Why the hell am I not allowed to use all my ram...

Ok, so my computer has 8GB of ram, and always have.
I have jdk & jre. (latest updates)
I try to use 2GB on ram and i get this....

Code:

Java HotSpot(TM) Client VM warning: Using incremental CMS is deprecated and will
likely be removed in a future release
Error occurred during initialization of VM
Could not reserve enough space for 2097152KB object heap
Press any key to continue . . .

Why in the world is it only letting me use 1GB and no more???...

Code:

java -Xincgc -Xms2G -jar craftbukkit-1.7.9-R0.2.jar -o true

 

Try this... java -Xms2048M -Xmx2048M -jar craftbukkit-1.7.9-R0.2.jar -o true
Double-check your OS is reporting the correct amount of memory.
(If on Windows)
Control Panel > System, see 'Installed Memory (RAM)'

 

Yeah 8Gigs on there.
And no it didnt help :/

Code:

Error occurred during initialization of VM
Could not reserve enough space for 2097152KB object heap
Press any key to continue . . .

 

I would try setting the max heap. -XX:MaxHeapSize=AMOUNTm.
Make sure to replace amount with the amount of maxheap you would like to have.

 

isleepzzz Are you using 32-bit or 64-bit Java?

 

Like Adam says check your bit version.
Overall I'd check your current version anyway, says its using a deprecating function which can indicate an old (Java) package.
Java version verify can check your version and look for out-of-date versions installed.