I feel like I'm missing something. Why would it take 52GB of memory to build a hash from 350MB of data? Does the hash overhead really take 150 times as much space as the data itself? I just wrote a little script that takes one of my httpd logs, splits each line on the first ", and uses those two sections as key and value of a hash. This log file is 27MB, and Devel::Size->total_size says the resulting hash is 38MB. That's 40% overhead, which seems much more reasonable, and would mean the original poster's 350MB might take up 500MB as a hash, still well within his limits.

Aaron B.
My Woefully Neglected Blog, where I occasionally mention Perl.

In reply to Re^5: Indexing two large text files by aaron_baugher
in thread Indexing two large text files by never_more

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!
  • 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, details, 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, summary, 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.