Hello,
an unknown OpenCL error is an indication that maybe your OpenCL
installation isn't working correctly. Can you please verify that OpenCL
works fine (i.e. outside of ViennaCL)?
I'm not sure whether the problem has been resolved already - the
stackoverflow page suggests so.
Best regards,
Karli
On 5/8/24 17:41, Francisco Ossian wrote:
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]
<mailto:[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 <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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https://lists.sourceforge.net/lists/listinfo/viennacl-support
