Beefy Boxes and Bandwidth Generously Provided by pair Networks Russ
Syntactic Confectionery Delight
 
PerlMonks  

Comment on

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

Could you give us more information about what processing you are going to do?

For example:

  • Will you use each triplet of data (c1,c2,p) in isolation?
  • Or do you need all the triplets from a given pair of strings all together?
  • Or do you need the triplets from different pairs of strings together?

The reason for these questions is that whether done in Perl or C allocating the memory in which to build the list of positions is a substantial part of the overall cost. If you only need each position in isolation, then an iterator interface might be more efficient to use.

Equally, are the pairs of strings you are comparing the same length? Or are you comparing short strings with (every?) substring of a large strings? Are you comparing many short strings against (every) substring of larger strings?

The problem is that the basic mechanics of comparing the characters in two string is very fast. Especially in C. But the details of the code that surrounds that can have a big impact on the overall application time.

Rather than an extended to'n'fro of questions, it would be easier if you posted code or pseudo-code of the actual application, along with numbers and sizes of the strings involved.


Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^3: Fast Identification Of String Difference by BrowserUk
in thread Fast Identification Of String Difference by neversaint

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: (8)
    As of 2014-04-16 05:46 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      April first is:







      Results (414 votes), past polls