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, described below. 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 priviledges, 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.
The current pmchart configuration file syntax has evolved from the original SGI pmchart syntax.
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 as [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.
#kmchartalthough pmchart provides backwards compatibility for original SGI pmchart formats with an initial line of
version <n> <host-clause>where <n> depends on the configuration file type, and is 1 for kmchart else 1.1, 1.2 or 2.0 for pmchart.
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. After the view is loaded, the title visibility and setting can be manipulated using the Chart Title text box in the Edit→Chart dialog.
[scale [from] <ymin> [to] <ymax>] [legend <onoff>]If scale is specified, 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.
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.
For pmchart configuration files, the keyword title must be used instead of legend. pmchart supports either keyword.
The color clause is optional for new pmchart configuration files, but it is mandatory for older pmchart configuration files. <colorspec> may be one of the following:
#-cyclewhere 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) on X11 platforms.
tab <label> [host <host>] [points <points> [samples <samples>]]