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Graham Fagg 25375759c3 arrgh. reduce could for very small message sizes and proc counts call a linear function
this was implemented using a chain (tree followed with pipeline) by setting the chain fanout to a factor of size etc but the chain datastructure was fixed in length and if exceeded the topo create returned a null which isn't helpfull in cid next function of comdup...
Anyway two fixes, first we do have a real linear function so changed the decision function and second altered the
topo chain create to force chain fanouts of less than 1 to 1 and fanouts bigger than max to max.
next check in will change chain to dynamically allocd array (reallocable) but we shouldn't ever use a chain fanout for a linear tree anyway. 
(lession must rerun all tests for all data sizes when changing decision functions)

This commit was SVN r8662.
2006-01-08 02:41:09 +00:00
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