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.\" ========================================================================
.\"
.IX Title "VIRT-TOP 1"
.TH VIRT-TOP 1 "2007-11-20" "ocaml-libvirt-0.3.3.3" "Virtualization Support"
.SH "NAME"
virt\-top \- 'top'\-like utility for virtualization stats
.SH "SUMMARY"
.IX Header "SUMMARY"
virt-top [\-options]
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
virt-top is a \fItop\fR\|(1)\-like utility for showing stats of virtualized
domains.  Many keys and command line options are the same as for
ordinary \fItop\fR.
.PP
It uses libvirt so it is capable of showing stats across a variety of
different virtualization systems.
.SH "OPTIONS"
.IX Header "OPTIONS"
.IP "\fB\-1\fR" 4
.IX Item "-1"
Display physical CPUs by default (instead of domains).
When virt-top is running, use the \fI1\fR key to toggle
between physical CPUs and domains display.
.IP "\fB\-2\fR" 4
.IX Item "-2"
Display network interfaces by default (instead of domains).
When virt-top is running, use the \fI2\fR key to toggle
between network interfaces and domains display.
.IP "\fB\-3\fR" 4
.IX Item "-3"
Display block devices (virtual disks) by default (instead of domains).
When virt-top is running, use the \fI3\fR key to toggle
between block devices and domains display.
.IP "\fB\-b\fR" 4
.IX Item "-b"
Batch mode.  In this mode keypresses are ignored.
.IP "\fB\-c uri\fR or \fB\-\-connect uri\fR" 4
.IX Item "-c uri or --connect uri"
Connect to \s-1URI\s0 given.  The default is to connect to the Xen
hypervisor.
.Sp
To connect to \s-1QEMU/KVM\s0 you would normally do \fI\-c qemu:///system\fR
.Sp
To connect to libvirtd on a remote machine you would normally do
\&\fI\-c xen://host/\fR
.Sp
Full details on connection URIs is available at
<http://libvirt.org/uri.html>
.IP "\fB\-d delay\fR" 4
.IX Item "-d delay"
Set the delay between screen updates in seconds.
The default is 3.0 seconds.  You can change this
while virt-top is running by pressing either \fIs\fR or \fId\fR key.
.IP "\fB\-n iterations\fR" 4
.IX Item "-n iterations"
Set the number of iterations to run.  The default
is to run continuously.
.IP "\fB\-o sort\fR" 4
.IX Item "-o sort"
Set the sort order to one of:
\&\fBcpu\fR (sort by \f(CW%CPU\fR used),
\&\fBmem\fR (sort by memory used),
\&\fBtime\fR (sort by total time),
\&\fBid\fR (sort by domain \s-1ID\s0),
\&\fBname\fR (sort by domain name),
\&\fBnetrx\fR (sort by network received bytes),
\&\fBnettx\fR (sort by network transmitted bytes),
\&\fBblockrdrq\fR (sort by block device [disk] read requests),
\&\fBblockwrrq\fR (sort by block device [disk] write requests).
.Sp
While virt-top is running you can change the sort
order using keys \fIP\fR (cpu), \fIM\fR (memory),
\&\fIT\fR (total time), \fIN\fR (domain \s-1ID\s0),
\&\fIF\fR (interactively select the sort field).
.IP "\fB\-s\fR" 4
.IX Item "-s"
Secure mode.  Currently this does nothing.
.IP "\fB\-\-hist\-cpu secs\fR" 4
.IX Item "--hist-cpu secs"
Set the time in seconds between updates of the historical
\&\f(CW%CPU\fR at the top right of the display.
.IP "\fB\-\-csv file.csv\fR" 4
.IX Item "--csv file.csv"
Write the statistics to file \fIfile.csv\fR.  First a header is written
showing the statistics being recorded in each column, then one line is
written for each screen update.  The \s-1CSV\s0 file can be loaded directly
by most spreadsheet programs.
.Sp
Currently the statistics which this records vary between releases of
virt-top (but the column headers will stay the same, so you can use
those to process the \s-1CSV\s0 file).
