setpriority
setpriority WHICH,WHO,PRIORITY
Sets the current priority for a process, a process group, or a user. (See setpriority(2).) Raises an exception when used on a machine that doesn't implement setpriority(2).
Portability issues: setpriority in perlport.
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https://perldoc.perl.org/5.22.0/functions/setpriority.html