undef'ing the array will throw it up and delete any otherwise unreferenced things in the array, or the arrays in the array. This won't take a noticeable amount of time except in the most extraordinary of circumstances. (Like everything in the array of arrays has been swapped out to disk and needs to be paged back in to alter reference counts)
The memory may or may not be released back to the system--that depends mainly on the size of any one array, but generally not. On many systems you need to get into the megabyte allocation range (which means one element that's multi-megabytes in size, or an array of millions of elements) for this to happen, but some operating systems and C memory allocation libraries are more aggressive than others in returning memory to the system.
Making this a my variable and letting it fall out of scope will release all the memory except for the memory taken by the structure (but not the contents) of the my'd variable. So a multi-million element array falling out of scope will release its contents, but the structure of the array itself will remain. (This is one of the space/speed tradeoffs that perl makes)
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||