'\" t
.\"     Title: irqtop
.\"    Author: [see the "AUTHOR(S)" section]
.\" Generator: Asciidoctor 2.0.26
.\"      Date: 2026-09-02
.\"    Manual: User Commands
.\"    Source: util-linux 2.42.3
.\"  Language: English
.\"
.TH "IRQTOP" "1" "2026-09-02" "util\-linux 2.42.3" "User Commands"
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.SH "NAME"
irqtop \- display kernel interrupt information
.SH "SYNOPSIS"
.sp
\fBirqtop\fP [options]
.SH "DESCRIPTION"
.sp
Display interrupt\-counter information from the kernel in the style of \fBtop\fP(1).
.sp
The default output is subject to change. So whenever possible, you should avoid using default outputs in your scripts. Always explicitly define expected columns by using \fB\-\-output\fP.
.SH "OPTIONS"
.sp
\fB\-o\fP, \fB\-\-output\fP \fIlist\fP
.RS 4
Specify which output columns to print. Use \fB\-\-help\fP to get a list of all supported columns. The default list of columns may be extended if \fIlist\fP is specified in the format \fI+list\fP.
.RE
.sp
\fB\-b\fP, \fB\-\-batch\fP
.RS 4
Send the produced tables to stdout instead of to a static screen.
This can be used for sending the output to other programs or to a file.
.RE
.sp
\fB\-c\fP, \fB\-\-cpu\-stat\fP \fIwhen\fP
.RS 4
Whether to show the per\-CPU statistics. Possible arguments are: \fBauto\fP, \fBnever\fP, \fBalways\fP.
The default is \fBauto\fP: the per\-CPU statistics are shown when the window is wide enough
for the full list of CPUs.
.RE
.sp
\fB\-C\fP, \fB\-\-cpu\-list\fP \fIlist\fP
.RS 4
Specify cpus in list format to show.
.RE
.sp
\fB\-d\fP, \fB\-\-delay\fP \fIseconds\fP
.RS 4
Update the tables every this number of \fIseconds\fP.
.RE
.sp
\fB\-J\fP, \fB\-\-json\fP
.RS 4
Use JSON output format. Implies \fB\-\-batch\fP.
.RE
.sp
\fB\-n\fP, \fB\-\-iter\fP \fInumber\fP
.RS 4
Specifies the maximum iterations before quitting.
.RE
.sp
\fB\-s\fP, \fB\-\-sort\fP \fIcolumn\fP
.RS 4
Specify sort criteria by column name. See \fB\-\-help\fP output to get column names. The sort criteria may be changes in interactive mode.
.RE
.sp
\fB\-S\fP, \fB\-\-softirq\fP
.RS 4
Show softirqs information.
.RE
.sp
\fB\-t\fP, \fB\-\-threshold\fP \fImin\fP
.RS 4
Only show IRQs with counters above the specified threshold. Human readable values are supported (e.g. 1.2K).
.RE
.sp
\fB\-h\fP, \fB\-\-help\fP
.RS 4
Display help text and exit.
.RE
.sp
\fB\-V\fP, \fB\-\-version\fP
.RS 4
Display version and exit.
.RE
.SH "ENVIRONMENT"
.sp
\fBLIBSMARTCOLS_DEBUG\fP=all
.RS 4
enables libsmartcols debug output.
.RE
.sp
\fBLIBSMARTCOLS_DEBUG_PADDING\fP=on
.RS 4
use visible padding characters.
.RE
.sp
\fBLIBSMARTCOLS_JSON\fP=compact|lines
.RS 4
Controls JSON output format when using \fB\-\-json\fP. Supported values are
\fBcompact\fP for JSON output with minimal whitespace, and \fBlines\fP for JSON Lines
format (one JSON object per line). If unset or set to any other value,
pretty\-printed JSON is used.
.RE
.SH "INTERACTIVE MODE KEY COMMANDS"
.sp
\fBi\fP
.RS 4
sort by short irq name or number field
.RE
.sp
\fBt\fP
.RS 4
sort by total count of interrupts (the default)
.RE
.sp
\fBd\fP
.RS 4
sort by delta count of interrupts
.RE
.sp
\fBn\fP
.RS 4
sort by long descriptive name field
.RE
.sp
\fBq Q\fP
.RS 4
stop updates and exit program
.RE
.SH "AUTHORS"
.sp
.MTO "pizhenwei\(atbytedance.com" "Zhenwei Pi" ","
.MTO "kerolasa\(atiki.fi" "Sami Kerola" ","
\c
.MTO "kzak\(atredhat.com" "Karel Zak"
.MTO "robin\(atjarry.cc" "Robin Jarry" ""
.SH "REPORTING BUGS"
.sp
For bug reports, use the \c
.URL "https://github.com/util\-linux/util\-linux/issues" "issue tracker" "."
.SH "AVAILABILITY"
.sp
The \fBirqtop\fP command is part of the util\-linux package which can be downloaded from \c
.URL "https://www.kernel.org/pub/linux/utils/util\-linux/" "Linux Kernel Archive" "."