Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot

Comment on

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

I am using File::Find to process a directory hierarchy. Some of the files are symlinks that I must follow. What I want to do is randomise the processing order of the files, something like this:

use File::Find; use List::Util 'shuffle'; my $somedir = "."; sub handlefind {print $_,"\n";} find({ wanted => \&handlefind, preprocess=>\&shuffle,follow=>1 }, $somedir);

However, preprocess is a noop when follow symlinks is on. Could anyone suggest an alternative approach to meet my goal. Thank you very much for your help,


(first time poster)

PS if you are curious, this is part of perl script that is run > 100x on a cluster to process 1000s of 3d brain images. I use simple file locks to make sure that only one job is running on any image. Unfortunately file locking on NFS is not very reliable (and I am already taking precautions). What happens is that if I start 100x jobs at once everyone tries to grab the same file and it's a mess. So I want to scramble the processing order of files to reduce the number of possible collisions to put less pressure on the file locking mechanism.

In reply to randomising file order returned by File::Find by jefferis

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!
  • 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:
    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
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            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?

    What's my password?
    Create A New User
    [choroba]: 20 months? :-o
    [Discipulus]: up to 20 months.. but you'll be sure to remain unemployed

    How do I use this? | Other CB clients
    Other Users?
    Others cooling their heels in the Monastery: (8)
    As of 2018-05-23 21:01 GMT
    Find Nodes?
      Voting Booth?