Hello Monks!
I want to convert a bash script to Perl which i know is very CPU and time consuming.
(it is sa-learn which gunzips old quarantined items and feeds it to spamassassin for spam relearning see end for details)

I read of Devel::DProf in another post, but since i know already which part of the script is worst, (its the whole thing :-)) this wont be useful here.

I am wondering if i could do:
Insert sleep some seconds in the loop?
Stop the script (and continue later if this is possible?) if CPU consumption is e.g. more than 30%
(So it would only run if the machine is nearly idle and wont interrupt the other users?)
How could i determine the cpu consumption like linux command sar (Package sysstat)?

What would you suggest, your thoughts?.
Thanks for your ideas in advance.

code of original bash script:
cat spamlearn_old.sh
#!/bin/sh
for f in `ls /var/lib/amavis/virusmails/spam*.gz`; do
  echo Learn Spam-Mails from File $f ...
    gzip -cd $f | sudo -u amavis -H sa-learn --spam --showdots;
    done

[download]
Update: I tried to start the script with a low nice priority, reniced it, but it wont help much, forgot this to mention ... /Update

In reply to Performance issues by matze77

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.