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 displays 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 disambiguate 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 5.0 second measurement interval. --out output_file turbostat output is written to the specified output_file. The file is truncated if it already exists, and it is created if it does not exist. --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. Bzy_MHz average clock rate while the CPU was busy (in "c0" state). TSC_MHz average MHz that the TSC ran during the entire interval.
DEBUG FIELD DESCRIPTIONS
Package processor package number. Core processor core number. Note that multiple CPUs per core indicate support for Intel(R) Hyper-Threading Technology (HT). CPU%c1, CPU%c3, CPU%c6, CPU%c7 show the percentage residency in hardware core idle states. CoreTmp Degrees Celsius reported by the per-core Digital Thermal Sensor. PkgTtmp Degrees Celsius reported by the per-package Package Thermal Monitor. Pkg%pc2, Pkg%pc3, Pkg%pc6, Pkg%pc7 percentage residency in hardware package idle states. PkgWatt Watts consumed by the whole package. 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.
PERIODIC EXAMPLE
Without any parameters, turbostat displays statistics ever 5 seconds.
Periodic output goes to stdout, by default, unless --out is used to
specify an output file. The 5-second interval can be changed with th
"-i sec" option. Or a command may be specified as in "FORK EXAMPLE"
below.
[root@hsw]# ./turbostat
CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- 488 12.51 3898 3498
0 0 0.01 3885 3498
4 3897 99.99 3898 3498
1 0 0.00 3861 3498
5 0 0.00 3882 3498
2 1 0.02 3894 3498
6 2 0.06 3898 3498
3 0 0.00 3849 3498
7 0 0.00 3877 3498
DEBUG EXAMPLE
The "--debug" option prints additional system information before
measurements:
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.
turbostat version 4.1 10-Feb, 2015 - Len Brown <lenb@kernel.org>
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_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)
cpu0: Cores Limit: DISabled (0.000000 Watts, 0.000977 sec, clamp DISabled)
cpu0: MSR_PP1_POLICY: 0
cpu0: MSR_PP1_POWER_LIMIT: 0x00000000 (UNlocked)
cpu0: GFX Limit: DISabled (0.000000 Watts, 0.000977 sec, clamp DISabled)
cpu0: MSR_IA32_TEMPERATURE_TARGET: 0x00641400 (100 C)
cpu0: MSR_IA32_PACKAGE_THERM_STATUS: 0x88340800 (48 C)
cpu0: MSR_IA32_THERM_STATUS: 0x88340000 (48 C +/- 1)
cpu1: MSR_IA32_THERM_STATUS: 0x88440000 (32 C +/- 1)
cpu2: MSR_IA32_THERM_STATUS: 0x88450000 (31 C +/- 1)
cpu3: MSR_IA32_THERM_STATUS: 0x88490000 (27 C +/- 1)
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz SMI CPU%c1 CPU%c3 CPU%c6 CPU%c7 CoreTmp PkgTmp PkgWatt CorWatt GFXWatt
- - 493 12.64 3898 3498 0 12.64 0.00 0.00 74.72 47 47 21.62 13.74 0.00
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 after the command exits. In this case,
turbostat output goes to stderr, by default. Output can instead be
saved to a file using the --out option. 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@hsw: turbostat cat /dev/zero > /dev/null
^C
CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- 482 12.51 3854 3498
0 0 0.01 1960 3498
4 0 0.00 2128 3498
1 0 0.00 3003 3498
5 3854 99.98 3855 3498
2 0 0.01 3504 3498
6 3 0.08 3884 3498
3 0 0.00 2553 3498
7 0 0.00 2126 3498
10.783983 sec
Above the cycle soaker drives cpu5 up its 3.9 GHz turbo limit. The
first row shows the average MHz and Busy% across all the processors in
the system.
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 executing -- 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 # chmod +r /dev/cpu/*/msr turbostat reads hardware counters, but doesn't write them. So it will not interfere with the OS or other programs, including multiple invocations of itself. turbostat may work poorly on Linux-2.6.20 through 2.6.29, as acpi- cpufreq periodically cleared the APERF and MPERF MSRs in those kernels. AVG_MHz = APERF_delta/measurement_interval. This is the actual number of elapsed cycles divided by the entire sample interval -- including idle time. Note that this calculation is resilient to systems lacking a non-stop TSC. 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 architecture, 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 <len.brown@intel.com>
TURBOSTAT(8)
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