$ java -Xmx5g LineCount <approach> big.log   (round-robin, 3 rounds, fresh JVM each)
-- round 1
reader        lines=9,623,347 chars=990,376,717 time=1,334 ms  gc=18 collections / 21 ms  (-Xmx5120 MB)
reader64k     lines=9,623,347 chars=990,376,717 time=1,260 ms  gc=18 collections / 21 ms  (-Xmx5120 MB)
scanner       lines=9,623,347 chars=990,376,717 time=5,367 ms  gc=49 collections / 49 ms  (-Xmx5120 MB)
lines         lines=9,623,347 chars=990,376,717 time=1,311 ms  gc=18 collections / 24 ms  (-Xmx5120 MB)
readAllLines  lines=9,623,347 chars=990,376,717 time=2,892 ms  gc=23 collections / 1048 ms  (-Xmx5120 MB)
-- round 2
reader        lines=9,623,347 chars=990,376,717 time=1,216 ms  gc=19 collections / 20 ms  (-Xmx5120 MB)
reader64k     lines=9,623,347 chars=990,376,717 time=1,233 ms  gc=18 collections / 21 ms  (-Xmx5120 MB)
scanner       lines=9,623,347 chars=990,376,717 time=5,645 ms  gc=50 collections / 51 ms  (-Xmx5120 MB)
lines         lines=9,623,347 chars=990,376,717 time=1,341 ms  gc=17 collections / 26 ms  (-Xmx5120 MB)
readAllLines  lines=9,623,347 chars=990,376,717 time=2,788 ms  gc=23 collections / 955 ms  (-Xmx5120 MB)
-- round 3
reader        lines=9,623,347 chars=990,376,717 time=1,254 ms  gc=18 collections / 21 ms  (-Xmx5120 MB)
reader64k     lines=9,623,347 chars=990,376,717 time=1,325 ms  gc=18 collections / 21 ms  (-Xmx5120 MB)
scanner       lines=9,623,347 chars=990,376,717 time=5,300 ms  gc=49 collections / 45 ms  (-Xmx5120 MB)
lines         lines=9,623,347 chars=990,376,717 time=1,398 ms  gc=18 collections / 25 ms  (-Xmx5120 MB)
readAllLines  lines=9,623,347 chars=990,376,717 time=2,985 ms  gc=24 collections / 1236 ms  (-Xmx5120 MB)