Thank you for the example. However, I still have doubts. Please carefully consider this reply, my other reply, and BrowserUk's comments.
Red flag for me: Your second script, you claim takes "HOURS" to run. On the below mentioned old system, that script completes for me in minutes. Process memory usage never went above 50MB.
$ time perl script.pl
You're trying to create 100000 threads. You invite a race condition where your script may hit a wall very quickly if your threads do anything non-trivial. You would expect to see:
Thread creation failed: pthread_create returned 11 at script line 4.
Can't call method "detach" on an undefined value at script line 5.
Your first example will "leak" memory in the sense that the @thr_ll array will grow to 100000, even after threads exit. On most systems this wouldn't be a big deal if your real application caps at 100000 as well, but I still wouldn't recommend it.
I ran both of your scripts on my oldest machine, and neither one had a deleterious effect on Perl 5.10.1 on Ubuntu, running on an 8 year old P4-1.6GHz machine with 512MB. Both ran to completion.
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