So I got "java -Xmx1024M -Xms1024M -jar minecraft_server.jar nogui" from minecraft.net/download ; It made my server run faster, but not as fast as I would like it too.
It is completely vanilla, and I will be hosting an UHC in a week, with 15+ people.
When I change the "1024" to "2048" or more, it doesn't work...
"java -Xmx1024M -Xms1024M -jar minecraft_server.jar nogui"
That works, but I would like to dedicate more.
"java -Xmx2048M -Xms2048M -jar minecraft_server.jar nogui"
Quote from Babymercyjump
Error occurred during initialization of VM.
Could not reserve enough space for 20971528KB object heap.
you say you have a 64bit os, but do you have 64biyt java and is the java path calling it, ot the 32bit java you may still have installed?
the error you posted is looking to be an error 32bit java throws out when allocating more than 1.5GB