Hi ,

I have a file 1 with 300,000 patients , each row has the subject information and the first column is the subject ID. I need to sort this file based on a certain criterion using file2 where file 2 has the list of the subject ID. For example, if file 2 looks like 

Sub35
Sub71
Sub89
.
.

[download]

Then I have to go to file 1 , search for sub35 and print the record for sub35 and the following 2 subjects in file 1. then search for sub71 in file 1 and print out the record for sub71 and the 2 subjects following sub71 in file 1.

The way I wrote the script is as follows:

Loop through file 2 using while loop and get the subject number. Loop over file 1 from the beginning of the file to the end using a for loop, split each row and find the subject, then print out the line and the following two lines.

The problem with this approach is that the program took over 24 hours to run. Is there a way to cut the processing time?

Thanks for your help,

In reply to How to cut down the running time of my program? by kayj

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.