Problem dedicating more RAM to server

I have 8GB RAM and i can't add more than 1GB RAM!
config:
java -Xmx3G -jar craftbukkit.jar -o true
PAUSE

Error message:
E:\Pogramfiler\Servere\Mc server>java -Xmx3G -jar craftbukkit.jar -o true
Error occurred during initialization of VM
Could not reserve enough space for object heap
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

E:\Pogramfiler\Servere\Mc server>PAUSE
Press a keye to continue...

RAM:
I have 8gb, and almost 5gb free

 

Do you have a 32-bit windows computer? If yes, you can only have up to 1 gb D:
If you have 64-bit but 32-bit java, uninstall java and install 64-bit java.

 

josixx Also please send your batchfile command line.
Also try it in MB -Xmx3072

Emerdisk It shouldnt matter if he has 32 or 64-bit because we are not working with anymore than 3.9GB of RAM

 

saiismad823, read this
https://forums.bukkit.org/threads/bat-file-explained.602/

 

Emerdisk Sorry my mistake. I have never run a server on 32-bit architecture so I assumed it has the same restrictions as windows 32-bit OS's have.

 

No problem XD
I thought it was like that for 32-bit too before

 

#1 - Make sure your operating system is 64-bit. If not, you are outta luck and wasting all that extra RAM over 3GB (1GB is just for Windows). You can tell if you have a "C:\Program Files (x86)" folder.

#2 - Make sure you have a 64-bit version of Java installed. You can both 32-bit and 64-bit versions installed at the same time (and is even recommended).

#3 - Make sure you are calling the 64-bit version of Java in your batch file (because the 32-bit version is limited). The example below assume Java 1.7 which is what's currently recommended (not 1.6 or 1.8) and the current version is Oracle Java JRE 1.7.0 Update 65

start-server.bat

Code:

@ECHO OFF
CD /D C:\Craftbukkit\
"%ProgramFiles%\Java\jre7\bin\java.exe" -XX:MaxPermSize=128M -Xmx3096M -Xms3096M -jar craftbukkit.jar nogui

LHammonds

 

@LHammonds
I have a 64 bit pc and ran 32 bit Java, so i had to download 64 bit java and use your .bat config
Now the server runs with 3096 mb of ram
Thank you!
@Emerdisk
Thanks for the help