Ah, so I assume you want to profile your program to see how much time it spends waiting for a lock? One way you could have a go at this, given that your profiling tools only reliably work on one process, is to run two instances of your server, but accessing the same DBM file. Of course, this assumes the locking is done externally from the program (for example with a lock file instead of a semaphore in shared memory or some such beastie).

Assuming this is the case, than you run one instance of your server and put load on it until it starts to slow down. You then run another instance, on a different port presumably, and limit that one to one connection only (either by connecting only once or putting limitations in the forking code, heck, even by not forking at all). You can then reliably profile that server's execution. As long as you generate load on the other server instance, and hence generate contention for the lock, you should get a reliable answer from this as to whether your program spends most of its time waiting for the lock.

CU
Robartes-

In reply to Re: Re: Re: Profiling a forking program by robartes
in thread Profiling a forking program by Tardis

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.