psrset —
control processor sets
  
    | psrset | -asetid
      cpuid ... | 
The psrset command can be used to control and inspect
  processor sets.
The system always contains at least one processor set: the default
    set. The default set must contain at least one online processor (CPU) at all
    times.
Available options:
  - -a
- Assign one or more processors (CPUs) to the set
      setid. In the current implementation, a CPU may only
      be present in one set. CPU IDs are as reported and used by the
      cpuctl(8) command.
- -b
- Bind one or more processes to the set setid. All
      LWPs within the processes will be affected. Bindings are inherited when
      new LWPs or processes are forked. However, setting a new binding on a
      parent process does not affect the bindings of its existing child
      processes.
- -c
- Create a new processor set. If successful, the ID of the new set will be
      printed. If a list of CPU IDs is provided, those CPUs will be assigned to
      the set upon creation. Otherwise, the set will be created empty.
- -d
- Delete the processor set specified by setid. Any
      LWPs bound to the set will be re-bound to the default processor set.
- -e
- Execute a command within the processor set specified by
      setid.
- -i
- List all processor sets. For each set, print the member CPUs. If
      psrsetis run without any options, it behaves as
      if-iwere given.
- -p
- List all CPUs. For each CPU, print the associated processor set.
- -r
- Remove a CPU from its current set, and return it back to the default
      processor set.
- -u
- Bind the specified processes to the system default processor set.
Thepsrset command first appeared in
  NetBSD 5.0.