[GitHub] [incubator-mxnet] kpuatamazon commented on issue #19502: CI slowdown on CentOS CPU related to OpenMP and intgemm

[GitBox <gi...@apache.org>]

kpuatamazon commented on issue #19502:
URL: https://github.com/apache/incubator-mxnet/issues/19502#issuecomment-724176697


   The Centos 7 OpenMP performance is terrible. 
   
   To test @leezu 's hypothesis, I created a branch https://github.com/kpuatamazon/incubator-mxnet/tree/removeopenmp without the 3rdparty OpenMP.  This means there should only be the OS-/compiler-provided OpenMP.  
   
   The same test above took 542.95s with intgemm's CMakeLists.txt as is, and 539.99s with my OpenMP commented out like below.  No real difference here.  
   ```
   #option(USE_OPENMP "Use OpenMP" OFF)
   #if (USE_OPENMP)
   #  message(STATUS "Compiling with OpenMP")
   #  find_package(OpenMP)
   #  if (NOT ${OpenMP_CXX_FOUND})
   #    message(SEND_ERROR "OpenMP requested but C++ support not found")
   #  endif()
   #  add_compile_options(${OpenMP_CXX_FLAGS})
   #  target_link_libraries(intgemm PUBLIC OpenMP::OpenMP_CXX)
   #endif()
   ```


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