If you have a 100mb/s connection, by running 200 concurrent threads, you've effectively given each thread the equivalent of a dial-up connection.

If all the threads were doing active work (like downloading), I would have no problems. The problems arose when some servers time out on me. I must use long timeouts (at least 5 minutes), and I have to retry the operations with not too much of a delay. This is what I have tried to counter by running a larger number of threads (100 is the maximum for now).

That of using a sensible number of threads in a thread pool arrangement.

But then I cannot use LWP. In fact, I do use a thread pool at the moment, my worker threads can pick up any kind of work (LWP fetch or a database fetch). The current worker thread code is very straightforward because it blocks on all I/O. To do non-blocking I/O, I will have to process several work items simultaneously, making the process quite messy. But I understand I have to have to go that route.

In reply to Re^3: Sharing large data structures between threads by Anonymous Monk
in thread Sharing large data structures between threads by Anonymous Monk

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.