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https://issues.apache.org/jira/browse/SYSTEMML-2166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-2166.
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Resolution: Fixed
Assignee: Matthias Boehm
Fix Version/s: SystemML 1.1
> Reversed print ordering after function inlining
> -----------------------------------------------
>
> Key: SYSTEMML-2166
> URL: https://issues.apache.org/jira/browse/SYSTEMML-2166
> Project: SystemML
> Issue Type: Bug
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Priority: Major
> Fix For: SystemML 1.1
>
>
> 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 tried 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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