[JENA-1832] Increase default JVM heap setting.

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Done
• Affects Version/s: Jena 3.14.0
• Fix Version/s: Jena 3.15.0
• Component/s: Fuseki
• Assignee: Andy Seaborne
• Reporter: Andy Seaborne
• Created: 28/Jan/20 11:30
• Updated: 19/May/20 10:26
• Resolved: 29/Jan/20 20:24

Description

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.

Issue Links

• links to: GitHub Pull Request #683