Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
It depends on exactly the inisialisation the children have to do. If the children have to make a database connection then you'll want to prefork them as in the second option. If the children should just be clones of the parent (ie can start work immediately after forking) then the first would be most appropriate.

That said just in just about any serious application you'll want to do some initialisation in the children so you'll want to prefork them, and to keep them alive for maximum speed.

You should make sure your children don't live forever though so that any memory can be reclaimed and they can go back to sharing all their pages with the parent. Maybe they should die after 100 uses or 60 minutes.

This is exactly how apache works - preforking its children and then they kill themselves after a set time. However apache keeps a dynamic number of children depending on the work load - a minimum number up to a maximum number.

Top tip: Don't use signals in the parent to catch SIGCHLD (as demonstrated in The Perl Cookbook) otherwise you'll miss some of your children dieing, just use wait. Set in non-blocking if you must but you want to try to do the absolute minimum in the parent so it is always alive to spawn more children.


In reply to Re: Have children maintain themselves or main script maintain children. by ncw
in thread Have children maintain themselves or main script maintain children. by the_0ne

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, 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
  • 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.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Domain Nodelet?
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this?Last hourOther CB clients
    Other Users?
    Others having a coffee break in the Monastery: (3)
    As of 2024-07-19 18:11 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      No recent polls found

      Notices?
      erzuuli‥ 🛈The London Perl and Raku Workshop takes place on 26th Oct 2024. If your company depends on Perl, please consider sponsoring and/or attending.