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System Administration Commandspbind(1M)


NAME

 pbind - control and query bindings of processes to processors

SYNOPSIS

 pbind -b processor_id pid ...
 pbind -u pid ...
 pbind [-q] [pid ...]

DESCRIPTION

 

pbind controls and queries bindings of processes to processors. pbind binds all the LWPs (lightweight processes) of a process to a processor, or removes or displays the bindings.

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 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 interactive shell to a processor, for example, binds all commands executed by the shell.

Superusers may bind or unbind any process, and other users can use pbind to bind or unbind any process for which the user has permission to signal, that is, any process that has the same effective user ID as the user.

OPTIONS

 

The following options are supported:

-b processor_id
Binds all the LWPs of the specified processes to the processor processor_id. Specify processor_id as the processor ID of the processor to be controlled or queried. processor_id must be present and on-line. Use the psrinfo command to determine whether or not processor_id 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, the bindings of only one of the bound LWPs will be displayed.
-u
Removes the bindings of all LWPs of the specified processes, allowing them to be executed on any on-line processor.

OPERANDS

 

The following operands are supported:

pid
The process ID of the process to be controlled or queried.

EXAMPLES

 Example 1.
 

Binding processes

 

The following example binds processes 204 and 223 to processor 2.

 
example% pbind -b 2 204 223

This command displays the following output:

 
process id 204: was 2, now 2
process id 223: was 3, now 2

Unbinding a process

 

The following example unbinds process 204.

 
example% pbind -u 204

Querying Bindings

 

The following example 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

This command displays the following output:

 
process id 1: 0
process id 149: 3
process id 101: not bound

ATTRIBUTES

 

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
AvailabilitySUNWcsu

EXIT STATUS

 

The following exit values are returned:

0
Successful completion.
>0
An error occurred.

SEE ALSO

 

psradm(1M), psrinfo(1M), psrset(1M), processor_bind(2), processor_info(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.

SunOS 5.9Go To TopLast Changed 10 Jan 1997

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.