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https://issues.apache.org/jira/browse/JENA-902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14361913#comment-14361913
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Bruno P. Kinoshita commented on JENA-902:
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> Proposed is to lower the default settings
I will leave this one to the the others that will have a better background on
this default value.
> have a more exposed documentation as to tuning the memory settings of TDB.
We can probably add something in one of the [TDB
page|http://jena.apache.org/documentation/tdb/index.html] sub pages. My
suggestion is include somewhere in the [TDB configuration
page|http://jena.apache.org/documentation/tdb/configuration.html]. What do you
think? Would you be able to produce a patch, or maybe even some draft here?
> Default cache sizes too large / configurability should be more exposed
> ----------------------------------------------------------------------
>
> Key: JENA-902
> URL: https://issues.apache.org/jira/browse/JENA-902
> Project: Apache Jena
> Issue Type: Improvement
> Components: TDB
> Affects Versions: TDB 1.1.0
> Reporter: Jan De Beer
>
> In the class "com.hp.hpl.jena.tdb.sys.SystemTDB" there are two important
> cache size settings, namely "Node2NodeIdCacheSize" and
> "NodeId2NodeCacheSize". On a 64-bit platform, they default to 100000 and
> 500000 entries.
> In our setup of 5 TDB-backed graphs inside a single dataset, these default
> settings led to out-of-memory errors of the Fuseki server although setting
> the available heap memory to 3GB. It took some heap analysis to reveal that
> these two caches were the main memory consumers. Also, from the public
> documentation of Fuseki / TDB, it wasn't so obvious that their sizes can be
> configured. Only by looking into the source code, we found that one can use a
> TDB properties file to override the defaults.
> Proposed is to lower the default settings and have a more exposed
> documentation as to tuning the memory settings of TDB.
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