Provided by: pcp-gui_3.10.8build1_amd64 
NAME
pmchart - strip chart tool for Performance Co-Pilot
SYNOPSIS
pmchart [-CVWz] [-A align] [-a archive] [-c configfile] [-f fontfamily] [-F fontsize] [-g geometry] [-g
geometry] [-h host] [-o outfile] [-O offset] [-p port] [-s samples] [-S starttime] [-T endtime] [-t
interval] [-v visible] [-Z timezone] [sources...]
DESCRIPTION
pmchart is a graphical utility that plots performance metrics values available through the facilities of
the Performance Co-Pilot (PCP). Multiple charts can be displayed simultaneously, either aligned on the
unified time axis (X-axis), and through the use of multiple interface Tabs.
Metric values can be sourced from one or more live hosts (simultaneously). Alternatively, one or more
PCP archives can be used as a source of historical data. See PCPIntro(1) for an in-depth discussion of
the capabilities of the PCP framework, many of which are used by pmchart.
Many aspects of the behaviour of pmchart can be customised through the interface. In particular, the use
of "views" (refer to the section describing VIEWS later in this document) allows predefined sets of
metrics and charting parameters like colors, scaling, titles, legends, and so on to be stored for later
use, or use with different hosts and archives. In addition, the Preferences dialog allows customisations
to the rest of the pmchart user interface to be saved and restored between different invocations of the
tool. This allows the default background color, highlight color, contents and location of the toolbar,
and many other aspects to be configured.
pmchart makes extensive use of the pmtime(1) utility for time control, refer to the pmtime manual page
for further details of its operation.
Options which control the default source, timing and layout of the pmchart window are as follows:
-a Performance metric values are retrieved from the Performance Co-Pilot (PCP) archive log file
identified by the base name archive, by default. The initial Tab created will be an archive mode
Tab. Multiple -a options can be presented, and the list of archives is used for sourcing metric
values. Any sources listed on the command line are assumed to be archives if this option is used.
-c configfile specifies an initial view to load, using the default source of metrics. Multiple -c
views can be specified, and they will all be opened in the default Tab with the default source of
metrics.
-C Used with -c, the view(s) are parsed, any errors are reported, and the tool exits. This is
primarily intended for testing purposes. If a second -C option is presented, pmchart also connects
to pmcd(1) to check the semantics of metrics.
-f Specify the default font family to be used in several chart components, such as the chart title,
legend, and Y-axis label. The default value is "Sans Serif". This setting does not affect the rest
of the user interface, where the value is inherited from the environment in which pmchart operates,
and differs according to the look-and-feel of each platform.
-F Specify the default font point size to be used in several chart components, such as the chart title,
legend, and Y-axis label. The default is platform dependent, but is either 7, 8 or 9. This setting
does not affect the rest of the user interface.
-g Generate image with the specified geometry (width and height). This option is only useful when used
in conjunction with the -o option for generating an output image. The geometry argument takes the
form "WxH" (e.g. 240x120).
-h Current performance metric values are retrieved from the nominated host machine by default.
Multiple -h options can be presented, and the list of hosts is used for sourcing metric values. Any
sources listed on the command line are assumed to be hosts if this option is used.
-o Generate an image file named outfile, and then exit. This is most useful when run with an archive
and one or more views. The generated image will be in the format specified as the file extension
(automatically determined from outfile). If no extension can be determined, then the GIF format is
used and the generated file is named with this extension. The supported image file formats include:
bmp, jpeg, jpg, png, ppm, tif, tiff, xbm, and xpm.
-p port number for connection to an existing pmtime time control process.
-s Specifies the number of samples that will be retained before discarding old data (replaced by new
values at the current time position). This value can subsequently be modified through the Edit Tab
dialog.
-t Sets the inital update interval to something other than the default 1 second. The interval argument
follows the syntax described in PCPIntro(1), and in the simplest form may be an unsigned integer
(the implied units in this case are seconds).
-v Sets the inital visible samples that will be displayed in all charts in the default Tab. This value
must be less than or equal to the total number of samples retained (the -s value).
-V Display pmchart version number and exit
-W Export images using an opaque(white) background
-Z By default, pmtime reports the time of day according to the local timezone on the system where
pmchart is run. The -Z option changes the timezone to timezone in the format of the environment
variable TZ as described in environ(7).
-z Change the reporting timezone to the local timezone at the host that is the source of the
performance metrics, as identified via either the -h or -a options.
The -S, -T, -O and -A options may be used to define a time window to restrict the samples retrieved, set
an initial origin within the time window, or specify a "natural" alignment of the sample times; refer
to PCPIntro(1) for a complete description of these options.
VIEWS
The primary pmchart configuration file is the "view", which allows the metadata associated with one or
more charts to be saved in the filesystem. This metadata describes all aspects of the charts, including
which PCP metrics and instances are to be used, which hosts, which colors, the chart titles, use of chart
legends, and much more.
From a conceptual point of view, there are two classes of view. These views share the same configuration
file format - refer to a later section for a complete description of this format. The differences lie in
where they are installed and how they are manipulated.
