akarbown commented on issue #19610:
URL:
https://github.com/apache/incubator-mxnet/issues/19610#issuecomment-842529041
> I'd like to reignite the discussion connected with the following areas and
give some update:
> • Removing MKL_USE_SINGLE_DYNAMIC_LIBRARY (mentioned in the 'Build Flags'
RFC part)
> • Dynamically linking the OpenMP runtime library which is provided by the
compiler/system (mentioned in the 'Build with OpenMP' & 'Interoperability
OpenMP' part)
> • Having two runtime OpenMPs in the same process what resulted in the hang
('Interoperability OpenMP' part).
>
> I think that knowing the root-cause of the hang (described here: #18255)
it's worth to reconsider leaving the MKL_USE_SINGLE_DYNAMIC_LIBRARY and using
that SDL as the solution of the problem connected with local/global symbol
lookup namespaces appeared (RTLD_GLOBAL/RTLD_LOCAL) that appeared in the
runtime while linking all the dynamic libraries separately. Providing that the
issue reported internally will be resolved.
>
> I've removed LLVM OpenMP as the start of the process of enabling compiler
based OpenMP. Thus, compiling with GCC resulted in linking libgomp (GNU
OpenMP). However, it caused some performance drop that needs to be
investigated. (#20092).
The bug will be fixed in the next oneAPI release - 2021.3. Just after the
release I'll open the PR addressing this problem.
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