title: Multithreaded Multiplication of Large Non-sparse, Non-square Matrices in C/C++
body: <p>All,</p>
  
  <p>I'm looking for recommendations for C or C++ libraries (preferably open source) that use multi-threaded techniques to multiply large, non-square, (e.g. 65536xn in size where n &lt; 65536) non-sparse matrices.  Thanks.</p>
  
  <p>-&amp;&amp;</p>