Re: OSDLab projectL Accept() locking on large (6+ CPU) boxes

[Brian Pane]

Aaron Bannert wrote:

[...]

>The hard part about this (at least for me) is the multitude of variables
>that go in to deciding the implementation of the accept() mutex. Is there
>a way I can find out (at runtime) what implementation is being used?
>
If you're willing to use external instrumentation (as opposed to having
the httpd deduce the mechanism by itself at runtime), you can figure out
the accept serialization method with truss.  (The -l arg to truss, if I
remember correctly, will show the LWP ID for each syscall, so you can
look for the last syscall that each LWP does before accept.)

--Brian