Visual Studio 2010\Projects\CUDA_SPH\CUDA_OpenGL>"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v3.2\bin\nvcc.exe" -gencode=arch=compute_10,code=\"sm_10,compute_10\" --use-local-env --cl-version 2008 -ccbin "C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\bin" -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v3.2\include" -G0 --keep-dir "Debug\" -maxrregcount=32 --machine 32 --compile -arch sm_12 -D_NEXUS_DEBUG -g -Xcompiler "/EHsc /nologo /Od /Zi /MDd " -o "Debug\main.obj" "C:\Users\Santos\Documents\Visual Studio 2010\Projects\CUDA_SPH\CUDA_OpenGL\main.cu"
1> main.cu
1> tmpxft_00000e2c_00000000-3_main.compute_12.cudafe1.gpu
1> tmpxft_00000e2c_00000000-7_main.compute_12.cudafe2.gpu
1> main.cu
1>C:/Users/Santos/Documents/Visual Studio 2010/Projects/CUDA_SPH/CUDA_OpenGL/main.cu(405): error : identifier "atomicExch" is undefined
1>
1>C:/Users/Santos/Documents/Visual Studio 2010/Projects/CUDA_SPH/CUDA_OpenGL/main.cu(411): error : identifier "atomicAdd" is undefined
1>
1> 2 errors detected in the compilation of "C:/Users/Santos/AppData/Local/Temp/tmpxft_00000e2c_00000000-9_main.compute_10.cpp1.ii".
1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\BuildCustomizations\CUDA 3.2.targets(272,3): error MSB3721: The command ""C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v3.2\bin\nvcc.exe" -gencode=arch=compute_10,code=\"sm_10,compute_10\" --use-local-env --cl-version 2008 -ccbin "C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\bin" -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v3.2\include" -G0 --keep-dir "Debug\" -maxrregcount=32 --machine 32 --compile -arch sm_12 -D_NEXUS_DEBUG -g -Xcompiler "/EHsc /nologo /Od /Zi /MDd " -o "Debug\main.obj" "C:\Users\Santos\Documents\Visual Studio 2010\Projects\CUDA_SPH\CUDA_OpenGL\main.cu"" exited with code 2.
1>
1>Build FAILED.
I can see that the flag -arch sm_12 is set, so I am unsure as to why this is failing. If anyone has any insight I would very much appreciate it. Thanks for your time.
Ok, I got it to compile and I just wanted to post the solution for any other VS2010 users.
Navigate to:
Project->Properties->Configuration Properties->CUDA C/C+±>Device
Then under “Code Generation”
Change “compute_10,sm_10” to “compute_20,sm_20”.
Thanks for your reply. Is there anyone who have used atomic functions of cuda in matlab mex files in windows??? I badly need it for my research, plz help me.