Provided by: percona-toolkit_2.2.7-1~dfsg1_all 
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://bugs.launchpad.net/percona-toolkit>. 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 2011-2014 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 2.2.7