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Linux Top Command Field Descriptions

Fields/Column Description
us user cpu time (or) % CPU time spent in user space
sy system cpu time (or) % CPU time spent in kernel space
ni user nice cpu time (or) % CPU time spent on low priority processes
id idle cpu time (or) % CPU time spent idle
wa io wait cpu time (or) % CPU time spent in wait (on disk)
hi hardware irq (or) % CPU time spent servicing/handling hardware interrupts
si software irq (or) % CPU time spent servicing/handling software interrupts
st steal time – – % CPU time in involuntary wait by virtual cpu while hypervisor is servicing another processor (or) % CPU time stolen from a virtual machine


Fields/Column Description
PID Process Id
USER The effective user name of the task’s owner
PR The priority of the task
NI The nice value of the task.  A negative nice value means higher priority, whereas a positive nice value means lower priority.  Zero in this field simply means priority will not be adjusted in determining a task’s dispatchability
%CPU The task’s share of the elapsed CPU time since the last screen update, expressed as a percentage of total CPU time.
%MEM A task’s currently used share of available physical memory
TIME+ Total CPU time the task has used since it started
S The status of the task which can be one of:
             ‘D’ = uninterruptible sleep
             ‘R’ = running
             ‘S’ = sleeping
             ‘T’ = traced or stopped
             ‘Z’ = zombie
RES The non-swapped physical memory a task has used
SHR The amount of shared memory used by a task
Command Display the command line used to start a task or the name of the associated program

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