[eigen] If Eigen code is compiled with -fopenmp when is multi-threading used and how is it controlled?

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Is there documentation on when multi-threading is used and how it is
controlled.  I see that various symbols associated with openmp are
incorporated in the executable and it appears from
Eigen/src/Core/products/Parallelizer.h that they will be used in a
gemm operation.  I am particularly interested in whether the
..rankUpdate() method for SelfAdjointView's would use the parallel code
and, if so, how I would control it.  I would prefer to use an
environment variable if possible instead of hard-wiring a call into
the code because the executable will be used in different

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