Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
This is an interesting thought, Anonymous.

I'm cautious of reinventing the wheel here, because I have very little wheel building experience. The Berkeley DB ought to be able to do what I want--assuming I use it correctly, and after tilly's pointers and tips, I suspect I'm using it a bit incorrectly (or just expecting magic where there is none). At this point my plan is to rethink the way I interact with the database to reduce the size of the objects stored and avoid "exists?read->parse->modify->join->write" for every parent entry. I believe most of my problem is with the parenthandling, in that each parent can potentially grow rather large and gets modified a lot.

Using tilly's ideas (and a couple that were pointed out to me in a chatterbox session, also with tilly) I'm going to use a database structure something like this:

$parentmd5 == $url $exists $number_of_children

$parentmd5:childnumber == $md5-pointer

$childmd5 == $url $exists $number_of_children

With this structure I will still have to update the parent entry to increment the number_of_children variable, but the entry will keep a fixed size (I suspect constant resizing is a hindrence) and an increment is cheaper than checking to see if the child is already in the list and appending it to a list of entries. I still have to address the check to see if the child already is in the list--which is where all of my troubles are coming in, as I don't know how to check to see if the child is already among the 'number_of_children' without polling through every child!

So, it all comes down to this: My biggest quandary is how to handle the parent->child relationship efficiently....


In reply to Re: Re: Performance quandary by SwellJoe
in thread Performance quandary by SwellJoe

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 perusing the Monastery: (4)
    As of 2014-07-24 04:57 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My favorite superfluous repetitious redundant duplicative phrase is:









      Results (157 votes), past polls