beam.smp process takes more memory than rabbitmqctl status result

[kelvin]

Hi,

beam.smp process takes 5027M VIRT and 2.8G RES.
when using rabbitmqctl status command, it shows rabbitmq takes about 1.5G memory.
why the results are different and where is the rest memory using? how can I reduce that gag?
I'm running rabbitmq 3.3.5
and Erlang R14B04 (erts-5.8.5) [source] [64-bit] [smp:4:4] [rq:4] [async-threads:30] [kernel-poll:true].

Regards,
  kelvin.