The top command monitors the resource occupancy of a process

Here are the various types of memory:
Virt:virtual Memory Usage

1. The process "required" virtual memory size, including the library, code, data, etc. used by the process
2, if the process to apply for 100m of memory, but the actual use of only 10m, then it will grow 100m, rather than the actual use of the volume

Res:resident Memory Usage resident RAM

1. The memory size currently used by the process, but does not include swap out
2. Sharing with other processes
3, if the application of 100m of memory, the actual use of 10m, it only grows 10m, and virt opposite
4, about the memory consumption of the library, it only statistics the size of the loaded library file memory

The top command monitors the resource occupancy of a process