Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for a snapshot of the develop branch, built from commit f1aed1ddda.
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Benchmark

The benchmark with 100000000 64 bits integers,comparing with std::stable_sort of GCC 6.3 compiler and spinsort, running on a Intel i7-5820K CPU @ 3.30GH shows the mentioned characteristics.

Data                         |std::stable_sort| spin_sort  |flat_stable_sort |
-----------------------------+----------------+------------+-----------------+
random                       |     8.62       |    9.73    |     10.80       |
                             |                |            |                 |
sorted                       |     4.88       |    0.06    |      0.07       |
sorted + 0.1% end            |     4.92       |    0.41    |      0.36       |
sorted +   1% end            |     4.97       |    0.55    |      0.49       |
sorted +  10% end            |     5.73       |    1.32    |      1.40       |
                             |                |            |                 |
sorted + 0.1% middle         |     6.58       |    1.89    |      2.61       |
sorted +   1% middle         |     7.06       |    2.12    |      3.07       |
sorted +  10% middle         |     9.56       |    4.02    |      5.49       |
                             |                |            |                 |
reverse sorted               |     0.13       |    0.14    |      1.87       |
reverse sorted + 0.1% end    |     5.22       |    0.52    |      0.42       |
reverse sorted +   1% end    |     5.29       |    0.66    |      0.55       |
reverse sorted +  10% end    |     6.03       |    1.45    |      1.44       |
                             |                |            |                 |
reverse sorted + 0.1% middle |     6.52       |    1.89    |      2.54       |
reverse sorted +   1% middle |     7.09       |    2.12    |      3.09       |
reverse sorted +  10% middle |     9.46       |    4.02    |      5.53       |
                             |                |            |                 |
-----------------------------+----------------+------------+-----------------+

If you want detailed information about this algorithm you can find it in the flat_stable_sort_en.pdf document


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