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LC_ALL=C sort -k1 big{1,2,3}.txt | awk -f tally-count.awk | LC_ALL=C s
+ort -k2nr >out.txt

...
LC_ALL=C parsort -k1 big{1,2,3}.txt | ./tally-count | LC_ALL=C parsort
+ -k2nr >out.txt

real time:  3.615 seconds

LC_ALL=C parsort -k1 big{1,2,3}.txt | awk -f tally-count.awk | LC_ALL=
+C parsort -k2nr >out.txt

...
LC_ALL=C parsort -k1 big{1,2,3}.txt | ./tally-count | LC_ALL=C parsort
+ -k2nr >out.txt

real time:  2.398 seconds

cat big{1,2,3}.txt | ./linux-q -tT "select c1, sum(c2) from - group by
+ c1 order by sum(c2) desc, c1" >out.txt

...
./linux-q -tT "select c1, sum(c2) from big[1-3].txt group by c1 order 
+by sum(c2) desc, c1" >out.txt

real time: 89.539 seconds

# Tally adjacent count fields of duplicate key names.

...
END {
   print key, sum
}

// -------------------------------------------------------------------
+---------
// tally-count.cpp
...

   return 0;
}