gistfile1.txt

freeride:prgtst jester$ g++ -pthread -std=c++11 -O2 pipe.cpp
freeride:prgtst jester$ time ./a.out
Starting iteration.
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Ending iteration.

real	0m36.807s
user	0m7.564s
sys	0m29.534s
freeride:prgtst jester$ g++ -pthread -std=c++11 -O2 -DUSE_PIPES pipe.cpp
freeride:prgtst jester$ time ./a.out
Starting iteration.
On iteration 100000.
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Ending iteration.

real	0m7.086s
user	0m1.774s
sys	0m12.169s
freeride:prgtst jester$