Performance monitor

I have started coding a PostgreSQL performance monitor.  It will be like
top, but allow you to click on a backend to see additional information.

It will be written in Tcl/Tk.  I may ask to add something to 7.1 so when
a backend receives a special signal, it dumps a file in /tmp with some
backend status.  It would be done similar to how we handle Cancel
signals.

How do people feel about adding a single handler to 7.1?  Is it
something I can slip into the current CVS, or will it have to exist as a
patch to 7.1.  Seems it would be pretty isolated unless someone sends
the signal, but it is clearly a feature addition.

We don't really have any way of doing process monitoring except ps, so I
think this is needed.  I plan to have something done in the next week or
two.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 853-3000
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