Update JVM arguments for memory tuning in Dockerfile

[guycst]

No description provided.

[guycst]

added -XX:InitialRAMPercentage=50.0 -XX:MaxRAMPercentage=80.

[guycst]

-XX:+UseContainerSupport can also be used to inform Java that it is running under a container

[srosset81]

Thanks @guycst !
Can you tell us more about this setting ? Does it mean Fuseki will use, at most, 80% of the RAM available ?

[srosset81]

Could you replace this now-unused ENV var with two vars (initial & max percentage), so that users of the Docker image can fine-tune it according to their needs ?

[guycst]

MaxRAMPercentage parameter allows setting the maximum heap size for a JVM running with a large amount of memory (greater than 200 MB).

The MinRAMPercentage parameter, unlike its name, allows setting the maximum heap size for a JVM running with a small amount of memory (less than 200MB).

[srosset81]

-XX:+UseContainerSupport can also be used to inform Java that it is running under a container

Sounds like a good option to add !