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 destroy
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 processor 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 processor set. When you first create a processor
set, it does not contain any processors.
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 processor set.
Use the pset_destroy command or the destroy_pset function
to destroy a processor set. Processors that belong to a
destroyed processor set are assigned to the default processor
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
You must be root to create and destroy processor sets and
to assign a processor to a processor set. Processor set
creation and destruction and processor 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),
Functions: assign_pid_to_pset(3), assign_cpu_to_pset(3),
create_pset(3), destroy_pset(3) delim off
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