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From "Bill Stoddard" <b...@wstoddard.com>
Subject Re: [PATCH] Switch to pthread as the default interprocess lock...
Date Mon, 24 Sep 2001 16:10:43 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
> > Solaris systems (above 4 way). pthread is much faster than fcntl on single CPU boxes,
> > 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.

Just occured to me that our measurements were on 1.3.  If you are seeing better
performance with pthread on an 8 way in threaded 2.0, then go for it. I do agree with jeff
that we should -not- adopt pthread by default on all platforms.

> 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?
Havenot seen this in 1.3. Haven't tested in 2.0.

> 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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