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Posted to dev@jena.apache.org by "Andy Seaborne (Jira)" <ji...@apache.org> on 2020/01/28 11:31:00 UTC

[jira] [Created] (JENA-1832) Increase default JVM heap setting.

Andy Seaborne created JENA-1832:
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             Summary: Increase default JVM heap setting.
                 Key: JENA-1832
                 URL: https://issues.apache.org/jira/browse/JENA-1832
             Project: Apache Jena
          Issue Type: Improvement
          Components: Fuseki
    Affects Versions: Jena 3.14.0
            Reporter: Andy Seaborne
            Assignee: Andy Seaborne
             Fix For: Jena 3.15.0


The script default is {{-Xmx1200M}} which is quite small these days (we can ignore 32-bit setups in choosing defaults).

We could simply leave it to the JVM default (25% of RAM).

Considerations:
* we don't want to squeeze out memory mapped files.
* 25% is a lot on larger servers if shared.

For TDB1/TDB2, a key use of memory in heap is the node table cache.
Other than that, it is intermediate query processing space.





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