Aaron Bannert wrote:
>Hi Dirk,
>
>I realize that the OSDlab is [primarily] linux machines, but something
>that you might want to look into on Solaris with larger-parallel
>machines is the pthread_setconcurrency() call, which AFAIK is not
>being called anywhere in httpd or apr.
>
>I quoth from the (Solaris 5.8) man page:
>
> Unbound threads in a process may or may not be required to
> be simultaneously active. By default, the threads implemen-
> tation ensures that a sufficient number of threads are
> active so that the process can continue to make progress.
> While this conserves system resources, it may not produce
> the most effective level of concurrency.
>
>
>My interpretation of this is that by default on solaris, pthreads remain
>a wholly userspace entity (ie they multiplex one LWP) unless we give a
>hint to the OS for how many LWPs we'd like to be able to assign to our
>userspace threads.
>
Are you able to observe this effect experimentally too? E.g., if
you run the threaded MPM on Solaris, does it use just one LWP per
process?
--Brian
