[PATCH] xenctld - a control channel multiplexing daemon

[Jared Rhine <jared@wordzoo.com>]

[Ronald == rminnich@lanl.gov on Mon, 24 Jan 2005 10:04:29 -0700 (MST)]

  Jared> Ron, is your performance concern because large clusters need
  Jared> to pass a very high volume of control messages?

  Ronald> re-reading this, however, I think my concerns about the
  Ronald> extra daemon shrink into insignificance when I think about
  Ronald> Python-based Xend ...

I think most people are agreed that a non-Python control
infrastructure will be developed in the not-so-distant future.  So
to the extent your concerns about multiple daemons apply in a
non-Python environment, they should be addressed.

  Ronald> The issue is that, in any large scale cluster, if you have
  Ronald> enough processes running besides your application on the
  Ronald> nodes, then the act of scheduling those processes -- even
  Ronald> for select calls that return instantly
  Ronald> -- can derange the application performance.

It may be that clustering people need a whole different toolset.  If
you were trying to minimize process count, then you probably wouldn't
even want xcs, a multiplexing switch anyway.  Indeed, why multiplex at
all?  You might use a single control mechanism, preferably combining
whatever subset of xcs, xensv, xm, etc you needed.

I'll leave it others to figure out what all this means for xcs's
future.

Thanks for your cluster scheduling overview; it was helpful.

-- jared@wordzoo.com

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