Dylan Hutchison created SYSTEMML-1834:

             Summary: Codegen plan enumeration: short-circuit costing by upper 
                 Key: SYSTEMML-1834
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1834
             Project: SystemML
          Issue Type: Improvement
          Components: Compiler
            Reporter: Dylan Hutchison
            Assignee: Dylan Hutchison
            Priority: Minor

An intensive step during codegen is enumerating alternative ways to fuse Hops 
together.  The search process during this step computes the cost of many 
alternative plans. We should speed up the search process by stopping the 
costing process early when a cost exceeds that of the best plan found so far 
(an upper bound on the best plan in the search space).

Measurements show that ~90% of costed plans can be stopped early, at least for 
the StratStats script. It is not clear how early the plans can be stopped, but 
there is a definite benefit in search time (in seconds).

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