Dylan Hutchison created SYSTEMML-1834:
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Summary: Codegen plan enumeration: short-circuit costing by upper
bound
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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