Thanks paulbort!

SysInternals has a tool called "contig" that was close enough that with a little Perl, I could make it Do The Right Thing.

contig reports the number of fragments that comprise each file in a directory. It's normal output was surprisingly unreliable-- it skipped files apparently randomly sometimes-- but the verbose output seems to be more consistent. Also, it doesn't run continuously. In order to get a picture of fragmentation over time, the user has to run contig manually over and over.

So I wrote a little controller script in Perl that runs contig every 5 seconds in verbose/recursive/analyze mode, parses the output, and writes the interesting parts to an output file. Here's the script: 

use warnings;
use strict;

open OUT, ">out.txt";

while (1) {
    $| = 1; 
    my @out = qx/contig.exe -a -s -v *"/;
    foreach my $line(@out) {
        if ($line =~ "is in") {
            print OUT $line; 
        }
    }
    sleep 5;
    print OUT "\n";

[download]


I was pleasantly surprised to find that @out actually contained what I wanted it to. Made parsing the output really easy.

In reply to Solved! Re: Re: measure Win32 disk fragmentation with Perl? by McMahon
in thread measure Win32 disk fragmentation with Perl? by McMahon

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.