CountZero,
Once Perl has claimed the memory from the OS it will not be returned to the OS' pool.

Really? I have seen Perl give memory back on Windows. I haven't really checked on any other OSes, but I have read:

Cheers - L~R

In reply to Re^2: How to return unused memory to OS? by Limbic~Region
in thread How to return unused memory to OS? by mihirjha

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