Matthias Boehm created SYSTEMML-2166:
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Summary: Reversed print ordering after function inlining
Key: SYSTEMML-2166
URL: https://issues.apache.org/jira/browse/SYSTEMML-2166
Project: SystemML
Issue Type: Task
Reporter: Matthias Boehm
With SystemML 1.1 a number of new rewrites were introduced that merge sequences
of statement blocks which appear after branch removal and function inlining.
Although this greatly improves performance for certain workloads, it might lead
to a reordering of operations without dependencies (such as prints) that end up
in the consolidated DAG. SYSTEMML-2050 tries to address this by ordering of
prints by their line numbers. Unfortunately, this works only in certain
situations because after function lining the print line numbers do not
correspond with the order of the original function calls.
This task aims to resolve this behavior which might be confusing. There two
possible approaches: either (1) assign artificial line numbers or positions
during function lining and statement block merge, or (2) merge the DAG roots in
order to their sequence. The second approach seems more appropriate because it
also leaves the other operations in order, not just prints.
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