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C:\test>perl -E"say int( rand 100 ) for 1 .. 10e6" > 10e6(of100).dat

...
C:\test>timeit \perl64\bin\sort.exe -o sorted "10e6(of100).dat"
Took: 87.626558680 seconds

static void
mergefps (char **files, register int nfiles,
...
      /* If uniquified output is turned on, output only the first of
     an identical series of lines. */
      if (unique)