[jkreps@jkreps-ld valencia]$ java -XX:+UseConcMarkSweepGC -cp target/test-classes -server -Xmx1G -Xms1G valencia.TestLinearWritePerformance $((256*1024)) $((1*1024*1024*1024)) 2
              file_length              size (bytes)              raf (mb/sec)   channel_direct (mb/sec)      mmap_direct (mb/sec)     channel_heap (mb/sec)        mmap_heap (mb/sec)
                  1000000                         1                       0.60                      0.52                     28.66                      0.55                     50.40
                  2000000                         2                       1.18                      1.16                     67.84                      1.13                     74.17
                  4000000                         4                       2.33                      2.26                    121.52                      2.23                    122.14
                  8000000                         8                       4.72                      4.51                    228.39                      4.41                    175.20
                 16000000                        16                       9.25                      8.96                    393.24                      8.88                    314.11
                 32000000                        32                      18.43                     17.93                    601.83                     17.28                    482.25
                 64000000                        64                      36.25                     35.21                    799.98                     34.39                    680.39
                128000000                       128                      69.80                     67.52                    963.30                     66.21                    870.82
                256000000                       256                     134.24                    129.25                   1064.13                    129.01                   1014.00
                512000000                       512                     247.38                    238.24                   1124.71                    235.57                   1091.81
               1024000000                      1024                     420.42                    411.43                   1170.94                    406.57                   1138.80
               1073741824                      2048                     671.93                    658.96                   1133.63                    650.39                   1151.81
               1073741824                      4096                    1007.84                    989.88                   1165.60                    976.10                   1158.49
               1073741824                      8192                    1137.12                   1145.01                   1189.38                   1128.30                   1174.66
               1073741824                     16384                    1172.63                   1228.33                   1192.19                   1206.58                   1156.37
               1073741824                     32768                    1221.13                   1295.37                   1170.96                   1262.28                   1156.65
               1073741824                     65536                    1255.23                   1306.33                   1160.22                   1268.24                   1142.52
               1073741824                    131072                    1240.65                   1292.06                   1101.90                   1269.00                   1119.14