Charm++ parallel programming system

[Robert Steinke <rsteinke AT uwyo.edu>]

I've been having an intermittent problem where my code hangs.  I've 
traced down where it is happening.  The problem is with a reduction.  
Every array element calls contribute, but the reduction target never 
gets called.  It's intermittent, but when it happens it always happens 
on the first time the reduction is performed after load balancing.  It 
happens more often on larger numbers of processors.

What is the best way to debug this?  Can I look at what the Charm code 
thinks the state of the reduction is such as how many elements have 
contributed and how many are expected to contribute?  Is there a trace 
level option I should use, or is there somewhere in the .def.h code 
where I should stick a breakpoint?

thanks,
Bob Steinke