Beefy Boxes and Bandwidth Generously Provided by pair Networks
XP is just a number
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

Actually you *may* need real recursion to do that. You don't have to return the list of files and can certainly process them on the fly. This will of course reduce the in memory array size by orders of magnitude depending on file:dir ratio.

However using this approach, which as you not works fine, you are basically stuck with an array listing *all* the dirs. There is a reason for this. Although it is safe to push while you iterate over an array it is not safe to shift AFAIK but I have not extensively tested that. The perl docs *do basically say* don't do *anything* while iterating over an array but it copes fine with push. This makes a certain degree of sense as all we are doing is adding to the end of a link list of pointers and incrementing the last index by 1 with each push. In the loop perl is obviously not caching the end of list pointer but must be rechecking each time.

If you shift then there is an issue. If you are looping from offset N and are at index I and you move N then.....

Anyway a gig of RAM will cope with ~5-10M+ dirs so it should not be a major issue unless you have very few files per dir.

As the search is width first you could easily batch it up into a series of sub searches based on 1-2 levels deep if you have serious terrabytes.

cheers

tachyon


In reply to Re: Re: Re: File::Find memory leak by tachyon
in thread File::Find memory leak by crabbdean

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • 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:
    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
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others making s'mores by the fire in the courtyard of the Monastery: (9)
    As of 2014-07-23 21:17 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My favorite superfluous repetitious redundant duplicative phrase is:









      Results (152 votes), past polls