perl bin/algorithm3.pl 4_294_967_296 --print >/dev/null Compute time : 3.279 sec perl bin/primesieve.pl 4_294_967_296 --print >/dev/null Compute time : 3.126 sec perl bin/primeutil.pl 4_294_967_296 --print >/dev/null Compute time : 3.279 sec perl -Mntheory=:all -E 'print_primes(2**32)' >/dev/null 8.149 user time perl -Mntheory=:all -E 'forprimes { say } 2**32' 80.9s user time primesieve -p1 2**32 >/dev/null 172.9s user time