cpupower-monitor man page on Oracle

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       cpupower-monitor - Report processor frequency and idle statistics

       cpupower monitor -l

       cpupower monitor [-c][-m <mon1>,[<mon2>,...]]  [-i seconds]
       cpupower monitor [-c][-m <mon1>,[<mon2>,...]]  command

       cpupower-monitor	  reports processor topology, frequency and idle power
       state statistics. Either command is forked and statistics  are  printed
       upon its completion, or statistics are printed periodically.

       cpupower-monitor	 implements independent processor sleep state and fre‐
       quency counters. Some are retrieved from kernel	statistics,  some  are
       directly	 reading  out  hardware	 registers.  Use -l to get an overview
       which are supported on your system.

	   List available monitors on your system.  Additional	details	 about
	   each monitor are shown:

	     ·	    The	 name in quotation marks which can be passed to the -m

	     ·	    The number of different counters the monitor  supports  in

	     ·	    The amount of time in seconds the counters might overflow,
		    due to implementation constraints.

	     ·	    The name and a description of each counter and its proces‐
		    sor hierarchy level coverage in square brackets:

		 ·	[T] -> Thread

		 ·	[C] -> Core

		 ·	[P] -> Processor Package (Socket)

		 ·	[M] -> Machine/Platform wide counter

       -m <mon1>,<mon2>,...
	   Only	 display specific monitors. Use the monitor string(s) provided
	   by -l option.

       -i seconds
	   Measure intervall.

	   Schedule the process on every core before starting and ending  mea‐
	   suring.   This  could  be needed for the Idle_Stats monitor when no
	   other MSR based monitor (has to be run on the  core	that  is  mea‐
	   sured)  is run in parallel.	This is to wake up the processors from
	   deeper sleep states and let the kernel re -account its cpuidle  (C-
	   state) information before reading the cpuidle timings from sysfs.

	   Measure  idle  and  frequency  characteristics of an arbitrary com‐
	   mand/workload.  The executable command is forked and upon its exit,
	   statistics gathered since it was forked are displayed.

	   Increase verbosity if the binary was compiled with the DEBUG option

       Shows statistics of the cpuidle kernel subsystem. Values are  retrieved
       from  /sys/devices/system/cpu/cpu*/cpuidle/state*/.  The kernel updates
       these values every time an idle state is	 entered  or  left.  Therefore
       there  can  be some inaccuracy when cores are in an idle state for some
       time when the measure starts or ends. In worst case it can happen  that
       one  core  stayed  in  an idle state for the whole measure time and the
       idle state usage time as exported by the kernel did not get updated. In
       this case a state residency of 0 percent is shown while it was 100.

       The name comes from the aperf/mperf (average and maximum) MSR registers
       used which are available on recent X86 processors. It shows the average
       frequency  (including  boost frequencies).  The fact that on all recent
       hardware the mperf timer stops ticking in any idle  state  it  is  also
       used to show C0 (processor is active) and Cx (processor is in any sleep
       state) times. These counters do not have	 the  inaccuracy  restrictions
       the  "Idle_Stats"  counters  may show.  May work poorly on Linux-2.6.20
       through 2.6.29, as the acpi-cpufreq kernel  frequency  driver  periodi‐
       cally cleared aperf/mperf registers in those kernels.

   Nehalem SandyBridge HaswellExtended
       Intel  Core  and	 Package sleep state counters.	Threads (hyperthreaded
       cores) may not be able to enter deeper core states if  its  sibling  is
       utilized.   Deepest  package  sleep  states  may	 in reality show up as
       machine/platform wide sleep states and can only be entered if all cores
       are  idle.  Look	 up Intel manuals (some are provided in the References
       section) for further details.  The monitors are	named  after  the  CPU
       family  where  the  sleep state capabilities got introduced and may not
       match exactly the CPU name of the platform.  For example	 an  IvyBridge
       processor  has sleep state capabilities which got introduced in Nehalem
       and SandyBridge processor families.  Thus on an IvyBridge processor one
       will get Nehalem and SandyBridge sleep state monitors.  HaswellExtended
       extra package sleep state capabilities are available only in a specific
       Haswell (family 0x45) and probably also other future processors.

   Fam_12h Fam_14h
       AMD laptop and desktop processor (family 12h and 14h) sleep state coun‐
       ters.  The registers are accessed via PCI and therefore	can  still  be
       read out while cores have been offlined.

       There  is one special counter: NBP1 (North Bridge P1).  This one always
       returns 0 or 1, depending on whether the North Bridge  P1  power	 state
       got  entered  at	 least	once during measure time.  Being able to enter
       NBP1 state also depends on graphics power management.   Therefore  this
       counter	can  be used to verify whether the graphics' driver power man‐
       agement is working as expected.

       cpupower monitor -l" may show:
	   Monitor "Mperf" (3 states) - Might overflow after 922000000 s


	   Monitor "Idle_Stats" (3 states) - Might overflow after 4294967295 s


       cpupower monitor -m "Idle_Stats,Mperf" scp /tmp/test /nfs/tmp

       Monitor the scp command, show both Mperf and Idle_Stats states  counter
       statistics, but in exchanged order.

       Be careful that the typical command to fully utilize one CPU by doing:

       cpupower monitor cat /dev/zero >/dev/null

       Does not work as expected, because the measured output is redirected to
       /dev/null. This could get workarounded by putting the line into an own,
       tiny shell script. Hit CTRL-c to terminate the command and get the mea‐
       sure output displayed.

       "BIOS and Kernel Developer’s Guide (BKDG) for AMD  Family  14h  Proces‐
       sors" http://support.amd.com/us/Processor_TechDocs/43170.pdf

       "Intel®	Turbo  Boost  Technology  in  Intel®  Core™  Microarchitecture
       (Nehalem)  Based	 Processors"  http://download.intel.com/design/proces‐

       "Intel®	64  and IA-32 Architectures Software Developer's Manual Volume
       3B:  System  Programming	 Guide"	 http://www.intel.com/products/proces‐


       powertop(8), msr(4), vmstat(8)

       Written by Thomas Renninger <trenn@suse.de>

       Nehalem, SandyBridge monitors and command passing
       based on turbostat.8 from Len Brown <len.brown@intel.com>

				  22/02/2011		   CPUPOWER-MONITOR(1)

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