The first class, the "system" view, is simply any view that is installed as part of the pmchart package.
These are stored in $PCP_VAR_DIR/config/pmchart. When the File→Open View dialog is displayed, it is
these views that are initially listed. The system views cannot be modified by a normal user, and should
not be modified even by a user with suitable privileges, as they will be overwritten during an upgrade.
The second class of view is the "user" view. These views are created on-the-fly using the File→Save View
dialog. This is a mechanism for individual users to save their commonly used views. Access to these
views is achieved through the File→Open View dialog, as with the system views. Once the dialog is
opened, the list of views can be toggled between user and system views by clicking on the two toggle
buttons in the top right corner. User views are stored in $HOME/.pcp/pmchart.
TABS
pmchart provides the common user interface concept of the Tab, which is most prevalent in modern web
browsers. Tabs allow pmchart to update many more charts than the available screen real estate allows, by
providing a user interface mechanism to stack (and switch between) different vertical sets of charts.
Switching between Tabs is achieved by clicking on the Tab labels, which are located along the top of the
display beneath the Menu and Tool bars).
Each Tab has a mode of operation (either live or archive - pmchart can support both modes
simultaneously), the total number of samples and currently visible points, and a label describing the Tab
which is displayed at the top of the pmchart window. New Tabs can be created using the File→Add Tab
dialog.
In order to save on vertical screen real estate, note that the user interface element for changing
between different Tabs (and its label) are only displayed when more than one Tab exists. A Tab can be
dismissed using the File→Close Tab menu, which removes the current Tab and any charts it contained.
IMAGES and PRINTING
A static copy of the currently displayed vertical series of charts can be captured in two ways.
When the intended display device is the screen, the File→Export menu option should be used. This allows
exporting the charts in a variety of image formats, including PNG, JPEG, GIF, and BMP. The image size
can be scaled up or down in any dimension.
Alternatively, when the intended display device is paper, the File→Print menu option can be used. This
supports the usual set of printing options (choice of printer, grayscale/color, landscape/portrait,
scaling to different paper sizes, etc), and in addition allows printing to the intermediate printer
formats of PostScript and Portable Document Format (PDF).
RECORDING
It is possible to make a recording of a set of displayed charts, for later playback through pmchart or
any of the other Performance Co-Pilot tools. The Record→Start functionality is simple to configure
through the user interface, and allows fine-tuning of the recording process (including record frequencies
that differ to the pmchart update interval, alternate file locations, etc).
pmchart produces recordings that are compatible with the PCP pmafm(1) replay mechanism, for later
playback via a new instance of pmchart. In addition, when recording through pmchart one can also replay
the recording immediately, as on termination of the recording (through the Record→Stop menu item), an
archive mode Tab will be created with the captured view.
Once recording is active in a Live Tab, the Time Control status button in the bottom left corner of the
pmchart window is displayed with a distinctive red dot. At any time during a pmchart recording session,
the amount of space used in the filesystem by that recording can be displayed using the Record→Query menu
item.
Finally, the Record→Detach menu option provides a mechanism whereby the recording process can be
completely divorced from the running pmchart process, and allowed to continue on when pmchart exits. A
dialog displaying the current size and estimated rate of growth for the recording is presented. On the
other hand, if pmchart is terminated while recording is in process, then the recording process will
prompt the user to choose immediate cessation of recording or for it to continue on independently.
All of the record mode services available from pmchart are implemented with the assistance of the base
Performance Co-Pilot logging services - refer to pmlogger(1) and pmafm(1) for an extensive description of
the capabilities of these tools.
CONFIGURATION FILE SYNTAX
pmchart loads predefined chart configurations (or "views") from external files that conform to the
following rules. In the descriptions below keywords (shown in bold) may appear in upper, lower or mixed
case, elements shown in [stuff] are optional, and user-supplied elements are shown as <other stuff>. A
vertical bar (|) is used where syntactic elements are alternatives. Quotes (") may be used to enclose
lexical elements that may contain white space, such as titles, labels and instance names.
1. The first line defines the configuration file type and should be
#kmchart
although pmchart provides backwards compatibility for the older pmchart view formats with an initial
line of
#pmchart
2. After the first line, lines beginning with "#" as the first non-white space character are treated as
comments and skipped. Similarly blank lines are skipped.
3. The next line should be
version <n> <host-clause>
where <n> depends on the configuration file type, and is 1 for pmchart else 1.1, 1.2 or 2.0 for
pmchart.
The <host-clause> part is optional (and ignored) for pmchart configuration files, but required for the
pmchart configuration files, and is of the form
host literal
or
host dynamic
4. A configuration contains one or more charts defined as follows:
chart [title <title>] style <style> <options>
If specified, the title will appear centred and above the graph area of the chart. The <title> is
usually enclosed in quotes (") and if it contains the sequence "%h" this will be replaced by the short
form of the hostname for the default source of metrics at the time this chart was loaded.
