How much RAM/Memory needs Jenkins to build a Minecraftmod?

[Voidi]

I'm trying to setup a Jenkins server to build mods.

 

But builds fails with:

10:11:14 :decompileMcJava HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000770fa3000, 547803136, 0) failed; error='Nicht genügend Hauptspeicher verfügbar' (errno=12)
10:11:22 
10:11:22 #
10:11:22 # There is insufficient memory for the Java Runtime Environment to continue.
10:11:22 # Native memory allocation (mmap) failed to map 547803136 bytes for committing reserved memory.

I assume that i should set some Java Memory limits but which and where (for Jenkins or Gradle via GRADLE_OPTS)?

My Server has only 2 GiB of RAM, is this even enough to run this?

 

[Voidi]

Thanks! it works now.