Provided by: percona-toolkit_3.2.1-1_all bug

NAME

       pt-ioprofile - Watch process IO and print a table of file and I/O activity.

SYNOPSIS

       Usage: pt-ioprofile [OPTIONS] [FILE]

       pt-ioprofile does two things: 1) get lsof+strace for -s seconds, 2) aggregate the result.
       If you specify a FILE, then step 1) is not performed.

RISKS

       WARNING: pt-ioprofile freezes the server and may crash the process, or make it perform
       badly after detaching, or leave it in a sleeping state!  Before using this tool, please:

       •   Read the tool's documentation

       •   Review the tool's known "BUGS"

       •   Test the tool on a non-production server

       •   Backup your production server and verify the backups

           pt-ioprofile should be considered an intrusive tool, and should not be used on
           production servers unless you understand and accept the risks.

DESCRIPTION

       pt-ioprofile uses "strace" and "lsof" to watch a process's IO and print out a table of
       files and I/O activity.  By default, it watches the mysqld process for 30 seconds.  The
       output is like:

         Tue Dec 27 15:33:57 PST 2011
         Tracing process ID 1833
              total       read      write      lseek  ftruncate filename
           0.000150   0.000029   0.000068   0.000038   0.000015 /tmp/ibBE5opS

       You probably need to run this tool as root.

       pt-ioprofile works by attaching "strace" to the process using "ptrace()", which will make
       it run very slowly until "strace" detaches.  In addition to freezing the server, there is
       some risk of the process crashing or performing badly after "strace" detaches from it, or
       of "strace" not detaching cleanly and leaving the process in a sleeping state.  As a
       result, this should be considered an intrusive tool, and should not be used on production
       servers unless you are comfortable with that.

OPTIONS

       --aggregate
           short form: -a; type: string; default: sum

           The aggregate function, either "sum" or "avg".

           If sum, then each cell will contain the sum of the values in it.  If avg, then each
           cell will contain the average of the values in it.

       --cell
           short form: -c; type: string; default: times

           The cell contents.

           Valid values are:

              VALUE  CELLS CONTAIN
              =====  =======================
              count  Count of I/O operations
              sizes  Sizes of I/O operations
              times  I/O operation timing

       --group-by
           short form: -g; type: string; default: filename

           The group-by item.

           Valid values are:

              VALUE     GROUPING
              =====     ======================================
              all       Summarize into a single line of output
              filename  One line of output per filename
              pid       One line of output per process ID

       --help
           Print help and exit.

       --profile-pid
           short form: -p; type: int

           The PID to profile, overrides "--profile-process".

       --profile-process
           short form: -b; type: string; default: mysqld

           The process name to profile.

       --run-time
           type: int; default: 30

           How long to profile.

       --save-samples
           type: string

           Filename to save samples in; these can be used for later analysis.

       --version
           Print the tool's version and exit.

ENVIRONMENT

       This tool does not use any environment variables.

SYSTEM REQUIREMENTS

       This tool requires the Bourne shell (/bin/sh).

BUGS

       For a list of known bugs, see <http://www.percona.com/bugs/pt-ioprofile>.

       Please report bugs at <https://jira.percona.com/projects/PT>.  Include the following
       information in your bug report:

       •   Complete command-line used to run the tool

       •   Tool "--version"

       •   MySQL version of all servers involved

       •   Output from the tool including STDERR

       •   Input files (log/dump/config files, etc.)

       If possible, include debugging output by running the tool with "PTDEBUG"; see
       "ENVIRONMENT".

DOWNLOADING

       Visit <http://www.percona.com/software/percona-toolkit/> to download the latest release of
       Percona Toolkit.  Or, get the latest release from the command line:

          wget percona.com/get/percona-toolkit.tar.gz

          wget percona.com/get/percona-toolkit.rpm

          wget percona.com/get/percona-toolkit.deb

       You can also get individual tools from the latest release:

          wget percona.com/get/TOOL

       Replace "TOOL" with the name of any tool.

AUTHORS

       Baron Schwartz

ABOUT PERCONA TOOLKIT

       This tool is part of Percona Toolkit, a collection of advanced command-line tools for
       MySQL developed by Percona.  Percona Toolkit was forked from two projects in June, 2011:
       Maatkit and Aspersa.  Those projects were created by Baron Schwartz and primarily
       developed by him and Daniel Nichter.  Visit <http://www.percona.com/software/> to learn
       about other free, open-source software from Percona.

COPYRIGHT, LICENSE, AND WARRANTY

       This program is copyright 2011-2018 Percona LLC and/or its affiliates, 2010-2011 Baron
       Schwartz.

       THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
       WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
       PURPOSE.

       This program is free software; you can redistribute it and/or modify it under the terms of
       the GNU General Public License as published by the Free Software Foundation, version 2; OR
       the Perl Artistic License.  On UNIX and similar systems, you can issue `man perlgpl' or
       `man perlartistic' to read these licenses.

       You should have received a copy of the GNU General Public License along with this program;
       if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
       MA  02111-1307  USA.

VERSION

       pt-ioprofile 3.2.1