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From Justin Erenkrantz <jerenkra...@ebuilt.com>
Subject Re: [PATCH] Switch to pthread as the default interprocess lock...
Date Mon, 24 Sep 2001 15:52:48 GMT
On Mon, Sep 24, 2001 at 11:00:31AM -0400, Bill Stoddard wrote:
> >From what I have seen, pthread accept serialization does not scale well on multi
CPU
> Solaris systems (above 4 way). pthread is much faster than fcntl on single CPU boxes,
but
> much slower than fcntl on a 12 way box.

On Ian's 8-way box, pthread was faster - causing a ~60rps improvement 
in httpd just from switching the lock type via AcceptMutex.

If you guys have access to a 12-way box, could you grab the current
code and see if 12 CPUs is still much slower?  Ian's seems to be
the current high end of what anyone has access to.  If no one
has access to a 12-way box and we know it is noticably better
at least up to 8 CPUs, I have no problem justifying that is the
default configuration on Solaris.

fcntl() on a 2-way Sol8 box here caused the httpd children to exit 
at high load - I'm not sure if Ian saw this or not.  Have you guys 
seen such a situation?  I detailed what I saw in STATUS.  I'm leery
of seeing the default cause httpd to exit at high loads.  -- justin


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