.Sp
Not every version of virt-top supports \s-1CSV\s0 output \- it depends how the
program was compiled (see \fI\s-1README\s0\fR file in the source distribution
for details).
.Sp
To save space you can compress your \s-1CSV\s0 files (if your shell supports
this feature, eg. \fIbash\fR):
.Sp
.Vb 1
\& virt-top --csv >(gzip -9 > output.csv.gz)
.Ve
.Sp
You can use a similar trick to split the \s-1CSV\s0 file up.  In this example
the \s-1CSV\s0 file is split every 1000 lines into files called
\&\fIoutput.csv.00\fR, \fIoutput.csv.01\fR etc.
.Sp
.Vb 1
\& virt-top --csv >(split -d -l 1000 - output.csv.)
.Ve
.IP "\fB\-\-no\-csv\-cpu\fR" 4
.IX Item "--no-csv-cpu"
Disable domain \s-1CPU\s0 stats in \s-1CSV\s0 output.
.IP "\fB\-\-no\-csv\-block\fR" 4
.IX Item "--no-csv-block"
Disable domain block device stats in \s-1CSV\s0 output.
.IP "\fB\-\-no\-csv\-net\fR" 4
.IX Item "--no-csv-net"
Disable domain network interface stats in \s-1CSV\s0 output.
.IP "\fB\-\-debug filename\fR" 4
.IX Item "--debug filename"
Send debug and error messages to \fIfilename\fR.
To send error messages to syslog you can do:
.Sp
.Vb 1
\& virt-top --debug >(logger -t virt-top)
.Ve
.Sp
See also \s-1REPORTING\s0 \s-1BUGS\s0 below.
.IP "\fB\-\-init\-file filename\fR" 4
.IX Item "--init-file filename"
Read \fIfilename\fR as the init file instead of the default which is
\&\fI$HOME/.virt\-toprc\fR.  See also \s-1INIT\s0 \s-1FILE\s0 below.
.IP "\fB\-\-no\-init\-file\fR" 4
.IX Item "--no-init-file"
Do not read any init file.
.IP "\fB\-\-script\fR" 4
.IX Item "--script"
Script mode.  There will be no user interface.  This is most useful
when used together with the \fI\-\-csv\fR and \fI\-n\fR options.
.IP "\fB\-\-end\-time time\fR" 4
.IX Item "--end-time time"
The program will exit at the \fItime\fR given.
.Sp
The time may be given in one of the following formats:
.RS 4
.IP "\fIYYYY-MM-DD \s-1HH:MM:SS\s0\fR" 4
.IX Item "YYYY-MM-DD HH:MM:SS"
End time is the date and time given.
.IP "\fI\s-1HH:MM:SS\s0\fR" 4
.IX Item "HH:MM:SS"
End time is the time given, today.
.IP "\fI+HH:MM:SS\fR" 4
.IX Item "+HH:MM:SS"
End time is \s-1HH\s0 hours, \s-1MM\s0 minutes, \s-1SS\s0 seconds in the future (counted
from the moment that program starts).
.IP "\fI+secs\fR" 4
.IX Item "+secs"
End time is \fIsecs\fR seconds in the future.
.RE
.RS 4
.Sp
For example to run the program for 3 minutes you could do:
.Sp
.Vb 1
\& virt-top --end-time +00:03:00
.Ve
.Sp
or:
.Sp
.Vb 1
\& virt-top --end-time +180
.Ve
.Sp
Not every version of virt-top supports this option \- it depends how the
program was compiled (see \fI\s-1README\s0\fR file in the source distribution
for details).
.RE
.IP "\fB\-\-help\fR" 4
.IX Item "--help"
Display usage summary.
.SH "KEYS"
.IX Header "KEYS"
Note that keys are case sensitive.  For example use upper-case \fIP\fR
(shift P) to sort by \f(CW%CPU\fR.  \fI^\fR before a key means a Ctrl key, so
\&\fI^L\fR is Ctrl L.
