The original added 100 1Mbyte strings to @a.
Your example adds 50 * 10 = 500 1Mbyte strings to @a.
Also, each thread will create a 1Mbyte private scalar;
the original only created a single big string.
(The lack of locks is a bit troubling, but the aforementioned
global interpretter lock is probably keeping your example out
Perl Contrarian & SQL fanboy
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