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[docs] documentation improvement (#976)  
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Recommendations When Using gcc
==============================

It is recommended to use ``-O3 -mtune=native`` to achieve maximum speed during LightGBM training.

Using Intel Ivy Bridge CPU on 1M x 1K Bosch dataset, the performance increases as follow:

+-------------------------------------+---------------------+
| Compilation Flag                    | Performance Index   |
+=====================================+=====================+
| ``-O2 -mtune=core2``                | 100.00%             |
+-------------------------------------+---------------------+
| ``-O2 -mtune=native``               | 100.90%             |
+-------------------------------------+---------------------+
| ``-O3 -mtune=native``               | 102.78%             |
+-------------------------------------+---------------------+
| ``-O3 -ffast-math -mtune=native``   | 100.64%             |
+-------------------------------------+---------------------+

You can find more details on the experimentation below:

-  `Laurae++/Benchmarks <https://sites.google.com/view/lauraepp/new-benchmarks/old-benchmarks>`__

-  `Laurae2/gbt\_benchmarks <https://github.com/Laurae2/gbt_benchmarks>`__

-  `Laurae's Benchmark Master Data (Interactive) <https://public.tableau.com/views/gbt_benchmarks/Master-Data?:showVizHome=no>`__

-  `Kaggle Paris Meetup #12 Slides <https://drive.google.com/file/d/0B6qJBmoIxFe0ZHNCOXdoRWMxUm8/view>`__

Some explanatory pictures:

.. image:: ./_static/images/gcc-table.png
   :align: center

.. image:: ./_static/images/gcc-bars.png
   :align: center

.. image:: ./_static/images/gcc-chart.png
   :align: center

.. image:: ./_static/images/gcc-comparison-1.png
   :align: center

.. image:: ./_static/images/gcc-comparison-2.png
   :align: center

.. image:: ./_static/images/gcc-meetup-1.png
   :align: center

.. image:: ./_static/images/gcc-meetup-2.png
   :align: center