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  1. Apr 19, 2002
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  7. Apr 16, 2002
    • Justin Erenkrantz's avatar
      Add warning message when selecting an experimental MPM. · 8460e2b7
      Justin Erenkrantz authored 
      While this message will scroll by without their reading it, we can
reasonably say that we warned them if they report errors.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94674 13f79535-47bb-0310-9956-ffa450edef68
      8460e2b7
    • Brian Pane's avatar
      Added support for the threadpool MPM · c6f9454b
      Brian Pane authored 
      
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94673 13f79535-47bb-0310-9956-ffa450edef68
      c6f9454b
    • Brian Pane's avatar
      Another experimental MPM derived from worker: · d23b8ff6
      Brian Pane authored 
      The threadpool MPM implements Aaron Bannert's "time-space tradeoff"
design managing idle workers.  Rather than putting accepted connections
into a queue, the threadpool MPM keeps idle worker threads in a stack.
Its dedicated listener thread retrieves an idle worker from the stack
before accepting a connection.  If there are no idle workers, the
listener blocks until a worker becomes available before doing an accept.

In many ways, threadpool is also a variant of leader/follower.  They
both maintain a stack of idle threads.  The difference is that threadpool
has a dedicated listener thread, and leader/follower rotates the listening
responsibility among its worker threads.  In my initial testing, the
leader/follower MPM performs very well on multiprocessor Solaris 8 when
listening on a single port, but poorly when listening on multiple ports.
(I don't know why this is happening.  What I've found so far is that
when you add a poll on the listen socket(s) before the accept in the
leader/follower MPM, all the socket-related syscalls in the httpd get
slower.  My hypothesis is that the thread scheduler is making an optimal
decision about where (on what CPU) to run the newly awakened thread if
its first syscall is an accept, and a nonoptimal decision if its first
syscall is a poll.)  The threadpool MPM performs better with multiple
listener ports, and in my testing so far it looks competitive with
leader/follower when running with a single listener.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94672 13f79535-47bb-0310-9956-ffa450edef68
      d23b8ff6