INTRSTAT(8) Maintenance Procedures INTRSTAT(8)


intrstat - report interrupt statistics


/usr/sbin/intrstat [-c cpulist | -C processor_set_id] [-T u | d ]
[-x opt[=val]] [interval [count]]


The intrstat utility gathers and displays run-time interrupt statistics.
The output is a table of device names and CPU IDs, where each row of the
table denotes a device, and each column of the table denotes a CPU. Each
cell in the table contains both the raw number of interrupts for the
given device on the given CPU, and the percentage of absolute time spent
in that device's interrupt handler on that CPU.

The device name is given in the form of {name}#{instance}. The name is
the normalized driver name, and typically corresponds to the name of the
module implementing the driver. See ddi_driver_name(9F). Many Sun-
delivered drivers have their own manual pages. See Intro(4).

If standard output is a terminal, the table contains as many columns of
data as can fit within the terminal width. If standard output is not a
terminal, the table contains at most four columns of data. By default,
data is gathered and displayed for all CPUs. If the data cannot fit in a
single table, it is printed across multiple tables. The set of CPUs for
which data is displayed can be optionally specified with the -c or -C

By default, intrstat displays data once per second and runs indefinitely.
Both of these behaviors can be optionally controlled with the interval
and count parameters, respectively. See OPERANDS.

Because intrstat uses dynamic discovery, it reports only on devices that
raise interrupts while the command is running. Any devices that are
silent while intrstat is running are not displayed.

intrstat induces a small system-wide performance degradation. As a
result, only the super-user can run intrstat by default. The Dynamic
Tracing Guide explains how administrators can grant privileges to other
users to permit them to run intrstat.


The following options are supported:

-c cpulist

Displays data for the CPUs specified by cpulist.

cpulist can be a single processor ID (for example, 4), a range of
processor IDs (for example, 4-6), or a comma separated list of
processor IDs or processor ID ranges (for example, 4,5,6 or 4,6-8).

-C processor_set_id

Displays data for the CPUs in the processor set specified by

intrstat modifies its output to always reflect the CPUs in the
specified processor set. If a CPU is added to the set, intrstat
modifies its output to include the added CPU. If a CPU is removed
from the set, intrstat modifies its output to exclude the removed
CPU. At most one processor set can be specified.

-T u | d

Display a time stamp.

Specify u for a printed representation of the internal representation
of time. See time(2). Specify d for standard date format. See

-x opt[=val]

Enable or modify a DTrace runtime option or D compiler option. The
list of options is found in the Dynamic Tracing Guide. A boolean
option is enabled by specifying its name. Options with values are set
by separating the option name and value with an equal sign (=)


The following operands are supported:


Indicates the number of intervals to execute before exiting.


Indicates the number of seconds to be executed before exiting.


Example 1: Using intrstat Without Options

Without options, intrstat displays a table of trap types and CPUs. At
most, four columns can fit in the default terminal width. If there are
more than four CPUs, multiple tables are displayed.

The following example runs intrstat on a uniprocessor Intel IA/32-based

example# intrstat
device | cpu0 %tim
ata#0 | 166 0.4
ata#1 | 0 0.0
audioi810#0 | 6 0.0
i8042#0 | 281 0.7
iprb#0 | 6 0.0
uhci#1 | 6 0.0
uhci#2 | 6 0.0

device | cpu0 %tim
ata#0 | 161 0.5
ata#1 | 0 0.0
audioi810#0 | 6 0.0
i8042#0 | 303 0.6
iprb#0 | 6 0.0
uhci#1 | 6 0.0
uhci#2 | 6 0.0


See attributes(7) for descriptions of the following attributes:

|Interface Stability | See below. |

The command-line syntax is Evolving. The human-readable output is


Intro(4), attributes(7), dtrace(8), trapstat(8), ddi_driver_name(9F)

Dynamic Tracing Guide:

December 10, 2017 INTRSTAT(8)