Hello, I hope this email finds you well. I am writing to seek assistance regarding challenges I have encountered while integrating ViennaCL into my project and configuring it to work with OpenCL.
Initially, I was puzzled by a significant performance gap between GPU and CPU executions when performing matrix multiplication operations using the Eigen and ViennaCL libraries in C++. However, upon further investigation, I discovered that ViennaCL needs to be explicitly instructed to utilize OpenCL for GPU computations. In an attempt to address this issue, I added the necessary configuration flags to my premake script, including defining VIENNACL_WITH_OPENCL, linking to OpenCL libraries, and specifying library directories. However, despite these efforts, I encountered compilation errors that I have been unable to resolve.The error message I received reads as follows: terminate called after throwing an instance of 'viennacl::ocl::unknown_error' what(): ViennaCL: FATAL ERROR: ViennaCL encountered an unknown OpenCL error. In some cases, this might be due to an invalid global work size, but it can also be due to several compilation errors. If you think that this is a bug in ViennaCL, please report it at [email protected] and supply at least the following information: * Operating System * Which OpenCL implementation (AMD, NVIDIA, etc.) * ViennaCL version Despite my best efforts, I have been unable to extract relevant information from the documentation to properly configure ViennaCL for my project. I have reviewed example CMake configurations provided with ViennaCL but have struggled to apply them to my premake setup. At this juncture, I find myself at an impasse and am reaching out to seek guidance and assistance from the community. If you have any insights, suggestions, or solutions regarding the correct configuration of ViennaCL with OpenCL, or if you can offer assistance in resolving the compilation errors I have encountered, I would greatly appreciate your ideas. link to my question in stack: https://stackoverflow.com/questions/78437721/performance-discrepancy-between-gpu-and-cpu-for-matrix-multiplication-eigen-vs Thank you very much for your time and assistance. I look forward to hearing from you soon. Best regards, -- Francisco Ossian Lopes Neto
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