TOP usage

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Command "top" can show how much resources each process uses.

Values

PID : Process ID

USER : Effective User ID

PR : Dynamic priority

NI : Nice value, also known as base priority

VIRT : Virtual Size of the task. This includes the size of process's executable binary, the data area and all the loaded shared libraries.

RES : The size of RAM currently consumed by the task. Swapped out portion of the task is not included.

SHR : Some memory areas could be shared between two or more task, this field reflects that shared areas. The example of shared area are shared library and SysV shared memory.

S : Task status

%CPU : The percentage of CPU time dedicated to run the task since the last top's screen update.

%MEM : The percentage of RAM currently consumed by the task.

TIME+ : The total CPU time the task has been used since it started. "+" sign means it is displayed with hundreth of a second granularity. By default, TIME/TIME+ doesn't account the CPU time used by the task's dead children.

COMMAND : Showing program names.


Source: http://www.linuxforums.org/articles/using-top-more-efficiently_89.html