Problem Server ram Issue

[Dondark]

So we got a server setup running just fine generally
But if you remove alot of water ect the server graph Spikes sometimes showing a solid beam
this ofc laggs the server but what i dont gett is why the server doesent eat up more ram then to deal with it

nomatter how stressed it is it never takes more ram and if it does its never enough

As the picture shows .. the server is VERY stressed at this point .. but its got LOADS of free ram to take up . but it never does .. can you change that ?

Im running a costum server launcher with the text

''
@echo off
java -Xms4096M -Xmx4096M -jar Minecraft_Server.jar gui
pause
''

 

[devryb]

I'd say that's more of a cpu constraint not ram. Removing lots of water would do that.

 

[Dondark]

cpu never goes above 30% load even when this happens .. but then again ive heard that these servers are not using all the cores . i just wish there was a way to make it run better . with all these resources avalible why would it not just take them

 

[Geech6]

I believe it's a Java limitation. Java only uses a single core at any given time. It will pass it around on a system between all the cores, but it will only use one.