NAME¶

webpingvis - visualize Web server response time

SYNOPSIS¶

webpingvis [-CiVz] [-A align] [-a archive] [-h host] [-m max] [-n pmnsfile] [-O time] [-p port] [-S time] [-T time] [-t interval] [-x version] [-Z timezone]

DESCRIPTION¶

webpingvis displays a summary of Web server response-time statistics collected from the Performance Co-Pilot (PCP) infrastructure. The display is modulated by the values of performance metrics retrieved from the target host (which is running pmcd(1) and the pmdawebping(1) Performance Metrics Domain Agent) or from the PCP archive log identified by archive. The display is updated every interval seconds (default 2 seconds).

As in all pmview(1) scenes, when the mouse is moved over one of the bars, the current value and metric information for that bar will be shown in the text box near the top of the display. The height of the bars is proportional to the performance metric values relative to the maximum, as controlled by size of the URLs being fetched by pmdawebping(1), and the -m option (see below).

The bars in the webpingvis scene represent the following information:

Size

The green bars indicate the relative sizes of the results returned for each URL in the pmdawebping workload.

Response

For each URL in the pmdawebping workload, the components of the Web server response-time (connect, head and body) and the total response-time is displayed.

Errors

The four red error bars indicate the number of socket, HTTP, HTML or other errors that occurred in the last iteration of the pmdawebping workload. Any of these errors will terminate the request for a URL.

webpingvis uses pmview(1), and so the user interface follows that described for pmview(1), which in turn displays the scene within an Inventor examiner viewer. For generic control of the viewer, see ivview(1).

webpingvis passes most command line options to pmview(1). Therefore, the command line options -A, -a, -C, -h, -n, -O, -p, -S, -t, -T, -x, -Z and -z, and the user interface are described in the pmview(1) man page.

Options specific to webpingvis are:

-i

The URL names are not included as labels in the scene by default. The -i option forces them to be included.

-m max

Change the normalization factor for the response-time bars. The value for max is in units of milliseconds, and should be the expected maximum value for the total response-time aggregated over all URLs in the pmdawebping workload. The default value is 1000 milliseconds.

-V

The derived configuration file for pmview(1) is written on standard output. This may be saved and used directly with pmview(1) if the user wishes to customize the display, or modify some of the normalization parameters.

CAVEATS¶

As webpingvis sorts the configured URLs by size, running webpingvis shortly after starting pmdawebping(1) may result in the URLs being sorted incorrectly as they may not have been fetched.

The ~ character may not be parsed correctly by pmview(1). Therefore, if pmdawebping(1) is fetching any URLs containing ~ then webpingvis will not launch.

FILES¶

$PCP_VAR_DIR/pmns/*

default PMNS specification files

$PCP_VAR_DIR/config/pmlogger/config.webpingvis

pmlogger(1) configuration file that can be used to create a PCP archive suitable for display with webpingvis

$PCP_VAR_DIR/config/pmchart/Web.Response

A pmchart(1) configuration file for monitoring Web server response time

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(4).

SEE ALSO¶

pmcd(1), pmchart(1), pmdawebping(1), pmdumplog(1), pminfo(1), pmlogger(1), pmval(1), pmview(1), weblogvis(1) and webvis(1).