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TURBOSTAT(8)                                   System Manager's Manual                                   TURBOSTAT(8)



NAME
       turbostat - Report processor frequency and idle statistics

SYNOPSIS
       turbostat [Options] command
       turbostat [Options] [--interval seconds]

DESCRIPTION
       turbostat   reports  processor  topology, frequency, idle power-state statistics, temperature and power on X86
       processors.  There are two ways to invoke turbostat.  The first method is to supply a command, which is forked
       and  statistics are printed upon its completion.  The second method is to omit the command, and turbostat dis‐
       plays statistics every 5 seconds.  The 5-second interval can be changed using the --interval option.

       Some information is not available on older processors.

   Options
       Options can be specified with a single or double '-', and only as much of the option name as necessary to dis‐
       ambiguate  it from others is necessary.  Note that options are case-sensitive.  --Counter MSR# shows the delta
       of the specified 64-bit MSR counter.

       --counter MSR# shows the delta of the specified 32-bit MSR counter.

       --Dump displays the raw counter values.

       --debug displays additional system configuration information.  Invoking this parameter more than once may also
       enable internal turbostat debug information.

       --interval seconds overrides the default 5-second measurement interval.

       --help displays usage for the most common parameters.

       --Joules displays energy in Joules, rather than dividing Joules by time to print power in Watts.

       --MSR MSR# shows the specified 64-bit MSR value.

       --msr MSR# shows the specified 32-bit MSR value.

       --Package limits output to the system summary plus the 1st thread in each Package.

       --processor limits output to the system summary plus the 1st thread in each processor of each package.  Ie. it
       skips hyper-threaded siblings.

       --Summary limits output to a 1-line System Summary for each interval.

       --TCC temperature sets the Thermal Control Circuit temperature for systems which do  not  export  that  value.
       This  is used for making sense of the Digital Thermal Sensor outputs, as they return degrees Celsius below the
       TCC activation temperature.

       --version displays the version.

       The command parameter forks command, and upon its exit, displays the statistics gathered since it was forked.

DEFAULT FIELD DESCRIPTIONS
       CPU Linux CPU (logical processor) number.  Yes, it is okay that on many systems the CPUs are not listed in numerical order -- for efficiency reasons, turbostat runs in topology order, so HT siblings appear together.
       AVG_MHz number of cycles executed divided by time elapsed.
       %Busy percent of the interval that the CPU retired instructions, aka. % of time in "C0" state.
       CorWatt Watts consumed by the core part of the package.
       GFXWatt Watts consumed by the Graphics part of the package -- available only on client processors.
       RAMWatt Watts consumed by the DRAM DIMMS -- available only on server processors.
       PKG_% percent of the interval that RAPL throttling was active on the Package.
       RAM_% percent of the interval that RAPL throttling was active on DRAM.

EXAMPLE
       Without any parameters, turbostat displays statistics ever  5  seconds.   (override  interval  with  "-i  sec"
       option, or specify a command for turbostat to fork).

       The  first  row  of  statistics is a summary for the entire system.  For residency % columns, the summary is a
       weighted average.  For Temperature columns, the summary is the column maximum.  For Watts columns, the summary
       is a system total.  Subsequent rows show per-CPU statistics.

       [root@ivy]# ./turbostat
           Core     CPU Avg_MHz   %Busy Bzy_MHz TSC_MHz     SMI  CPU%c1  CPU%c3  CPU%c6  CPU%c7 CoreTmp  PkgTmp Pkg%pc2 Pkg%pc3 Pkg%pc6 Pkg%pc7 PkgWatt CorWatt GFXWatt
              -       -       6    0.36    1596    3492       0    0.59    0.01   99.04    0.00      23      24   23.82    0.01   72.47    0.00    6.40    1.01    0.00
              0       0       9    0.58    1596    3492       0    0.28    0.01   99.13    0.00      23      24   23.82    0.01   72.47    0.00    6.40    1.01    0.00
              0       4       1    0.07    1596    3492       0    0.79
              1       1      10    0.65    1596    3492       0    0.59    0.00   98.76    0.00      23
              1       5       5    0.28    1596    3492       0    0.95
              2       2      10    0.66    1596    3492       0    0.41    0.01   98.92    0.00      23
              2       6       2    0.10    1597    3492       0    0.97
              3       3       3    0.20    1596    3492       0    0.44    0.00   99.37    0.00      23
              3       7       5    0.31    1596    3492       0    0.33

