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cp big1.txt big4.txt
cp big2.txt big5.txt
...
cp big1.txt bigs.txt
cp big2.txt bigt.txt
cp big3.txt bigu.txt

$ g++ -o llil4vec-omp -std=c++20 -fopenmp -Wall -O3 llil4vec.cpp -I./f
+ast_io/include

...
real  0m3.271s   <-- total wall time, performs similarly
user  0m16.823s  <-- nothing unusual, fans seem quiet
sys   0m4.188s

$ clang++ -o llil4vec-omp -std=c++20 -fopenmp -Wall -O3 llil4vec.cpp -
+I./fast_io/include

...
real  0m3.201s   <-- total wall time, performs similarly
user  0m45.889s  <-- system fans noticeably louder
sys   0m5.934s

$ time ~/j904/bin/jconsole llil4_p.ijs big?.txt out.txt

...
real  0m7.934s   <-- total wall time
user  0m24.782s  <-- this too, system fans roaring
sys   0m26.764s  <-- because user and sys combined