Alternatively, "%H" can be used to insert the full host name. If the hostname appears to be an inet
or IPv6 address, no shortening will be attempted; it will be used as-is in both replacement cases.
After the view is loaded, the title visibility and setting can be manipulated using the Chart Title
text box in the Edit→Chart dialog.
The <style> controls the initial plotting style of the chart, and should be one of the keywords plot
(line graph), bar, stacking (stacked bar), area or utilization. After the view is loaded, the
plotting style can be changed using the Edit→Chart Style dropdown list.
The <options> are zero or more of the optional elements:
[scale [from] <ymin> [to] <ymax>] [legend <onoff>]
If scale is specfied, the vertical scaling is set for all plots in the chart to a y-range defined by
<ymin> and <ymax>. Otherwise the vertical axis will be autoscaled based on the values currently being
plotted.
<onoff> is one of the keywords on or off and the legend clause controls the presence or absence of the
plot legend below the graph area. The default is for the legend to be shown. After the view is
loaded, the legend visibility can be toggled using the Show Legend button in the Edit→Chart dialog.
5. pmchart supports a global clause to specify the dimensions of the top-level window (using the width
and height keywords), the number of visible points (points keyword) and the starting X and Y axis
positions on the screen (xpos and ypos keywords). Each of these global attributes takes an integer
value as the sole qualifier.
6. Each chart has one or more plots associated with it, as defined by one of the following
specifications:
plot
[legend <title>] [color <colorspec>] [host <hostspec>]
metric <metricname>
[ instance <inst> | matching <pat> | not-matching <pat> ]
The keyword plot may be replaced with the keyword optional-plot, in which case if the source of
performance data does not include the specified performance metric and/or instance, then this plot is
silently dropped from the chart.
If specified, the title will appear in the chart legend. The <title> is usually enclosed in quotes
(") and it may contain one or more wildcard characters which will be expanded using metric name,
instance name, and host name for the plot. The wildcards are "%i" (short unique instance name, up to
the first whitespace), "%I" (full instance name), "%h" (short host name, up to the first dot), %H
(full host name), "%m" (metric name shortened to the final two PMNS components), and "%M" (full metric
name).
For older pmchart configuration files, the keyword title must be used instead of legend. Nowadays
pmchart supports either keyword.
The color clause is optional for newer pmchart configuration files, but it was mandatory in the
original pmchart configuration file format. <colorspec> may be one of the following:
#-cycle
rgbi:rr:gg:bb
#rgb
#rrggbb
#rrrgggbbb
#rrrrggggbbbb
<Xcolor>
where each of r, g and b are hexidecimal digits (0-9 and A-F) representing respectively the red, green
and blue color components. <Xcolor> is one of the color names from the X color database, e.g. red or
steelblue, see also the output from showrgb(1).
The "color" #-cycle specifies that pmchart should use the next in a pallet of colors that it uses
cyclically for each chart. This is the default if the color clause is omitted.
The <hostspec> in the host clause may be a hostname, an IP address or an asterisk (*); the latter is
used to mean the default source of performance metrics. For older pmchart configuration files, the
host clause must be present, for new pmchart configuration files it is optional, and if missing the
default source of performance metrics will be used.
The optional instance specification,
(a)
is omitted in which case one plot will be created for every instance of the <metricname> metric
(b)
starts with instance, in which case only the instance named <inst> will be plotted
(c)
starts with matching, in which case all instances whose names match the pattern <pat> will be
plotted; the pattern uses extended regular expression notation in the style of egrep(1) (refer to
the PMCD view for an example)
(d)
starts with not-matching, in which case all instances whose names do not match the pattern <pat>
will be plotted; the pattern uses extended regular expression notation in the style of egrep(1)
(refer to the Netbytes view for an example)
pmchart uses a bizarre syntactic notation where <inst> and <pat> extend from the first non-white space
character to the end of the input line. For pmchart configuration files these elements are either
delimited by white space, or enclosed in quotes (").
7. The optional tab directive can be used to create views with multiple charts which span multiple Tabs.
The syntax is as follows:
tab <label> [host <host>] [points <points> [samples <samples>]]
All chart specifications following this keyword will be created
on the new Tab, until the end of the configuration file or until
another tab keyword is encountered.
PCP ENVIRONMENT
Environment variables with the prefix PCP_ are used to parameterize the file and directory names used by
PCP. On each installation, the file /etc/pcp.conf contains the local values for these variables. The
$PCP_CONF variable may be used to specify an alternative configuration file, as described in pcp.conf(5).
Of particular note, the $PCP_XCONFIRM_PROG setting is explicitly and unconditionally overridden by
pmchart. This is set to the pmconfirm(1), utility, in order that some popup dialogs (particularly in the
area of Recording) maintain a consistent look-and-feel with the rest of the pmchart application.
SEE ALSO
pmtime(1), pmconfirm(1), pmdumptext(1), PCPIntro(1), pmafm(1), pmval(1), pmcd(1), pminfo(1), pcp.conf(5), pcp.env(5) and pmns(5).