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Posted to issues@systemml.apache.org by "Matthias Boehm (JIRA)" <ji...@apache.org> on 2017/11/16 07:44:00 UTC

[jira] [Created] (SYSTEMML-2017) Missing frame delete from buffer pool on rmvar, cpvar, etc

Matthias Boehm created SYSTEMML-2017:
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             Summary: Missing frame delete from buffer pool on rmvar, cpvar, etc
                 Key: SYSTEMML-2017
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2017
             Project: SystemML
          Issue Type: Bug
            Reporter: Matthias Boehm


A recent scenario with frame appends and casts in loops revealed a hidden buffer issues regarding frames. As it turned out, frames are never deleted on rmvar, cpvar or similar instructions which leads to shrinking buffer pool size, unnecessary GC and unnecessary evictions. At script level this issue manifests itself by fast early iterations, but a significant performance hit as soon as the buffer pool size is reached.



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