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Cpu(s): 25.6% us, 2.6% sy, 0.0% ni, 71.8% id, 0.0% wa, 0.0% hi, 0.0% si

us - Percentage of CPU time spent in user space.
sy - Percentage of CPU time spent in kernel space.
ni - Percentage of CPU time spent on low priority processes.
id - Percentage of CPU time spent idle.
wa - Percentage of CPU time spent in wait (on disk).
hi - Percentage of CPU time spent handling hardware interrupts.
si - Percentage of CPU time spent handling software interrupts.

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND

PID - The thread ID.
USER - The user ID of the user that started the process.
PR - The priority of the thread.
NI - The "nice" value for the process.
VIRT - The virtual memory (allocated) usage of the process.
RES - The resident memory (committed) usage of the process.
SHR - The shared memory usage of the process.
S - The state of the thread. This can be one of the following:
R - Running
S - Sleeping
D - Uninterpretable sleep
T - Traced
Z - Zombie
%CPU - The percentage of a single CPU usage by the thread.
%MEM - The percentage of the memory used by the process.
TIME+ - The amount of CPU time used by the thread.
COMMAND - The name of the process executable.
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