DEBUG EXAMPLE
       The "--debug" option prints additional system information before measurements:

       turbostat version 4.1 10-Feb, 2015 - Len Brown <[email protected]>
       CPUID(0): GenuineIntel 13 CPUID levels; family:model:stepping 0x6:3c:3 (6:60:3)
       CPUID(6): APERF, DTS, PTM, EPB
       RAPL: 3121 sec. Joule Counter Range, at 84 Watts
       cpu0: MSR_NHM_PLATFORM_INFO: 0x80838f3012300
       8 * 100 = 800 MHz max efficiency
       35 * 100 = 3500 MHz TSC frequency
       cpu0: MSR_IA32_POWER_CTL: 0x0004005d (C1E auto-promotion: DISabled)
       cpu0: MSR_NHM_SNB_PKG_CST_CFG_CTL: 0x1e000400 (UNdemote-C3, UNdemote-C1, demote-C3, demote-C1, UNlocked: pkg-cstate-limit=0: pc0)
       cpu0: MSR_NHM_TURBO_RATIO_LIMIT: 0x25262727
       37 * 100 = 3700 MHz max turbo 4 active cores
       38 * 100 = 3800 MHz max turbo 3 active cores
       39 * 100 = 3900 MHz max turbo 2 active cores
       39 * 100 = 3900 MHz max turbo 1 active cores
       cpu0: MSR_IA32_ENERGY_PERF_BIAS: 0x00000006 (balanced)
       cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x31200000 (Active: ) (Logged: Auto-HWP, Amps, MultiCoreTurbo, Transitions, )
       cpu0: MSR_GFX_PERF_LIMIT_REASONS, 0x00000000 (Active: ) (Logged: )
       cpu0: MSR_RING_PERF_LIMIT_REASONS, 0x0d000000 (Active: ) (Logged: Amps, PkgPwrL1, PkgPwrL2, )
       cpu0: MSR_RAPL_POWER_UNIT: 0x000a0e03 (0.125000 Watts, 0.000061 Joules, 0.000977 sec.)
       cpu0: MSR_PKG_POWER_INFO: 0x000002a0 (84 W TDP, RAPL 0 - 0 W, 0.000000 sec.)
       cpu0: MSR_PKG_POWER_LIMIT: 0x428348001a82a0 (UNlocked)
       cpu0: PKG Limit #1: ENabled (84.000000 Watts, 8.000000 sec, clamp DISabled)
       cpu0: PKG Limit #2: ENabled (105.000000 Watts, 0.002441* sec, clamp DISabled)
       cpu0: MSR_PP0_POLICY: 0
       cpu0: MSR_PP0_POWER_LIMIT: 0x00000000 (UNlocked)

              0       0       4    0.11    3894    3498       0   99.89    0.00    0.00    0.00      47      47   21.62   13.74    0.00
              0       4    3897   99.98    3898    3498       0    0.02
              1       1       7    0.17    3887    3498       0    0.04    0.00    0.00   99.79      32
              1       5       0    0.00    3885    3498       0    0.21
              2       2      29    0.76    3895    3498       0    0.10    0.01    0.01   99.13      32
              2       6       2    0.06    3896    3498       0    0.80
              3       3       1    0.02    3832    3498       0    0.03    0.00    0.00   99.95      28
              3       7       0    0.00    3879    3498       0    0.04
       ^C

       The  max  efficiency  frequency,  a.k.a. Low Frequency Mode, is the frequency available at the minimum package
       voltage.  The TSC frequency is the base frequency of the processor -- this should match the  brand  string  in
       /proc/cpuinfo.   This  base  frequency should be sustainable on all CPUs indefinitely, given nominal power and
       cooling.  The remaining rows show what maximum turbo frequency is possible depending on  the  number  of  idle
       cores.  Note that not all information is available on all processors.

