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https://issues.apache.org/jira/browse/SYSTEMML-2482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16567381#comment-16567381
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Matthias Boehm commented on SYSTEMML-2482:
------------------------------------------

Could you please be more specific what issue you encountered and how it 
manifests itself as it's important to properly cleanup these lists; otherwise 
there are unnecessary evictions in the general case. In any case, we might need 
to adapt the cleanup logic in paramserv accordingly.

> Unexpected cleanup of list object
> ---------------------------------
>
>                 Key: SYSTEMML-2482
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2482
>             Project: SystemML
>          Issue Type: Bug
>            Reporter: LI Guobao
>            Priority: Major
>
> Some unexpected overhead occurred when running the 
> {{*testParamservASPEpochDisjointContiguous*}} in test 
> {{*org.apache.sysml.test.integration.functions.paramserv.ParamservSparkNNTest*}}.
>  It took more time to finish the test in the case that the output of 
> instruction is a list which will be cleaned up after the execution. However, 
> the matrices referenced by the list should be pinned to avoid being cleaned 
> up. And this issue is related to 
> [SYSTEMML-2481|https://issues.apache.org/jira/browse/SYSTEMML-2481] 



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