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Add LD_PRELOAD instruction to be able to run Java code that calls OpenCV functions that use the Intel MKL library.

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catree 2018-06-08 15:38:10 +02:00
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doc/tutorials/introduction/java_eclipse/java_eclipse.markdown
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@ -86,3 +86,16 @@ When you run the code you should see 3x3 identity matrix as output.
That is it, whenever you start a new project just add the OpenCV user library that you have defined
to your project and you are good to go. Enjoy your powerful, less painful development environment :)
Running Java code with OpenCV and MKL dependency
------------------------------------------------
You may get the following error (e.g. on Ubuntu) if you have built OpenCV with MKL library with some Java code that calls OpenCV functions
that use Intel MKL:
> Intel MKL FATAL ERROR: Cannot load libmkl_avx2.so or libmkl_def.so.
One solution to solve this on Linux consists in preloading the Intel MKL library (either run the command in a terminal or add it to your `.bashrc` file).
Your command line should be something similar to this (add `$LD_PRELOAD:` before if you have already set the `LD_PRELOAD` variable):
> export LD_PRELOAD=/opt/intel/mkl/lib/intel64/libmkl_core.so:/opt/intel/mkl/lib/intel64/libmkl_sequential.so
Then, run the Eclipse IDE from a terminal that have this environment variable set (`echo $LD_PRELOAD`) and the error should disappear.