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Using a static instance of a class to initialize the values for the CPU cache sizes guarantees thread-safe initialization of the values when using C++11. Therefore under C++11 it is no longer necessary to call Eigen::initParallel() before calling any eigen functions on different threads.
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
For more information go to http://eigen.tuxfamily.org/.
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