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Editorial Team
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Asked: 2026-06-08T02:29:22+00:00

Basically I run a minecraft server on a Centos 6.2 16GB system I boot

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Basically I run a minecraft server on a Centos 6.2 16GB system

I boot through rtoolkit to start my server, now I assigned it to use 12GB however it is using muc more than that and I do not know why.
I run this command to run the jar file:

java -Xmx30M -Xms30M -XX:MaxPermSize=40M -jar Minecraft_RKit.jar USER:PASS

That then runs the process with the command:

java -Xms12288M -Xmx12288M -Djline.terminal=jline.UnsupportedTerminal -jar /home/craftbukkit.jar nogui

Now if I look at my Webmin module I can see that it is using exactly 18025792 kB of RAM. Way more than I have assigned. This has subsequently lead to the process using so much memory that it just crashes the system.

I might be making a stupid error here, but I would really appreciate if anyone could shed some light on this situation.

Many thanks.

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1 Answer

  1. Editorial Team

    Few other memory consumers in JVM:

    • On 64-bit OS each thread needs at least a MiB of memory. 5 thousand threads (unlikely, but if this is a server) can will fill up the gap between 12 GiB of assigned heap and 17 GiB of used memory

    • Native code has its own heap

    • PermGen settings aren’t mentioned in your second command line

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