PSRINFO(8) Maintenance Commands and Procedures PSRINFO(8)

psrinfo - displays information about processors

psrinfo [-p] [-v] [processor_id]...

psrinfo -t [-S state | -c | -p]

psrinfo -r [<propname> | all]

psrinfo displays information about processors. Each physical socket may contain multiple cores, which in turn can contain multiple virtual processors (also referred to as CPUs). Each virtual processor is an entity with its own ID, capable of executing independent threads.

Without the processor_id operand, psrinfo displays one line for each configured processor, displaying whether it is on-line, non-interruptible (designated by no-intr), spare, off-line, faulted, disabled, or powered off, and when that status last changed. Use the processor_id operand to display information about a specific processor. See OPERANDS.

The following options are supported:


When used with -t, report the total number of CPU cores.


Display the number of physical sockets in a system.

When combined with the -v option, reports additional information about each physical socket.

-r propname

Report CPU-specific properties that apply to the system as a whole. Supplying "all" will list all such properties in key=value format. Currently, the only defined property is smt_enabled, a boolean property indicating whether simultaneous multi-threading (hyper-threading) is active or not.

-S state

When used with -t, report the total number of CPUs in the given state.

-s processor_id

Silent mode. Displays 1 if the specified processor is fully on-line, or 0 otherwise.

Use silent mode when using psrinfo in shell scripts.


Report totals. Without arguments, reports the total number of CPUs. This can be combined with the -p, -c, or -S options to modify the total.


Verbose mode. Displays additional information about the specified processors, including: processor type, floating point unit type and clock speed. If any of this information cannot be determined, psrinfo displays unknown.

When combined with the -p option, reports additional information about each physical processor.

The following operands are supported:


The processor ID of the processor about which information is to be displayed.

Specify processor_id as an individual processor number (for example, 3), multiple processor numbers separated by spaces (for example, 1 2 3), or a range of processor numbers (for example, 1-4). It is also possible to combine ranges and (individual or multiple) processor_ids (for example, 1-3 5 7-8 9).

This cannot be specified along with the -r or -t options.

Example 1 Displaying Information About All Configured Processors in Verbose Mode

The following example displays information about all configured processors in verbose mode.

psrinfo -v

Example 2 Determining If a Processor is On-line

The following example uses psrinfo in a shell script to determine if a processor is on-line.

if [ "`psrinfo -s 3 2> /dev/null`" −eq 1 ]
	echo "processor 3 is up"

Example 3 Displaying Information About the Physical Sockets in the System

Use the -tp options to report the number of sockets.

> psrinfo -tp


Without the -t option, -p also takes processor IDs:

> psrinfo -p 0 28    # IDs 0 and 28 exist on the
1                    # same socket
> psrinfo -p 0 1     # IDs 0 and 1 exist on different
2                    # sockets

In this example, virtual processors 0 and 28 exist on the same socket. Virtual processors 0 and 1 do not. This is specific to this example and is and not a general rule.

The following exit values are returned:


Successful completion.


An error occurred.

p_online(2), processor_info(2), attributes(7), psradm(8)

psrinfo: processor 9: Invalid argument

The specified processor does not exist.

April 25, 2019 OmniOS