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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-2234) Memory leak buffer pool due to missing variable cleanup
Date Thu, 05 Apr 2018 21:09:00 GMT
Matthias Boehm created SYSTEMML-2234:
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             Summary: Memory leak buffer pool due to missing variable cleanup
                 Key: SYSTEMML-2234
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2234
             Project: SystemML
          Issue Type: Task
            Reporter: Matthias Boehm


There are scenarios where variables are not properly cleaned up before assigning new matrices
to logical variable names. This missing cleanup leads to a memory leak in the buffer pool,
which in turn leads to unnecessary evictions and missing cleanup of FS and HDFS files.

After a closer investigation, this issue occurs for special cases of function calls that have
a peculiar control flow structure that prevents rmvar instructions for certain intermediates
and thus requires cleanup of these intermediates after the function call. Furthermore, a similar
issue occurs for loops with dedicated update-in place variables. 




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