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 sta-
tistics, 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 in one-shot upon its completion. The
second method is to omit the command, and turbostat displays statistics
every 5 seconds interval. 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 nec-
essary. Note that options are case-sensitive.
--add attributes add column with counter having specified 'attributes'.
The 'location' attribute is required, all others are optional.
location: {msrDDD | msr0xXXX | /sys/path...}
msrDDD is a decimal offset, eg. msr16
msr0xXXX is a hex offset, eg. msr0x10
/sys/path... is an absolute path to a sysfs attribute
scope: {cpu | core | package}
sample and print the counter for every cpu, core, or package.
default: cpu
size: {u32 | u64 }
MSRs are read as 64-bits, u32 truncates the displayed value to 32-bits.
default: u64
format: {raw | delta | percent}
'raw' shows the MSR contents in hex.
'delta' shows the difference in values during the measurement interval.
'percent' shows the delta as a percentage of the cycles elapsed.
default: delta
name: "name_string"
Any string that does not match a key-word above is used
as the column header.
--cpu cpu-set limit output to system summary plus the specified cpu-
set. If cpu-set is the string "core", then the system summary plus the
first CPU in each core are printed -- eg. subsequent HT siblings are
not printed. Or if cpu-set is the string "package", then the system
summary plus the first CPU in each package is printed. Otherwise, the
system summary plus the specified set of CPUs are printed. The cpu-set
is ordered from low to high, comma delimited with ".." and "-" permit-
ted to denote a range. eg. 1,2,8,14..17,21-44
--hide column do not show the specified built-in columns. May be
invoked multiple times, or with a comma-separated list of column names.
--enable column show the specified built-in columns, which are other-
wise disabled, by default. Currently the only built-in counters dis-
abled by default are "usec", "Time_Of_Day_Seconds", "APIC" and
"X2APIC". The column name "all" can be used to enable all disabled-by-
default built-in counters.
--show column show only the specified built-in columns. May be invoked
multiple times, or with a comma-separated list of column names.
--show CATEGORY --hide CATEGORY Show and hide also accept a single
CATEGORY of columns: "all", "topology", "idle", "frequency", "power",
"sysfs", "other".
--Dump displays the raw counter values.
--quiet Do not decode and print the system configuration header infor-
mation.
--interval seconds overrides the default 5.0 second measurement inter-
val.
--num_iterations num number of the measurement iterations.
--out output_file turbostat output is written to the specified out-
put_file. The file is truncated if it already exists, and it is cre-
ated 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.
--list display column header names available for use by --show and
--hide, then exit.
--Summary limits output to a 1-line System Summary for each interval.
--TCC temperature sets the Thermal Control Circuit temperature for sys-
tems 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.
ROW DESCRIPTIONS
The system configuration dump (if --quiet is not used) is followed by
statistics. The first row of the statistics labels the content of each
column (below). The second row of statistics is the system summary
line. The system summary line has a '-' in the columns for the Pack-
age, Core, and CPU. The contents of the system summary line depends on
the type of column. Columns that count items (eg. IRQ) show the sum
across all CPUs in the system. Columns that show a percentage show the
average across all CPUs in the system. Columns that dump raw MSR val-
ues simply show 0 in the summary. After the system summary row, each
row describes a specific Package/Core/CPU. Note that if the --cpu
parameter is used to limit which specific CPUs are displayed, turbostat
will still collect statistics for all CPUs in the system and will still
show the system summary for all CPUs in the system.
COLUMN DESCRIPTIONS
usec For each CPU, the number of microseconds elapsed during counter
collection, including thread migration -- if any. This counter is dis-
abled by default, and is enabled with "--enable usec", or --debug. On
the summary row, usec refers to the total elapsed time to collect the
counters on all cpus.
Time_Of_Day_Seconds For each CPU, the gettimeofday(2) value (sec-
onds.subsec since Epoch) when the counters ending the measurement
interval were collected. This column is disabled by default, and can
be enabled with "--enable Time_Of_Day_Seconds" or "--debug". On the
summary row, Time_Of_Day_Seconds refers to the timestamp following col-
lection of counters on the last CPU.
