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Nevertheless I wouldn't allow a user to run something at nice -20. User processes should be in the range 0 to 19 to leave room for kernel tasks. As long as there are more cores than active processes all will run at maximum speed anyway (there are are no processes to be nice to in this case). And even if a machine is oversubscribed, the nice values are relative: e.g. whether all user processes have a nice value of 0 or all have a nice value of 19 wouldn't change anything for them.
What do you mean by “better”? As the name implies, it means to be nice to other processes. When there are none additional (user-) processes, there is noone to be nice to. With a negative value you could transcribe it with “cheecky”, as it might block important kernel tasks.
From a user experience on an otherwise empty machine, you shouldn't see any difference between nice 0 and nice 19 anyway.
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