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.

"Well done is better than well said." - Benjamin Franklin

In reply to Re^5: Timing of garbage collection by flexvault
in thread Timing of garbage collection by dd-b

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