1e7:
serial 15.311s 1 core
parallel 7.898s 2 cores
parallel 4.229s 4 cores
parallel 2.244s 8 cores
parallel 1.265s 16 cores
parallel 0.815s 32 cores
1e8:
serial 2m38.645s 1 core
parallel 11.779s 32 cores before: serial qsorti
parallel 6.652s 32 cores after : parallel qsorti
parallel 2.656s 32 cores non-PDL solution
parallel 1.644s 32 cores non-PDL solution with Inline::C
https://perlmonks.org/?node_id=11115780
Collatz(63728127) has sequence length of 950 steps
Collatz(95592191) has sequence length of 948 steps
Collatz(96883183) has sequence length of 811 steps
Collatz(86010015) has sequence length of 798 steps
Collatz(98110761) has sequence length of 749 steps
Collatz(73583070) has sequence length of 746 steps
Collatz(73583071) has sequence length of 746 steps
Collatz(36791535) has sequence length of 745 steps
Collatz(55187303) has sequence length of 743 steps
Collatz(56924955) has sequence length of 743 steps
Collatz(82780955) has sequence length of 741 steps
Collatz(85387433) has sequence length of 741 steps
Collatz(63101607) has sequence length of 738 steps
Collatz(64040575) has sequence length of 738 steps
Collatz(93128574) has sequence length of 736 steps
Collatz(93128575) has sequence length of 736 steps
Collatz(94652411) has sequence length of 736 steps
Collatz(96060863) has sequence length of 736 steps
Collatz(46564287) has sequence length of 735 steps
Collatz(69846431) has sequence length of 733 steps