.IP "\fIspace\fR or \fI^L\fR" 4
.IX Item "space or ^L"
Updates the display.
.IP "\fIq\fR" 4
.IX Item "q"
Quits the program.
.IP "\fIh\fR" 4
.IX Item "h"
Displays help.
.IP "\fIs\fR or \fId\fR" 4
.IX Item "s or d"
Change the delay between screen updates.
.IP "\fI0\fR (number 0)" 4
.IX Item "0 (number 0)"
Show the normal list of domains display.
.IP "\fI1\fR (number 1)" 4
.IX Item "1 (number 1)"
Toggle into showing physical CPUs.  If pressed
again toggles back to showing domains (the normal
display).
.IP "\fI2\fR" 4
.IX Item "2"
Toggle into showing network interfaces.  If pressed
again toggles back to showing domains.
.IP "\fI3\fR" 4
.IX Item "3"
Toggle into showing block devices (virtual disks).  If pressed again
toggles back to showing domains.
.IP "\fIP\fR" 4
.IX Item "P"
Sort by \f(CW%CPU\fR.
.IP "\fIM\fR" 4
.IX Item "M"
Sort by memory.
.IP "\fIT\fR" 4
.IX Item "T"
Sort by total time.
.IP "\fIN\fR" 4
.IX Item "N"
Sort by domain \s-1ID\s0.
.IP "\fIF\fR" 4
.IX Item "F"
Select the sort field interactively (there are other
sort fields you can choose using this key).
.IP "\fIW\fR" 4
.IX Item "W"
This creates or overwrites the init file with the current settings.
.Sp
This key is disabled if \fI\-\-no\-init\-file\fR was specified on the
command line or if \fIoverwrite-init-file false\fR is given in
the init file.
.SH "INIT FILE"
.IX Header "INIT FILE"
When virt-top starts up, it reads initial settings from the
file \fI.virt\-toprc\fR in the user's home directory.
.PP
The name of this file may be overridden using the \fI\-\-init\-file
filename\fR command line option or may be disabled entirely using
\&\fI\-\-no\-init\-file\fR.
.PP
The init file has a simple format.  Blank lines and comments
beginning with \fI#\fR are ignored.  Everything else is a set of
\&\fIkey value\fR pairs, described below.
.IP "\fBdisplay\fR \fItask|pcpu|block|net\fR" 4
.IX Item "display task|pcpu|block|net"
Sets the major display mode to one of \fItask\fR (tasks, the
default), \fIpcpu\fR (physical CPUs), \fIblock\fR (block devices),
or \fInet\fR (network interfaces).
.IP "\fBdelay\fR \fIsecs\fR" 4
.IX Item "delay secs"
Sets the delay between display updates in seconds.
.IP "\fBhist-cpu\fR \fIsecs\fR" 4
.IX Item "hist-cpu secs"
Sets the historical \s-1CPU\s0 delay in seconds.
.IP "\fBiterations\fR \fIn\fR" 4
.IX Item "iterations n"
Sets the number of iterations to run before we exit.  Setting
this to \fI\-1\fR means to run continuously.
.IP "\fBsort\fR \fIcpu|mem|time|id|name|...\fR" 4
.IX Item "sort cpu|mem|time|id|name|..."
Sets the sort order.  The option names are the same as for
the command line \fI\-o\fR option.
.IP "\fBconnect\fR \fIuri\fR" 4
.IX Item "connect uri"
Sets the default connection \s-1URI\s0.
.IP "\fBdebug\fR \fIfilename\fR" 4
.IX Item "debug filename"
Sets the default filename to use for debug and error messages.
.IP "\fBcsv\fR \fIfilename\fR" 4
.IX Item "csv filename"
Enables \s-1CSV\s0 output to the named file.
.IP "\fBcsv-cpu\fR \fItrue|false\fR" 4
.IX Item "csv-cpu true|false"
Enable or disable domain \s-1CPU\s0 stats in \s-1CSV\s0 output.
