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Changing the priority of processes
Processes on a Linux system can be run with an altered priority, giving some 
processes more priority and others less. This gives you, the administrator, full reign 
when it comes to ensuring that the most important processes on the system are 
running with an adequate level of prioritization. There are dedicated commands for 
this purpose: 
nice
 and 
renice
. These commands allow you to launch a process with 
a specific priority, or change the priority of a process that's already running.
Nowadays, manually editing the priority of a process is something administrators 
will find themselves doing less often than they used to. A processor with 32 cores 
(or many more) is not all that uncommon, and neither is hundreds of gigabytes of 
RAM. Servers nowadays are certainly more powerful than they used to be, and are 
nowhere near as resource-starved as machines of old. Many servers (such as virtual 
machines) and containers are dedicated to a single task, so process tuning may not be 
of extreme value anymore. However, data processing firms and companies utilizing 
deep learning functions may find themselves needing to fine-tune some things.
Regardless of whether or not prioritizing processes is something that will be 
immediately useful to you, it's a good idea to at least understand the concept just in 
case you do find yourself needing to increase or decrease the priority of a process 
some day. Let's revisit the 
ps
 command, this time with the 
-l
 argument:
ps -l

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Controlling and Managing Processes