Why all PCs need 2GB RAM

Mem: 2065992k total, 1615628k used, 450364k free, 24k buffers
Swap: 5242872k total, 1118284k used, 4124588k free, 209792k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
22034 nic 20 0 2087m 803m 26m S 0 39.8 9:52.67 java
15540 nic 20 0 375m 206m 22m S 27 10.2 93:32.82 firefox-bin

And I'd just shut down Jetty... Grails programming in Eclipse