System Administration Commands pbind(1M)
NAME
pbind - control and query bindings of processes or LWPs
SYNOPSIS
pbind -b processorid pid [/lwpid]...
pbind [-q] [pid [/lwpid]...
pbind -Q [processorid]...
pbind -u pid [/lwpid]...
pbind -U [processorid]...
DESCRIPTION
pbind controls and queries bindings of processes and LWPs
(lightweight processes) to processors. pbind can also remove
processor bindings that were previously established.
When an LWP is bound to a processor, it will be executed
only by that processor except when the LWP requires a
resource that is provided only by another processor. The
binding is not exclusive, that is, the processor is free to
execute other LWPs as well.
Bindings are inherited, so new LWPs and processes created by
a bound LWP will have the same binding. Binding an interac-
tive shell to a processor, for example, binds all commands
executed by the shell.
Superusers may bind or unbind any process or LWP, while
other users can bind or unbind any process or LWP for which
they have permission to signal, that is, any process that
has the same effective user ID as the user.
OPTIONS
The following options are supported:
-b processorid
Binds all or a subset of the LWPs of the specified
processes to the processor processorid. Specify
processorid as the processor ID of the processor to be
controlled or queried. processorid must be present and
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System Administration Commands pbind(1M)
on-line. Use the psrinfo command to determine whether or
not processorid is present and on-line. See
psrinfo(1M).
-q
Displays the bindings of the specified processes or of
all processes. If a process is composed of multiple LWPs
which have different bindings and the LWPs are not
explicitly specified, the bindings of only one of the
bound LWPs will be displayed. The bindings of a subset
of LWPs can be displayed by appending "/lwpids" to the
process IDs. Multiple LWPs may be selected using "-" and
"," delimiters. See EXAMPLES.
-Q
Displays the LWPs bound to the specified list of proces-
sors, or all LWPs with processor bindings. For processes
composed of multiple LWPs, the bindings of individual
LWPs will be displayed.
-u
Removes the bindings of all or a subset of the LWPs of
the specified processes, allowing them to be executed on
any on-line processor.
-U
Removes the bindings of all LWPs bound to the specified
list of processors, or to any processor if no argument
is specified.
OPERANDS
The following operands are supported:
pid
The process ID of the process to be controlled or
queried.
lwpid
The set of LWP IDs of the specified process to be con-
trolled or queried. The syntax for selecting LWP IDs is
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System Administration Commands pbind(1M)
as follows:
2,3,4-8 LWP IDs 2, 3, and 4 through 8
-4 LWPs whose IDs are 4 or below
4- LWPs whose IDs are 4 or above
processorid
The processor ID of the processor to be controlled or
queried.
EXAMPLES
Example 1 Binding Processes
The following example binds processes 204 and 223 to proces-
sor 2:
example% pbind -b 2 204 223
process id 204: was 2, now 2
process id 223: was 3, now 2
Example 2 Unbinding a Process
The following example unbinds process 204:
example% pbind -u 204
Example 3 Querying Bindings
The following example queries bindings. It demonstrates that
process 1 is bound to processor 0, process 149 has at least
one LWP bound to CPU3, and process 101 has no bound LWPs.
example% pbind -q 1 149 101
process id 1: 0
process id 149: 3
process id 101: not bound
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Example 4 Querying LWP Bindings
The following example queries bindings of LWPs. It demon-
strates that LWP 1 of process 149 is bound to CPU3, and LWP
2 of process 149 is not bound.
example% pbind -q 149/1-2
lwp id 149/1: 3
lwp id 149/2: not bound
Example 5 Querying LWP Bindings for Processor 2:
The following example queries all LWPs bound to processor 2:
example% pbind -Q 2
lwp id 149/4: 2
lwp id 149/5: 2
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
ATRIBUTE TYPE ATRIBUTE VALUE
Availability SUNWcsu
EXIT STATUS
The following exit values are returned:
0
Successful completion.
>0
An error occurred.
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SEE ALSO
psradm(1M), psrinfo(1M), psrset(1M), processorbind(2),
processorinfo(2), sysconf(3C), attributes(5)
DIAGNOSTICS
pbind: cannot query pid 31: No such process
The process specified did not exist or has exited.
pbind: cannot bind pid 31: Not owner
The user does not have permission to bind the process.
pbind: cannot bind pid 31: Invalid argument
The specified processor is not on-line.
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