leezu edited a comment on issue #17641: OpenMP Error URL: https://github.com/apache/incubator-mxnet/issues/17641#issuecomment-590716897 As it's rather difficult to disable clang linking with llvm openmp, we can disable linking intel openmp until a solution is found to only link against intel openmp (may require compiling with icc) or `mkl_rt.so` is fixed to prefer already present `libomp.so` over dynamically loading `libiomp5.so` and running into the conflict.. To stop linking with intel openmp, remove / disable https://github.com/apache/incubator-mxnet/blob/31144c763bfd0fe199b7fe0f23a20555c9731e7a/cmake/Modules/FindMKL.cmake#L126-L145 and set `-DMKL_USE_SINGLE_DYNAMIC_LIBRARY=OFF`. Then we get ``` 0x0000000000000001 (NEEDED) Shared library: [libdl.so.2] 0x0000000000000001 (NEEDED) Shared library: [libpthread.so.0] 0x0000000000000001 (NEEDED) Shared library: [libmkl_intel_lp64.so] 0x0000000000000001 (NEEDED) Shared library: [libmkl_intel_thread.so] 0x0000000000000001 (NEEDED) Shared library: [libmkl_core.so] 0x0000000000000001 (NEEDED) Shared library: [librt.so.1] 0x0000000000000001 (NEEDED) Shared library: [libopencv_highgui.so.3.2] 0x0000000000000001 (NEEDED) Shared library: [libopencv_imgcodecs.so.3.2] 0x0000000000000001 (NEEDED) Shared library: [libopencv_imgproc.so.3.2] 0x0000000000000001 (NEEDED) Shared library: [libopencv_core.so.3.2] 0x0000000000000001 (NEEDED) Shared library: [liblapack.so.3] 0x0000000000000001 (NEEDED) Shared library: [libstdc++.so.6] 0x0000000000000001 (NEEDED) Shared library: [libm.so.6] 0x0000000000000001 (NEEDED) Shared library: [libomp.so.5] 0x0000000000000001 (NEEDED) Shared library: [libgcc_s.so.1] 0x0000000000000001 (NEEDED) Shared library: [libc.so.6] 0x0000000000000001 (NEEDED) Shared library: [ld-linux-x86-64.so.2] ``` and `libmkl` shouldn't attempt loading `iomp` dynamically. This works because llvm openmp is compatible with `iomp`. @icemelon9 I can't reproduce this problem. Please comment out the lines pointed out above and compile with `cmake -DUSE_CUDA=0 -DUSE_MKLDNN=1 DMKL_USE_SINGLE_DYNAMIC_LIBRARY=OFF -GNinja ..; ninja` @cjolivier01 any suggestion how to disable linking llvm openmp for clang if `iomp5` is present?
---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
