| [eigen] If Eigen code is compiled with -fopenmp when is multi-threading used and how is it controlled? |
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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: [eigen] If Eigen code is compiled with -fopenmp when is multi-threading used and how is it controlled?
- From: Douglas Bates <bates@xxxxxxxxxxxxx>
- Date: Tue, 1 Nov 2011 14:14:01 -0500
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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
environments.