Core processor core number. Note that multiple CPUs per core indicate
support for Intel(R) Hyper-Threading Technology (HT).
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.
Package processor package number -- not present on systems with a sin-
gle processor package.
Avg_MHz number of cycles executed divided by time elapsed. Note that
this includes idle-time when 0 instructions are executed.
Busy% percent of the measurement interval that the CPU executes
instructions, aka. % of time in "C0" state.
Bzy_MHz average clock rate while the CPU was not idle (ie. in "c0"
state).
TSC_MHz average MHz that the TSC ran during the entire interval.
IRQ The number of interrupts serviced by that CPU during the measure-
ment interval. The system total line is the sum of interrupts serviced
across all CPUs. turbostat parses /proc/interrupts to generate this
summary.
SMI The number of System Management Interrupts serviced CPU during the
measurement interval. While this counter is actually per-CPU, SMI are
triggered on all processors, so the number should be the same for all
CPUs.
C1, C2, C3... The number times Linux requested the C1, C2, C3 idle
state during the measurement interval. The system summary line shows
the sum for all CPUs. These are C-state names as exported in
/sys/devices/system/cpu/cpu*/cpuidle/state*/name. While their names
are generic, their attributes are processor specific. They the system
description section of output shows what MWAIT sub-states they are
mapped to on each system.
C1%, C2%, C3% The residency percentage that Linux requested C1, C2,
C3.... The system summary is the average of all CPUs in the system.
Note that these are software, reflecting what was requested. The hard-
ware counters reflect what was actually achieved.
CPU%c1, CPU%c3, CPU%c6, CPU%c7 show the percentage residency in hard-
ware core idle states. These numbers are from hardware residency coun-
ters.
CoreTmp Degrees Celsius reported by the per-core Digital Thermal Sen-
sor.
PkgTmp Degrees Celsius reported by the per-package Package Thermal Mon-
itor.
GFX%rc6 The percentage of time the GPU is in the "render C6" state,
rc6, during the measurement interval. From
/sys/class/drm/card0/power/rc6_residency_ms.
GFXMHz Instantaneous snapshot of what sysfs presents at the end of the
measurement interval. From /sys/class/graph-
ics/fb0/device/drm/card0/gt_cur_freq_mhz.
Pkg%pc2, Pkg%pc3, Pkg%pc6, Pkg%pc7 percentage residency in hardware
package idle states. These numbers are from hardware residency coun-
ters.
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. Note that the system summary is the sum of the package throt-
tling time, and thus may be higher than 100% on a multi-package system.
Note that the meaning of this field is model specific. For example,
some hardware increments this counter when RAPL responds to thermal
limits, but does not increment this counter when RAPL responds to power
limits. Comparing PkgWatt and PkgTmp to system limits is necessary.
RAM_% percent of the interval that RAPL throttling was active on DRAM.
UncMHz uncore MHz, instantaneous sample.
TOO MUCH INFORMATION EXAMPLE
By default, turbostat dumps all possible information -- a system con-
figuration header, followed by columns for all counters. This is ideal
for remote debugging, use the "--out" option to save everything to a
text file, and get that file to the expert helping you debug.
When you are not interested in all that information, and there are sev-
eral ways to see only what you want. First the "--quiet" option will
skip the configuration information, and turbostat will show only the
counter columns. Second, you can reduce the columns with the "--hide"
and "--show" options. If you use the "--show" option, then turbostat
will show only the columns you list. If you use the "--hide" option,
turbostat will show all columns, except the ones you list.
