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Are you anyhwere setting any variables to undef or taking it out of scope?
As you pointed out this is reference counting, thus there needs to be no reference so that it can be garbaged collected.
Unfortunately Perl is not as smart as for instance the CLR for .NET to find cyclic references.
One solution could be to refactor your code to work with more functions with local variables.

In reply to Re: How to return unused memory to OS? by weismat
in thread How to return unused memory to OS? by mihirjha

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    [shmem]: then in the root of your source tree run: ctags -R
    [shmem]: you get a file named tags where all symbols and the places where they are used are listed
    [Lady_Aleena]: geany may not support that.
    [shmem]: I see that there is a plugin geany-plugin- codenav
    [shmem]: maybe that supports ctags, check the documentation
    [Lady_Aleena]: I'd have to talk to a geany person to see.
    [Lady_Aleena]: Right now, I'm trying to decide whether I want to rewrite how variables are entered in the sub I'm working on.
    [shmem]: wait, what? you want that person to read the documentation for you?

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