TwoKeySortDisk1.pl (extracts keys/offset/length and writes to file)
Starting RAM:  2.74GB
  Start Time:  05:03:13
    Peak RAM:  2.78GB
 Ending Time:  05:03:32

      Run Time:  19 sec
Peak RAM Usage:  0.04GB * 1024 = 40MB

Sort (probably Cygwin, not Windows native)
Starting RAM:  2.75GB
  Start Time:  05:04:39
    Peak RAM:  3.02GB
 Ending Time:  05:04:49

      Run Time:  10 sec
Peak RAM Usage:  0.27GB * 1024 = 276MB

TwoKeySortDisk2.pl (reads sorted keys, reads original file in random mode, writes output text file)
Starting RAM:  2.73GB
  Start Time:  05:07:56
    Peak RAM:  2.82GB
 Ending Time:  05:08:45

      Run Time:  49 sec
Peak RAM Usage:  0.09GB * 1024 = 92MB