processor_sets - Collections of processors
A processor set is a collection of processors. When a processor set is
first created, it does not contain any processors. You can add processors
to a processor set, remove processors from a processor set, and also des-
troy the processor set. In addition, you can assign specific processes to
a processor set.
When the system is booted, all its processors are assigned to the default
processor set. Each processor in a system can be a member of only one pro-
cessor set at one time.
In addition, when you create a process, it is assigned to a processor set.
Unless you indicate a specific processor set, a process is assigned to the
default processor set. A process can execute only on an processor that is
included in the processor set to which the process is assigned. If you
assign a process to an empty processor set, it will not execute until a
processor is assigned to the processor set or until the process is assigned
to another processor set.
Use the pset_create command or the create_pset function to create a proces-
sor set. When you first create a processor set, it does not contain any
Use the pset_assign_cpu command or the assign_cpu_to_pset function to
assign processors to a specific processor set. When you assign a processor
to a specific processor set, the processor is removed from its current pro-
Use the pset_destroy command or the destroy_pset function to destroy a pro-
cessor set. Processors that belong to a destroyed processor set are
assigned to the default processor set.
Use the pset_assign_pid command or the assign_pid_to_pset function to
assign a process to a specific processor set. In addition, you can request
that a process has exclusive access to a processor set. If a process has
exclusive access to a processor set, no other process is able to use that
processor set. If a process has exclusive access to a processor set, that
access will be cleared automatically when the process exits. Note that if
a process is already assigned to a processor set, a request for exclusive
access to that processor set will be denied.
Use the pset_info command to display the status of each processor set on
the system as well as the status of each processor.
You must be root to create and destroy processor sets and to assign a pro-
cessor to a processor set. Processor set creation and destruction and pro-
cessor assignments to processor sets are logged in the /var/adm/wtmp file.
The following restrictions apply:
An error message is displayed if you try to move the primary processor to
another set. This is because the primary processor is always a member of
the default processor set.
When a halted processor is restarted, it is returned to membership of the
set from which it was halted. If that set no longer exists, it is returned
to the default set.
Commands: pset_create(1), pset_destroy(1), pset_info(1),
pset_assign_pid(1), pset_assign_cpu(1), runon(1), psrinfo(1), psradm(8)
Functions: assign_pid_to_pset(3), assign_cpu_to_pset(3), create_pset(3),