Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation
 
PerlMonks  

Comment on

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

I have need to process a directory full of text files. It worked fine up to its planned limit of around 3000 files, but it's been too successful and the client now has 17,000 files in there!

The code currenlty looks like this

foreach$file(<directory/*.txt>) { do stuff }

Even if "do stuff" is merely to count them - or even just give the name of the first one and then exit; the process takes forever and often times out. (This is under Apache / Linux.) I assume the problem is that Perl(? or the OS?) has to read the entire directory listing into memory in order to structure the loop.

My thought is to restructure the directory into, say, 100 subdirectories and then process thus:

foreach$subdir(<directory/*>) { foreach$file(<$subdir/*.txt>) { do stuff } }

Will that help? My thought is that only two arrays will be created at any one time, one of 100 subdirectories and one of 170 files in the current subdirectory?

Or is there a much better way to do this?

BTW, the client tells me they hope to have 50,000 files in there soon...


In reply to Efficient processing of large directory by Elliott

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 studying the Monastery: (9)
    As of 2014-09-15 04:44 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My favorite cookbook is:










      Results (145 votes), past polls