       The  --debug option adds additional columns to the measurement ouput, including CPU idle power-state residency
       processor temperature sensor readinds.  See the field definitions above.

FORK EXAMPLE
       If turbostat is invoked with a command, it will fork that command and output the statistics gathered when  the
       command  exits.   eg. Here a cycle soaker is run on 1 CPU (see %c0) for a few seconds until ^C while the other
       CPUs are mostly idle:

       root@ivy: turbostat cat /dev/zero > /dev/null
       ^C
           Core     CPU Avg_MHz   %Busy Bzy_MHz TSC_MHz     SMI  CPU%c1  CPU%c3  CPU%c6  CPU%c7 CoreTmp  PkgTmp Pkg%pc2 Pkg%pc3 Pkg%pc6 Pkg%pc7 PkgWatt CorWatt GFXWatt
              -       -     496   12.75    3886    3492       0   13.16    0.04   74.04    0.00      36      36    0.00    0.00    0.00    0.00   23.15   17.65    0.00
              0       0      22    0.57    3830    3492       0    0.83    0.02   98.59    0.00      27      36    0.00    0.00    0.00    0.00   23.15   17.65    0.00
              0       4       9    0.24    3829    3492       0    1.15
              1       1       4    0.09    3783    3492       0   99.91    0.00    0.00    0.00      36
              1       5    3880   99.82    3888    3492       0    0.18
              2       2      17    0.44    3813    3492       0    0.77    0.04   98.75    0.00      28
              2       6      12    0.32    3823    3492       0    0.89
              3       3      16    0.43    3844    3492       0    0.63    0.11   98.84    0.00      30
              3       7       4    0.11    3827    3492       0    0.94
       30.372243 sec

       Above the cycle soaker drives cpu5 up its 3.8 GHz turbo limit while the other processors are generally in var‐
       ious states of idle.

       Note  that  cpu1  and cpu5 are HT siblings within core1.  As cpu5 is very busy, it prevents its sibling, cpu1,
       from entering a c-state deeper than c1.

       Note that the Avg_MHz column reflects the total number of cycles executed divided by the measurement interval.
       If  the  %Busy  column is 100%, then the processor was running at that speed the entire interval.  The Avg_MHz
       multiplied by the %Busy results in the Bzy_MHz -- which is the average frequency while the processor was  exe‐
       cuting -- not including any non-busy idle time.


NOTES
       turbostat must be run as root.  Alternatively, non-root users can be enabled to run turbostat this way:

       # setcap cap_sys_rawio=ep ./turbostat

       TSC_MHz  = TSC_delta/measurement_interval.  On a system with an invariant TSC, this value will be constant and
       will closely match the base frequency value shown in the brand string in /proc/cpuinfo.  On a system where the
       TSC stops in idle, TSC_MHz will drop below the processor's base frequency.

       %Busy = MPERF_delta/TSC_delta

       Bzy_MHz = TSC_delta/APERF_delta/MPERF_delta/measurement_interval

       Note  that  these  calculations depend on TSC_delta, so they are not reliable during intervals when TSC_MHz is
       not running at the base frequency.

       Turbostat data collection is not atomic.  Extremely short measurement intervals (much less than 1 second),  or
       system  activity  that  prevents  turbostat  from  being able to run on all CPUS to quickly collect data, will
       result in inconsistent results.

       The APERF, MPERF MSRs are defined to count non-halted cycles.  Although it is not guaranteed by the  architec‐
       ture, turbostat assumes that they count at TSC rate, which is true on all processors tested to date.


REFERENCES
       Volume 3B: System Programming Guide" http://www.intel.com/products/processor/manuals/


FILES
       /dev/cpu/*/msr


SEE ALSO
       msr(4), vmstat(8)

AUTHOR
       Written by Len Brown <[email protected]>



                                                                                                         TURBOSTAT(8)