TRACE-CMD-HIST(1)                                          TRACE-CMD-HIST(1)

NAME         top

       trace-cmd-hist - show histogram of events in trace.dat file

SYNOPSIS         top

       trace-cmd hist [OPTIONS][input-file]

DESCRIPTION         top

       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

OPTIONS         top

       -i input-file
           By default, trace-cmd hist will read the file trace.dat. But the
           -i option open up the given input-file instead. Note, the input
           file may also be specified as the last item on the command line.

           To compact all events and show the call graphs by ignoring tasks
           and different PIDs, add the -P to do so. Instead of showing the
           task name, it will group all chains together and show "<all

SEE ALSO         top

       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)

AUTHOR         top

       Written by Steven Rostedt, <[1]>

RESOURCES         top


COPYING         top

       Copyright (C) 2010 Red Hat, Inc. Free use of this software is granted
       under the terms of the GNU Public License (GPL).

NOTES         top


COLOPHON         top

       This page is part of the trace-cmd (a front-end for Ftrace) project.
       Information about the project can be found at [unknown -- if you
       know, please contact] If you have a bug report for
       this manual page, send it to Steven Rostedt <>.
       This page was obtained from the project's upstream Git repository 
       on 2017-03-13.  If you discover any rendering problems in this HTML
       version of the page, or you believe there is a better or more up-to-
       date source for the page, or you have corrections or improvements to
       the information in this COLOPHON (which is not part of the original
       manual page), send a mail to

                                 12/17/2015                TRACE-CMD-HIST(1)