PT-IOPROFILE(1p)					User Contributed Perl Documentation					  PT-IOPROFILE(1p)

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

       The following section is included to inform users about the potential risks, whether known or unknown, of using this tool.  The two main
       categories of risks are those created by the nature of the tool (e.g. read-only tools vs. read-write tools) and those created by bugs.

       pt-ioprofile is a read-only tool, so your data is not at risk. However, it 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 also some risk of the process
       crashing or performing badly after "strace" detaches from it, or indeed 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.

       At the time of this release, we know of no bugs that could cause serious harm to users.

       The authoritative source for updated information is always the online issue tracking system.  Issues that affect this tool will be marked
       as such.  You can see a list of such issues at the following URL: http://www.percona.com/bugs/pt-ioprofile <http://www.percona.com/bugs/pt-
       ioprofile>.

       See also "BUGS" for more information on filing bugs and getting help.

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.

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 <http://www.percona.com/bugs/pt-ioprofile>.

       Please report bugs at https://bugs.launchpad.net/percona-toolkit <https://bugs.launchpad.net/percona-toolkit>.  Include the following
       information in your bug report:

       o   Complete command-line used to run the tool

       o   Tool "--version"

       o   MySQL version of all servers involved

       o   Output from the tool including STDERR

       o   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/ <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 developed by Percona for MySQL support and consulting.
       Percona Toolkit was forked from two projects in June, 2011: Maatkit and Aspersa.  Those projects were created by Baron Schwartz and
       developed primarily by him and Daniel Nichter, both of whom are employed by Percona.  Visit <http://www.percona.com/software/> for more
       software developed by Percona.

COPYRIGHT, LICENSE, AND WARRANTY
       This program is copyright 2010-2011 Baron Schwartz, 2011-2012 Percona Inc.  Feedback and improvements are welcome.

       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 2.1.2

perl v5.14.2							    2012-06-15							  PT-IOPROFILE(1p)