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PMSTAT(1)										PMSTAT(1)

NAME
       pmstat - high-level system performance overview

SYNOPSIS
       pmstat [-gLlPxz] [-A align] [-a archive] [-h host] [-H file] [-n pmnsfile] [-O offset] [-p
       port] [-S starttime] [-s samples] [-T endtime] [-t interval] [-Z timezone]

DESCRIPTION
       pmstat provides a one line summary of system performance every interval unit of time  (the
       default	is  5  seconds).  pmstat is intended to monitor system performance at the highest
       level, after which other tools may be used to examine subsystems in which  potential  per-
       formance problems may be observed in greater detail.

       Multiple  hosts	may  be  monitored by supplying more than one host with multiple -h flags
       (for live monitoring) or by providing a name of the hostlist file, where each line contain
       one  host  name,  with  -H, or multiple -a flags (for retrospective monitoring from an ar-
       chive).

       The -t option may be used to change the default reporting interval.  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).

       By default, pmstat fetches metrics by connecting to the Performance Metrics Collector Dae-
       mon  (PMCD)  on	the local host.  If the -L option is specified, then pmcd(1) is bypassed,
       and metrics are fetched from PMDAs on the local host using the standalone PM_CONTEXT_LOCAL
       variant	of  pmNewContext(3).   When  the  -h  option is specified, pmstat connects to the
       pmcd(1) on host and fetches metrics from there.	As mentioned above, multiple hosts may be
       monitored by supplying multiple -h flags.

       Alternatively,  if  the	-a option is used, the metrics are retrieved from the Performance
       Co-Pilot archive log files identified by the base name archive.	Multiple archives may  be
       replayed  by  supplying multiple -a flags.  When the -a flag is used, the -P flag may also
       be used to pause the output after each interval.

       Standalone mode can only connect to the local host, using an archive implies a host  name,
       and  nominating	a host precludes using an archive, so the options -L, -a and -h are mutu-
       ally exclusive.

       Normally pmstat operates on the default Performance Metrics Name Space (PMNS), however  if
       the -n option is specified an alternative namespace is loaded from the file pmnsfile.

       If  the	-s the option is specified, samples defines the number of samples to be retrieved
       and reported.  If samples is 0 or -s is not specified, pmstat will sample and report  con-
       tinuously - this is the default behavior.

       When processing an archive, pmstat may relinquish its own timing control, and operate as a
       ``slave'' of a pmtime(1) process that uses a GUI dialog to  provide  timing  control.   In
       this  case, either the -g option should be used to start pmstat as the sole slave of a new
       pmtime(1) instance, or -p should be  used  to  attach  pmstat  to  an  existing	pmtime(1)
       instance via the IPC channel identified by the port argument.

       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''  align-
       ment  of  the  sample  times;  refer  to  PCPIntro(1)  for a complete description of these
       options.

       The -l option prints the last 7 characters of a hostname in summaries involving more  than
       one host (when more than one -h option has been specified on the command line).

       The  -x	option	(extended  CPU metrics) causes two additional CPU metrics to be reported,
       namely wait for I/O ("wa") and virtualisation steal time ("st").

       The output from pmstat is directed to standard output, and the columns in the  report  are
       interpreted as follows:

       loadavg	 The 1 minute load average.

       memory	 The  swpd  column  indicates  average	swap  space  used during the interval, in
		 Kbytes.  The free column indicates average free memory during the  interval,  in
		 Kbytes.   The	buff  column  indicates  average  buffer memory in use during the
		 interval, in Kbytes.  The cache column indicates average cached  memory  in  use
		 during the interval, in Kbytes.

		 If  the values become large, they are reported as Mbytes (m suffix) or Gbytes (g
		 suffix).

       swap	 The metrics in this area of the kernel instrumentation are of varying value.  We
		 try  to  report  the average number of pages that are paged in (pi) and out (po)
		 per second during the interval.  If the corresponding page swapping metrics  are
		 unavailable,  we  report  the average rate per second of swap operations in (si)
		 and out (so) during the interval.  It is normal for the ``in'' values to be non-
		 zero,	but  the system is suffering memory stress if the ``out'' values are non-
		 zero over an extended period.

		 If the values become large, they are reported as  thousands  of  operations  per
		 second (K suffix) or millions of operations per second (M suffix).

       io	 The  bi  and  bo columns indicate the average rate per second of block input and
		 block output operations (respectfully) during the  interval.	Unless	all  file
		 systems  have	a 1 Kbyte block size, these rates do not directly indicate Kbytes
		 transferred.

		 If the values become large, they are reported as  thousands  of  operations  per
		 second (K suffix) or millions of operations per second (M suffix).

       system	 Interrupt  rate (in) and context switch rate (cs).  Rates are expressed as aver-
		 age operations per second during the interval.  Note that the interrupt rate  is
		 normally at least HZ (the clock interrupt rate, usually 100) interrupts per sec-
		 ond.

		 If the values become large, they are reported as  thousands  of  operations  per
		 second (K suffix) or millions of operations per second (M suffix).

       cpu	 Percentage  of  CPU  time spent executing user and "nice user" code (us), system
		 and interrupt processing code (sy), idle loop (id).

       If any values for the associated performance metrics are unavailable, the value appears as
       ``?'' in the output.

       By  default,  pmstat reports the time of day according to the local timezone on the system
       where pmstat is run.  The -Z option changes the timezone to timezone in the format of  the
       environment variable TZ as described in environ(5).  The -z option changes the timezone to
       the local timezone at the host that is the source of the performance metrics,  as  identi-
       fied via either the -h or -a options.

FILES
       $PCP_VAR_DIR/pmns/*
		 default PMNS specification files
       $PCP_SYSCONF_DIR/pmlogger/config.pmstat
		 pmlogger(1)  configuration  for  creating  an	archive  suitable for replay with
		 pmstat

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 config-
       uration file, as described in pcp.conf(5).

SEE ALSO
       PCPIntro(1),   pmclient(1),   pmtime(1),   PMAPI(3),   pmNewContext(3),	 pcp.conf(5)  and
       pcp.env(5).

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

Performance Co-Pilot			       PCP					PMSTAT(1)
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