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Asked: 2024-09-24T20:59:57+05:30 In:

I’m facing an issue while trying to compile my project on Ubuntu, and I’m getting an error that indicates the linker cannot locate the ‘lcudart’ library. Can someone help me understand why this is happening and how I can resolve it?

So, I’m having a bit of a headache trying to compile my project on Ubuntu. I keep running into this annoying error that says the linker can’t find the ‘lcudart’ library. I’ve done some digging but haven’t really made any progress. It’s really frustrating because I feel like I’ve set everything up correctly, but clearly, something’s missing.

I’m working on a CUDA project, and up until this point, everything was going smoothly. I installed CUDA and even confirmed that it’s in my PATH. I’ve tried linking the library manually in my compile command but nothing seems to work. I even checked my `LD_LIBRARY_PATH`, and it looks okay too. It points to the right CUDA folder where the libraries are, so I don’t get why the linker is still throwing this error at me.

I’ve seen some forums where people mention missing symlinks or problems with library versions, but honestly, it’s hard to tell if that’s the case for my situation. Is it common for this ‘lcudart’ library to get lost during installations? Do I need to check for specific version compatibility between CUDA and my Ubuntu version as well? It’s just really tiresome trying to figure out these dependency issues.

And another thing, does anyone know the specific steps to ensure that the library is correctly installed and available for linking? I’ve tried a few commands like `ldconfig`, but maybe I’m doing it wrong? Also, if someone could break it down a bit for me, I’d really appreciate it. Like, what’s the proper way to include it in my project? Any tips or tricks you guys have would be super helpful!

I’m kind of at my wit’s end here, so if you’ve faced something similar or have any insights, I’d love to hear from you! Just hoping to find a quick solution to get back to coding without this ongoing hassle. Thanks in advance!

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    2 Answers



    1. CUDA lcudart Library Issue

      Help with lcudart Library Linker Error

      I totally get your frustration! Dealing with linker errors can be a nightmare, especially with CUDA projects. Here are a few things you can check or try out:

      1. Check CUDA Installation

      First, make sure that CUDA is correctly installed. You can verify the installation with:

      nvcc --version

      This should show you the CUDA version if it’s installed properly.

      2. lcudart Library Location

      The linker looks for libraries in certain default paths. You can check if libcudart.so is actually present where it’s supposed to be. Usually, it’s in:

      /usr/local/cuda/lib64

      3. Update LD_LIBRARY_PATH

      Even if your LD_LIBRARY_PATH looks okay, it’s worth re-checking. Make sure it includes the directory where libcudart.so is located:

      export LD_LIBRARY_PATH=/usr/local/cuda/lib64:$LD_LIBRARY_PATH

      4. Symlinks

      It’s possible that the symlink for libcudart.so is missing or incorrect. You can create it using:

      sudo ln -s /usr/local/cuda/lib64/libcudart.so /usr/lib/libcudart.so

      5. Using nvcc for Compilation

      When compiling your project, make sure you’re using nvcc as your compiler instead of g++. Your compile command should look something like:

      nvcc -o my_project my_project.cu -lcudart

      6. Check Versions

      Make sure your CUDA version is compatible with your Ubuntu version. Sometimes, certain versions have specific requirements.

      7. Running ldconfig

      If you’re having issues with ldconfig, you can run it like this:

      sudo ldconfig

      This should refresh the dynamic linker run-time bindings.

      8. Additional Resources

      There are many helpful forums and documentation online (like NVIDIA’s docs) that can help you troubleshoot further if nothing works.

      Hopefully, these tips help you get that pesky linker error sorted out. Don’t lose hope! Good luck!


    2. It sounds like you are encountering a common issue related to linking the CUDA runtime library on Ubuntu. The error that the linker can’t find the ‘lcudart’ library usually indicates that the library is either not installed, not properly linked, or there’s a version mismatch. First, ensure that the CUDA installation was successful and that the libraries are indeed located in the expected directories. You can check for the `libcudart.so` file in the `/lib64/` directory, where `` is typically something like `/usr/local/cuda`. If it’s missing, you might want to reinstall your CUDA toolkit. Additionally, check your `LD_LIBRARY_PATH` again: it should include the path to the CUDA libraries, which can be set by adding the following line to your `~/.bashrc` or `~/.profile` file: export LD_LIBRARY_PATH=/usr/local/cuda/lib64:$LD_LIBRARY_PATH.

      As for linking, make sure you include the library correctly in your compile command. You should be linking with the flag -lcudart when compiling your project. If you’re using `nvcc`, it’s usually as simple as: nvcc -o my_project my_project.cu -lcudart. If you’re still facing issues, running `sudo ldconfig` can help refresh the linker cache to recognize new libraries. Verifying compatibility between your CUDA version and Ubuntu version might also help, as older or newer versions might have discrepancies. Finally, if everything seems right but you still face the issue, consider seeking symlink fixes: sometimes creating a symbolic link manually in `/usr/lib/` for the libcudart library can resolve linking problems. To create a symlink, you would use a command like sudo ln -s /usr/local/cuda/lib64/libcudart.so /usr/lib/libcudart.so if needed. These steps should help you troubleshoot and hopefully resolve the linker errors.

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