I just got done tracking down a nasty memory leak due to my use of natatime(). It's not a function I've ever used before but it seemed convenient enough.

Run this code and watch the memory use grow: 

use List::MoreUtils qw(natatime);

my $count = 0;
while (1) {
    my @rows = ("...") x 100;
    my $it = natatime(10,@rows);
    while(my @chunk = $it->()) {
        $count += @chunk;
        if ($count % 1000 == 0) {
            warn "COUNT : $count\n";
        }
    }
}

[download]

I haven't dug any deeper than this, so I'm not sure if it's something in List::MoreUtils XS code or a side-effect of using a closure for the iterator, or what. I'm also going to send this to the maintainer, so no need to remind me!

UPDATE: It would seem to be an XS bug - setting the environment var LIST_MOREUTILS_PP=1 makes it go away.

UPDATE 2: Corion asked, so I'll tell you - this is List::MoreUtils v0.22 on Perl v5.8.8. Oh, and the maintainer's email address doesn't work. Anybody want to take over and fix this?

-sam

In reply to Beware List::MoreUtils natatime()! by samtregar

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.