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No, it defers to the implementation of the C runtime library malloc.

Though I wouldn't recommend it unless you are desperate, it is possible to change the "release memory to the OS" behaviour by building Perl using a custom malloc.

This has been discussed here many times before, see for example: Not able to release memory and How to return unused memory to OS?.

From my testing across a number of OSes, I would expect only Linux and Windows to return "large" blocks of memory back to the OS. I would be interested to learn what operating system the OP is running on.


In reply to Re^3: Memory is not released back to operating system by eyepopslikeamosquito
in thread Memory is not released back to operating system by bloonix

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