I think you should follow the advice given by McA above:

...you're using the backtick operator very often which creates a subprocess doing the shell command. This is expensive. You can do all the tasks directly in Perl reducing the amount of subprocess creations.

In particular, this line:

`perl -i -pe 's/[^[:ascii:]]//g; tr/\015//d' $abc1`;

[download]

creates a new shell subprocess with its own copy of the Perl interpreter on every loop iteration! Look at the answers already given by aitap and pvaldes, below, for advice on how to re-write your code in pure Perl, without using the backtick operator. There is no point in looking at other optimisations until you’ve removed the overhead of all those unnecessary shell subprocesses.

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

In reply to Re^5: Faster replacement of sed commands by Athanasius
in thread Faster replacement of sed commands.. by Ankur_kuls

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.