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    <h2>About the comparison ATLAS vs. Eigen</h2> <p>Have a look at this thread on the Eigen mailing list starting here:</p> <ul> <li><a href="http://listengine.tuxfamily.org/lists.tuxfamily.org/eigen/2012/07/msg00052.html" rel="nofollow">http://listengine.tuxfamily.org/lists.tuxfamily.org/eigen/2012/07/msg00052.html</a></li> </ul> <p>It shows for instance that ATLAS outperforms Eigen on the matrix-matrix product by 46%:</p> <ul> <li><a href="http://listengine.tuxfamily.org/lists.tuxfamily.org/eigen/2012/07/msg00062.html" rel="nofollow">http://listengine.tuxfamily.org/lists.tuxfamily.org/eigen/2012/07/msg00062.html</a></li> </ul> <p>More benchmarks results and details on how the benchmarks were done can be found here:</p> <ul> <li><p>Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz:</p> <p><a href="http://www.mathematik.uni-ulm.de/~lehn/bench_FLENS/index.html" rel="nofollow">http://www.mathematik.uni-ulm.de/~lehn/bench_FLENS/index.html</a> </p></li> <li><a href="http://sourceforge.net/tracker/index.php?func=detail&amp;aid=3540928&amp;group_id=23725&amp;atid=379483" rel="nofollow">http://sourceforge.net/tracker/index.php?func=detail&amp;aid=3540928&amp;group_id=23725&amp;atid=379483</a></li> </ul> <p>Edit:</p> <p>For my lecture "Software Basics for High Performance Computing" I created a little framework called ulmBLAS. It contains the ATLAS benchmark suite and students could implement their own matrix-matrix product based on the <a href="https://code.google.com/p/blis/" rel="nofollow">BLIS</a> papers. You can have a look at the final benchmarks which also measure Eigen: </p> <ul> <li><a href="http://apfel.mathematik.uni-ulm.de/~lehn/sghpc/gemm/page14/index.html#toc5" rel="nofollow">http://apfel.mathematik.uni-ulm.de/~lehn/sghpc/gemm/page14/index.html#toc5</a></li> </ul> <p>You can use the <a href="http://apfel.mathematik.uni-ulm.de/~lehn/ulmBLAS/" rel="nofollow">ulmBLAS</a> framework to make your own benchmarks.</p> <p>Also have a look at</p> <ul> <li><a href="http://www.mathematik.uni-ulm.de/~lehn/test_ublas/index.html" rel="nofollow">Matrix-Matrix Product Experiments with uBLAS</a></li> <li><a href="http://www.mathematik.uni-ulm.de/~lehn/test_blaze/index.html" rel="nofollow">Matrix-Matrix Product Experiments with BLAZE</a></li> </ul>
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    1. POHow can the C++ Eigen library perform better than specialized vendor libraries?
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    1. USMichael Lehn
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