title: libstdc++ parallel mode: Who's using it? Is it safe? Any similar projects?
body: <p>the GNU implementation of the C++ Library supports a parallel mode, explained <a href="http://gcc.gnu.org/onlinedocs/libstdc++/manual/parallel_mode.html">here</a>.</p>
  
  <ul>
  <li>Any experiences in using it? Good ones? Bad ones? Especially regarding correctness, but also performance.</li>
  <li>Are there some "more or less serious" projects using it? </li>
  <li>Do you use it with the global turn-on-parallel switch -D_GLIBCXX_PARALLEL or do you use it carefully with manually turn-on specific parallelization functions like: <code>__gnu_parallel::sort(v.begin(), v.end());</code>?</li>
  <li>Are there any similar open source projects? Meaning: more easy parallelization than using openMP.</li>
  </ul>
  
  <p>Thanks for your experiences.</p>
  
  <p>Sascha</p>