Re: [Xen-devel] [PATCH] xenctld - a control channel multiplexing daemon

["Ronald G. Minnich" <rminnich@xxxxxxxx>]

On Fri, 21 Jan 2005, Jared Rhine wrote:

> I prefer to instead keep the _function_ of daemons to a minimum, and run
> as many purpose-built, lightweight daemons as needed to build the
> functionality I want.

I understand the preference from an esthetics point of view. From a
quantitative performance point of view, in an environment where you want
to minimize the activity that is running on a lightweight cluster node, it
has been shown that 1 is better than 2.

So, all other things being equal, if we can have 1 daemon with TCP sockets 
instead of a daemon with unix domain sockets and a daemon that turns that 
into TCP sockets, on a reasonably large cluster (1024 or more nodes) 
you're much better off with 1 daemon. 1024 node clusters are not uncommon 
these days.

Again, this is not an issue of esthetics, it's an issue of measured 
performance. 

ron


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