$ NUM_THREADS=1  ./rtoa-pgatram-allinone2b t1.txt t1.txt t1.txt t1.txt | cksum
do_it_all time    :    0.498 secs
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$ NUM_THREADS=4  ./rtoa-pgatram-allinone2b t1.txt t1.txt t1.txt t1.txt | cksum
do_it_all time    :    0.176 secs
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$ NUM_THREADS=8  ./rtoa-pgatram-allinone2b t1.txt t1.txt t1.txt t1.txt | cksum
do_it_all time    :    0.124 secs
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$ NUM_THREADS=16 ./rtoa-pgatram-allinone2b t1.txt t1.txt t1.txt t1.txt | cksum
do_it_all time    :    0.096 secs
737201628 75552000

$ NUM_THREADS=24 ./rtoa-pgatram-allinone2b t1.txt t1.txt t1.txt t1.txt | cksum
do_it_all time    :    0.090 secs
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$ NUM_THREADS=32 ./rtoa-pgatram-allinone2b t1.txt t1.txt t1.txt t1.txt | cksum
do_it_all time    :    0.122 secs
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$ time NUM_THREADS=24 ./rtoa-pgatram-allinone2b t1.txt t1.txt t1.txt t1.txt | cksum
do_it_all time    :    0.090 secs
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real    0m0.093s
user    0m1.858s
sys     0m0.103s