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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (SYSTEMML-2166) Reversed print ordering after function inlining
Date Fri, 02 Mar 2018 03:16:00 GMT

     [ https://issues.apache.org/jira/browse/SYSTEMML-2166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matthias Boehm closed SYSTEMML-2166.
------------------------------------
       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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