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cpustat(1M)

NAME
   cpustat - monitor system behavior using CPU performance
   counters

SYNOPSIS
   cpustat -c eventspec [-c eventspec]... [-ntD] [ interval [count]]

   cpustat -h

DESCRIPTION
   The cpustat utility allows CPU performance counters to be
   used to monitor the overall behavior of the CPUs in the system.

   If interval is specified, cpustat samples activity every
   interval seconds, repeating forever. If a count is speci-
   fied, the statistics are repeated count times. If neither
   are specified, an interval of five seconds is used, and
   there is no limit to the number of samples that will be
   taken.

OPTIONS
   The following options are supported:
   -c eventspec
      Specifies a set of events for the CPU performance
      counters to monitor. The syntax of these event specif-
      ication can be determined using the -h option to cause
      the usage message to be generated. The semantics of
      these event specifications can be determined by reading
      the CPU manufacturers documentation for the events.
      See cpc_strtoevent(3CPC) for description of the syntax.

      Multiple -c options may be specified, in which case
      the command cycles between the different event set-
      tings on each sample.

   -D  Enables debug mode.

   -h  Prints an extensive help message on how to use the
      utility and how to program the processor-dependent
      counters.

   -n  Omits all header output (useful if cpustat is the
      beginning of a pipeline).



   -t  Prints an additional column of processor cycle counts,
      if available on the current architecture.

USAGE
   A closely related utility, cputrack(1), can be used to moni-
   tor the behavior of individual applications with little or
   no interference from other activities on the system.

   The cpustat utility must be run by the super-user, as there
   is an intrinsic conflict between the use of the CPU perfor-
   mance counters system-wide by cpustat and the use of the CPU
   performance counters to monitor an individual process (for
   example, by cputrack.)

   Once any instance of this utility has started, no further
   per-process or per-LWP use of the counters is allowed until
   the last instance of the utility terminates.

   The times printed by the command correspond to the wallclock
   time when the hardware counters were actually sampled,
   instead of when the program told the kernel to sample them.
   The time is derived from the same timebase as gethrtime(3C).

   The processor cycle counts enabled by the -t option always
   apply to both user and system modes, regardless of the set-
   tings applied to the performance counter registers.

   On some hardware platforms, the counters are implemented
   using 32-bit registers. While the kernel attempts to catch
   all overflows to synthesize 64-bit counters, because of
   hardware implementation restrictions, overflows may be lost
   unless the sampling interval is kept short enough. The
   events most prone to wrap are those that count processor
   clock cycles. If such an event is of interest, sampling
   should occur frequently so that less than 4 billion clock
   cycles can occur between samples.

The output of cpustat is designed to be readily parseable by
   nawk(1) and perl(1), thereby allowing performance tools to
   be composed by embedding cpustat in scripts. Alternatively,
   tools may be constructed directly using the same APIs that
   cpustat is built upon using the facilities of libcpc(3LIB).
   See cpc(3CPC).

   The cpustat utility only monitors the CPUs that are accessi-
   ble to it in the current processor set. Thus, several
   instances of the utility can be running on the CPUs in dif-
   ferent processor sets. See psrset(1M) for more information
   about processor sets.

Because cpustat uses LWPs bound to CPUs, the utility may
   have to be terminated before the configuration of the
   relevant processor can be changed.
WARNINGS
   By running the cpustat command, the super-user will forcibly
   invalidate all existing performance counter context. This
   may in turn cause all invocations of the cputrack command,
   and other users of performance counter context, to exit
   prematurely with unspecified errors.

   If cpustat is invoked on a system that has CPU performance
   counters, but on which the packages containing the kernel
   support for those counters is not installed, the following
   message appears:

   cpustat: CPU performance counters are inaccessible on this
   machine.

   This error message implies that cpc_access() has failed and
   is documented in cpc_access(3CPC). Review this documentation
   for more information about the problem and possible solu-
   tions.

ATTRIBUTES
   See attributes(5) for descriptions of the following attri-
   butes:

   ____________________________________________________________
  |    ATTRIBUTE TYPE    |    ATTRIBUTE VALUE    |
  |_____________________________|_____________________________|
  | Availability        | SUNWcpcu          |
  |_____________________________|_____________________________|
  | Interface Stability     | Evolving          |
  |_____________________________|_____________________________|

SEE ALSO
   cputrack(1), nawk(1), perl(1),  iostat(1M),  prstat(1M),
   psrset(1M),  vmstat(1M),  cpc(3CPC),  cpc_access(3CPC),
   cpc_strtoevent(3CPC), gethrtime(3C), libcpc(3LIB), attri-
   butes(5)

   Sun Microelectronics UltraSPARC I&II User's Manual, January
   1997, STP1031, http://www.sun.com/sparc

   Intel Architecture Software Developer's Manual, Volume 3:
   System Programmers Guide, 243192, http://developer.intel.com
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