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Asked: 2026-06-10T10:25:52+00:00

My problem is very much like this one . I run the simplest CUDA

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My problem is very much like this one. I run the simplest CUDA program but the kernel doesn’t launch. However, I am sure that my CUDA installation is ok, since I can run complicated CUDA projects consisting of several files (which I took from someone else) with no problems. In these projects, compilation and linking is done through makefiles with a lot of flags. I think the problem is in the correct flags to use while compiling. I simply use a command like this:
nvcc -arch=sm_20 -lcudart test.cu with a such a program (to run on a linux machine):

 __global__ void myKernel() 
{ 

    cuPrintf("Hello, world from the device!\n"); 


} 
int main() 
{ 
    cudaPrintfInit(); 
    myKernel<<<1,10>>>(); 
    cudaPrintfDisplay(stdout, true);    
    cudaPrintfEnd(); 
}

The program compiles correctly. When I add cudaMemcpy() operations, it returns no error. Any suggestion on why the kernel doesn’t launch ?

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1 Answer

  1. Editorial Team

    Are you sure that your CUDA device supports the SM_20 architecture?

    Remove the arch= option from your nvcc command line and rebuild everything. This compiles for the 1.0 CUDA architecture, which will be supported on all CUDA devices. If it still doesn’t run, do a build clean and make sure there are no object files left anywhere. Then rebuild and run.

    Also, arch= refers to the virtual architecture, which should be something like compute_10. sm_20 is the real architecture and I believe should be used with the code= switch, not arch=.

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