.IP "\fBcsv-block\fR \fItrue|false\fR" 4
.IX Item "csv-block true|false"
Enable or disable domain block device stats in \s-1CSV\s0 output.
.IP "\fBcsv-net\fR \fItrue|false\fR" 4
.IX Item "csv-net true|false"
Enable or disable domain network interface stats in \s-1CSV\s0 output.
.IP "\fBbatch\fR \fItrue|false\fR" 4
.IX Item "batch true|false"
Sets batch mode.
.IP "\fBsecure\fR \fItrue|false\fR" 4
.IX Item "secure true|false"
Sets secure mode.
.IP "\fBscript\fR \fItrue|false\fR" 4
.IX Item "script true|false"
Sets script mode.
.IP "\fBend-time\fR \fItime\fR" 4
.IX Item "end-time time"
Set the time at which the program exits.  See above for the
time formats supported.
.IP "\fBoverwrite-init-file\fR \fIfalse\fR" 4
.IX Item "overwrite-init-file false"
If set to \fIfalse\fR then the \fIW\fR key will not overwrite the
init file.
.PP
Note that in the current implementation, options specified in
the init file override options specified on the command line.
This is a bug and this behaviour may change in the future.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fItop\fR\|(1),
\&\fIvirsh\fR\|(1),
\&\fIxm\fR\|(1),
\&\fIxentop\fR\|(1),
<http://www.libvirt.org/ocaml/>,
<http://www.libvirt.org/>,
<http://et.redhat.com/~rjones/>,
<http://caml.inria.fr/>
.SH "AUTHORS"
.IX Header "AUTHORS"
Richard W.M. Jones <rjones @ redhat . com>
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
(C) Copyright 2007 Red Hat Inc., Richard W.M. Jones
http://libvirt.org/
.PP
This program is free software; you can redistribute it and/or modify
it under the terms of the \s-1GNU\s0 General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
.PP
This program is distributed in the hope that it will be useful,
but \s-1WITHOUT\s0 \s-1ANY\s0 \s-1WARRANTY\s0; without even the implied warranty of
\&\s-1MERCHANTABILITY\s0 or \s-1FITNESS\s0 \s-1FOR\s0 A \s-1PARTICULAR\s0 \s-1PURPOSE\s0.  See the
\&\s-1GNU\s0 General Public License for more details.
.PP
You should have received a copy of the \s-1GNU\s0 General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, \s-1MA\s0 02139, \s-1USA\s0.
.SH "REPORTING BUGS"
.IX Header "REPORTING BUGS"
Bugs can be viewed on the Red Hat Bugzilla page:
<https://bugzilla.redhat.com/>.
.PP
If you find a bug in virt\-top, please follow these steps to report it:
.IP "1. Check for existing bug reports" 4
.IX Item "1. Check for existing bug reports"
Go to <https://bugzilla.redhat.com/> and search for similar bugs.
Someone may already have reported the same bug, and they may even
have fixed it.
.IP "2. Capture debug and error messages" 4
.IX Item "2. Capture debug and error messages"
Run
.Sp
.Vb 1
\& virt-top --debug virt-top.log
.Ve
.Sp
and keep \fIvirt\-top.log\fR.  It contains error messages which you
should submit with your bug report.
.IP "3. Get version of virt-top and version of libvirt." 4
.IX Item "3. Get version of virt-top and version of libvirt."
In virt\-top, press the \fIh\fR (help) key, and write down the version of
virt-top and the version of libvirt.  They are shown in the first
line.
.IP "4. Submit a bug report." 4
.IX Item "4. Submit a bug report."
Go to <https://bugzilla.redhat.com/> and enter a new bug.
Please describe the problem in as much detail as possible.
.Sp
Remember to include the version numbers (step 3) and the debug
messages file (step 2).
.IP "5. Assign the bug to rjones @ redhat.com" 4
.IX Item "5. Assign the bug to rjones @ redhat.com"
Assign or reassign the bug to \fBrjones @ redhat.com\fR (without the
spaces).  You can also send me an email with the bug number if you
want a faster response.