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$ NUM_THREADS=1  ./rtoa-pgatram-allinone2b t1.txt t1.txt t1.txt t1.txt
+ | cksum
do_it_all time    :    0.498 secs
...
$ 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=1  ./rtoa-pgatram-allinone2c t1.txt t1.txt t1.txt t1.txt
+ | cksum
do_it_all time    :    0.488 secs
...
$ NUM_THREADS=16 ./rtoa-pgatram-allinone2c t1.txt t1.txt t1.txt t1.txt
+ | cksum
do_it_all time    :    0.065 secs
737201628 75552000

// rtoa-pgatram-allinone2c.cpp. Crude allinone version.
//   based on rtoa-pgatram-allinone2.cpp https://perlmonks.org/?node_i
+d=11152186
...

   return 0;
}