http://www.perlmonks.org?node_id=1014213


in reply to Re^4: Timing of garbage collection
in thread Timing of garbage collection

Under Debian Linux the real memory was returned to the system, but under AIX 5.2, the real memory increased after the 'undef $x;'. I used 

    `ps -o "rssize" -p $$`

[download]

to determine the real memory used. So it looks like it is system dependent code as zwon pointed out.

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In Section Seekers of Perl Wisdom