Avoid a division in NonBlockingThreadPool::Steal. Looking at profiles we spend ~10-20% of Steal on simply computing random % size. We can reduce random 32-bit int into [0, size) range with a single multiplication and shift. This transformation is described in https://lemire.me/blog/2016/06/27/a-fast-alternative-to-the-modulo-reduction/
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/.
For pull request, bug reports, and feature requests, go to https://gitlab.com/libeigen/eigen.