'\" t
.\"     Title: trace-cmd-hist
.\"    Author: [see the "AUTHOR" section]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 09/11/2020
.\"    Manual: \ \&
.\"    Source: \ \&
.\"  Language: English
.\"
.TH "TRACE\-CMD\-HIST" "1" "09/11/2020" "\ \&" "\ \&"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
trace-cmd-hist \- show histogram of events in trace\&.dat file
.SH "SYNOPSIS"
.sp
\fBtrace\-cmd hist\fR [\fIOPTIONS\fR][\fIinput\-file\fR]
.SH "DESCRIPTION"
.sp
The trace\-cmd(1) hist displays a histogram form from the trace\&.dat file\&. Instead of showing the events as they were ordered, it creates a histogram that can be displayed per task or for all tasks where the most common events appear first\&. It uses the function tracer and call stacks that it finds to try to put together a call graph of the events\&.
.SH "OPTIONS"
.PP
\fB\-i\fR \fIinput\-file\fR
.RS 4
By default, trace\-cmd hist will read the file
\fItrace\&.dat\fR\&. But the
\fB\-i\fR
option open up the given
\fIinput\-file\fR
instead\&. Note, the input file may also be specified as the last item on the command line\&.
.RE
.PP
\fB\-P\fR
.RS 4
To compact all events and show the call graphs by ignoring tasks and different PIDs, add the
\fB\-P\fR
to do so\&. Instead of showing the task name, it will group all chains together and show "<all pids>"\&.
.RE
.SH "SEE ALSO"
.sp
trace\-cmd(1), trace\-cmd\-record(1), trace\-cmd\-report(1), trace\-cmd\-start(1), trace\-cmd\-stop(1), trace\-cmd\-extract(1), trace\-cmd\-reset(1), trace\-cmd\-split(1), trace\-cmd\-listen(1)
.SH "AUTHOR"
.sp
Written by Steven Rostedt, <\m[blue]\fBrostedt@goodmis\&.org\fR\m[]\&\s-2\u[1]\d\s+2>
.SH "RESOURCES"
.sp
git://git\&.kernel\&.org/pub/scm/linux/kernel/git/rostedt/trace\-cmd\&.git
.SH "COPYING"
.sp
Copyright (C) 2010 Red Hat, Inc\&. Free use of this software is granted under the terms of the GNU Public License (GPL)\&.
.SH "NOTES"
.IP " 1." 4
rostedt@goodmis.org
.RS 4
\%mailto:rostedt@goodmis.org
.RE