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From Peter Klügl (JIRA) <...@uima.apache.org>
Subject [jira] [Assigned] (UIMA-5306) Memory Improvement - Unnecessary leaks
Date Fri, 10 Feb 2017 08:56:41 GMT

     [ https://issues.apache.org/jira/browse/UIMA-5306?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Peter Klügl reassigned UIMA-5306:
---------------------------------

    Assignee: Peter Klügl

> Memory Improvement - Unnecessary leaks
> --------------------------------------
>
>                 Key: UIMA-5306
>                 URL: https://issues.apache.org/jira/browse/UIMA-5306
>             Project: UIMA
>          Issue Type: Improvement
>          Components: Ruta
>    Affects Versions: 2.3
>         Environment: Windows 10, JVM with -Xmx 1024, Java JDK 1.8., 16gb memory
>            Reporter: Dennis Bauer
>            Assignee: Peter Klügl
>
> In a productive setup we figured out, that there is a huge memory usage of Ruta itself.
With JVisualVM it's easy to see, that there is a relative small amount of arrays of Arraylists
but with a high memory consumption (250k instances result in 243 000 000 byte memory that
are reserved)
> The problem is, that in a clustered SaaS environment with less memory, these arrays block
relevant space in memory. A deeper look into these Arrays of Arraylist let suggest the class
org.apache.uima.ruta.type.RutaBasic
> A look at this class show three arrays that are instanced with the max. possible value,
that can be returned by the typesystem of CAS. 
> {code:Java}
>   private int[] partOf = new int[((TypeSystemImpl) getCAS().getTypeSystem()).getLargestTypeCode()];
>   private Collection<?>[] beginMap = new ArrayList<?>[((TypeSystemImpl) getCAS().getTypeSystem())
>           .getLargestTypeCode()];
>   private Collection<?>[] endMap = new ArrayList<?>[((TypeSystemImpl) getCAS().getTypeSystem())
>           .getLargestTypeCode()];
> 		  
> {code}
> In this improvement should be done an dynamic allocation of memory usage for these arrays,
so the total memory consumption would be reduced.



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