Statistics:
===========

     +------------------+--------------+--------------+---------+
     |                  | w/o mmap()   | with mmap()  |  gain   |
     +------------------+--------------+--------------+---------+
     | [common_1]       |    3.75 sec  |    3.72 sec  |  + 0.8% |
     | [heavy_duty_1]   |   16.16 sec  |   26.00 sec  |  -37.0% |
     | [joins_1]        |    3.00 sec  |    2.90 sec  |  + 3.4% |
     | [joins_2]        |    2.19 sec  |    2.47 sec  |  -11.3% |
     | [not_null_1]     |    2.87 sec  |    3.03 sec  |  - 5.2% |
     | [primary_key_1]  |    4.41 sec  |    4.40 sec  |  + 0.2% |
     | [primary_key_2]  |    3.66 sec  |    3.78 sec  |  - 3.2% |
     | [primary_key_3]  |    2.09 sec  |    2.18 sec  |  - 4.1% |
     | [primary_key_4]  |    2.22 sec  |    2.47 sec  |  -10.1% |
     | [primary_key_5]  |    2.03 sec  |    2.00 sec  |  + 1.5% |
     | [primary_key_6]  |    1.79 sec  |    2.35 sec  |  -23.8% |
     | [real_num_1]     |    2.13 sec  |    2.34 sec  |  - 9.0% |
     +------------------+--------------+--------------+---------+
     | -->       total: |   46.30 sec  |   57.64 sec  |  -19.7% |
     +------------------+--------------+--------------+---------+

        w/o mmap()      = direct I/O to disk
        with mmap()     = mmap() emulation

