NAME¶

pmlogsummary - calculate averages of metrics stored in a PCP archive

SYNOPSIS¶

pmlogsummary [-abfFHiIlmMNsvxyz] [-B nbins] [-n pmnsfile] [-p precision] [-S starttime] [-T endtime] [-Z timezone] archive [metricname ...]

DESCRIPTION¶

pmlogsummary prints statistical information about metrics of numeric type contained within the files of a Performance Co-Pilot (PCP) archive log. The default output prints time averages for both counter and non-counter metrics. The archive log has the base name archive, typically created using pmlogger(1).

The metrics of interest are named in the metricname arguments. If metricname is a non-leaf node in the Performance Metrics Name Space (pmns(5)), then pmlogsummary will recursively descend the PMNS and report on all leaf nodes. If no metricname argument is given, the root of the namespace is used.

Normally pmlogsummary operates on the default pmns(5), however if the -n option is specified an alternative namespace is loaded from the file pmnsfile.

The command line options -S and -T can be used to specify a time window over which metrics should be summarized. These options are common to most Performance Co-Pilot tools and are fully described in PCPIntro(1).

The remaining options control the specific information to be reported. Metrics with counter semantics are converted to rates before being evaluated.

-a

Print all information. This is equivalent to -blmMy.

-b

Print both forms of averaging, that is both stochastic and time averaging.

-B

Print the approximate distribution of values, using histogram bins such that the value range (minimum - maximum) for each metric is divided equally into nbins bins, and each bin accumulates the frequency of observed values in the corresponding range. Refer to the ``OUTPUT FORMAT'' section below for a description of how the distribution of values is reported).

-f

Spreadsheet format - the tab character is used to delimit each field printed. This option is intended to allow pmlogsummary output to be imported directly into common spreadsheet applications.

-F

Spreadsheet format - the comma character is used to delimit each field printed. This option is intended to allow pmlogsummary output to be imported directly into common spreadsheet applications which support the Comma Separated Value (.csv) format.

-H

Print a one-line header at the start showing what each field represents.

-l

Also print the archive label, showing the log format version, the time and date for the start and end of the archive time window, and the host from which the performance metrics values were collected.

-i

Also print the time at which the minimum value was logged. The format of this timestamp is described in the ``OUTPUT FORMAT'' section below.

-I

Also print the time at which the maximum value was logged. The format of this timestamp is described in the ``OUTPUT FORMAT'' section below.

-m

Also print the minimum logged value for each metric.

-M

Also print the maximum logged value for each metric.

-s

Print (only) the sum of all logged values for each metric.

-N

Suppress any warnings resulting from individual archive fetches (default).

-p

Print all floating point numbers with precision digits after the decimal place.

-v

Report (verbosely) on warnings resulting from individual archive fetches.

-x

Print stochastic averages instead of the default (time averages).

-y

Also print the number of samples encountered in the archive for each metric.

By default, pmlogsummary reports the time of day according to the local timezone on the system where pmlogsummary is run. The -Z option changes the timezone to timezone in the format of the environment variable TZ as described in environ(7). The -z option changes the timezone to the local timezone at the host that is the source of the performance metrics, as specified in the label record of the archive log.

OUTPUT FORMAT¶

The pmlogsummary output format is spartan as it is intended to be post-processed with standard tools. This means that there is no annotation associated with each output field which would make processing harder. The intention is that pmlogsummary output be massaged into a format which can be used by a spreadsheet program, is suitable for inclusion in a web page, or whatever.

For each metric, pmlogsummary produces a single output line as follows:

metricname  value(s) units

For metrics with multiple instances, pmlogsummary produces multiple lines of output as follows:

metricname ["instance 1"] value(s) units
metricname ["instance 2"] value(s) units
metricname ["instance N"] value(s) units

The printed value(s) for each metric always follow this order: stochastic average, time average, minimum, minimum timestamp, maximum, maximum timestamp, count, [bin 1 range], bin 1 count, ... [bin nbins range], bin nbins count. The individual values for each metric are space-separated (unless the -f option is used).

All counter metrics which are measured in units of time will be converted to seconds before being rate converted and used in the pmlogsummary calculations. The values calculated for these metrics are also printed in seconds.

The units will be displayed in the format described by pmUnitsStr(3).

Given either of the -i or -I options, pmlogsummary produces two different timestamp formats, depending on the interval over which it is run. For an interval greater than 24 hours, the date is displayed in addition to the time at which the maxima and/or minima occurred. If the extent of the data being checked is less than 24 hours, a more precise format is used (time is displayed with millisecond precision, but without the date).

NOTES¶

The average for an individual metric is calculated as follows:

Non-counter metrics are averaged using stochastic averaging - each observation has an equal weighting towards the calculation of the average (the sum of all values divided by the total number of values, for each metric).

Counter metrics are averaged using time averaging (by default), but the -x option can be used to specify that counters be averaged using the stochastic method instead. When calculating a time average, the sum of the product of each sample value multiplied by the time difference between each sample, is divided by the total time over which that metric was logged.

Counter metrics whose measurements do not span 90% of the archive will be printed with the metric name prefixed by an asterisk (*).

EXAMPLE¶

$ pmlogsummary -aN -p 1 -B 3 surf network.interface.out.bytes
Log Label (Log Format Version 1)
Performance metrics from host www.sgi.com


  commencing Tue Jan 14 20:50:50.317 1997


  ending     Wed Jan 29 10:13:07.387 1997
network.interface.out.bytes ["xpi0"] 202831.3 202062.5 20618.7 \
	1235067.7 971 [<=425435.0] 912 [<=830251.4] 42 [<=1235067.7] \
	17 byte / sec
network.interface.out.bytes ["xpi1"] 0.0 0.0 0.0 0.0 1033 [<=0.0] \
	1033 [] 0 [] 0 byte / sec
network.interface.out.bytes ["et0"] 0.0 0.0 0.0 0.0 1033 [<=0.0] \
	1033 [] 0 [] 0 byte / sec
network.interface.out.bytes ["lo0"] 899.0 895.2 142.6 9583.1 1031 \
	[<=3289.4] 1027 [<=6436.2] 3 [<=9583.1] 1 byte / sec

A description of each field in the first line of statistical output, which describes one instance of the network.interface.out.bytes metric, follows:

FILES¶

$PCP_VAR_DIR/pmns/*

default PMNS specification files

$PCP_LOG_DIR/pmlogger/hostname

Default directory for PCP archives containing performance metric values collected from the host hostname.

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).

SEE ALSO¶

PCPIntro(1), pmchart(1), pmdumptext(1), pmlogextract(1), pmlogger(1), pmrep(1), pmval(1), PMAPI(3), pmUnitsStr(3) and pmns(5).

DIAGNOSTICS¶

All are generated on standard error and are intended to be self- explanatory.