To find out what columns are available for --show and --hide, the
"--list" option is available. Usually, the CATEGORY names above are
used to refer to groups of counters. Also, for convenience, the spe-
cial string "sysfs" can be used to refer to all of the sysfs C-state
counters at once:
sudo ./turbostat --show sysfs --quiet sleep 10
10.003837 sec
C1 C1E C3 C6 C7s C1% C1E% C3% C6% C7s%
4 21 2 2 459 0.14 0.82 0.00 0.00 98.93
1 17 2 2 130 0.00 0.02 0.00 0.00 99.80
0 0 0 0 31 0.00 0.00 0.00 0.00 99.95
2 1 0 0 52 1.14 6.49 0.00 0.00 92.21
1 2 0 0 52 0.00 0.08 0.00 0.00 99.86
0 0 0 0 71 0.00 0.00 0.00 0.00 99.89
0 0 0 0 25 0.00 0.00 0.00 0.00 99.96
0 0 0 0 74 0.00 0.00 0.00 0.00 99.94
0 1 0 0 24 0.00 0.00 0.00 0.00 99.84
ONE SHOT COMMAND 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. In this example, the "sleep
10" command is forked, and turbostat waits for it to complete before
saving all statistics into "ts.out". Note that "sleep 10" is not part
of turbostat, but is simply an example of a command that turbostat can
fork. The "ts.out" file is what you want to edit in a very wide win-
dow, paste into a spreadsheet, or attach to a bugzilla entry.
[root@hsw]# ./turbostat -o ts.out sleep 10
[root@hsw]#
PERIODIC INTERVAL EXAMPLE
Without a command to fork, turbostat displays statistics ever 5 sec-
onds. Periodic output goes to stdout, by default, unless --out is used
to specify an output file. The 5-second interval can be changed with
the "-i sec" option.
sudo turbostat --quiet --show CPU,frequency
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz CPU%c7 UncMhz
- - 524 12.48 4198 3096 74.53 3800
0 0 4 0.09 4081 3096 98.88 3800
0 4 1 0.02 4063 3096
1 1 2 0.06 4063 3096 99.60
1 5 2 0.05 4070 3096
2 2 4178 99.52 4199 3096 0.00
2 6 3 0.08 4159 3096
3 3 1 0.04 4046 3096 99.66
3 7 0 0.01 3989 3096
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz CPU%c7 UncMhz
- - 525 12.52 4198 3096 74.54 3800
0 0 4 0.10 4051 3096 99.49 3800
0 4 2 0.04 3993 3096
1 1 3 0.07 4054 3096 99.56
1 5 4 0.10 4018 3096
2 2 4178 99.51 4199 3096 0.00
2 6 4 0.09 4143 3096
3 3 2 0.06 4026 3096 99.10
3 7 7 0.17 4074 3096
This example also shows the use of the --show option to show only the
desired columns.
SYSTEM CONFIGURATION INFORMATION EXAMPLE
By default, turbostat always dumps system configuration information
before taking measurements. In the example above, "--quiet" is used to
suppress that output. Here is an example of the configuration informa-
tion:
turbostat version 2022.04.16 - Len Brown <lenb AT kernel.org>
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.18.0-rc6-00001-ge6891250e3b5 ...
CPUID(0): GenuineIntel 0x16 CPUID levels
CPUID(1): family:model:stepping 0x6:9e:9 (6:158:9) microcode 0xea
CPUID(0x80000000): max_extended_levels: 0x80000008
CPUID(1): SSE3 MONITOR - EIST TM2 TSC MSR ACPI-TM HT TM
CPUID(6): APERF, TURBO, DTS, PTM, HWP, HWPnotify, HWPwindow, HWPepp, No-HWPpkg, EPB
cpu7: MSR_IA32_MISC_ENABLE: 0x00850089 (TCC EIST MWAIT PREFETCH TURBO)
CPUID(7): SGX
cpu7: MSR_IA32_FEATURE_CONTROL: 0x00000005 (Locked )
CPUID(0x15): eax_crystal: 2 ebx_tsc: 258 ecx_crystal_hz: 0
TSC: 3096 MHz (24000000 Hz * 258 / 2 / 1000000)
CPUID(0x16): base_mhz: 3100 max_mhz: 4200 bus_mhz: 100
cpu7: MSR_MISC_PWR_MGMT: 0x00401cc0 (ENable-EIST_Coordination DISable-EPB DISable-OOB)
RAPL: 5825 sec. Joule Counter Range, at 45 Watts
cpu7: MSR_PLATFORM_INFO: 0x80839f1011f00
8 * 100.0 = 800.0 MHz max efficiency frequency
31 * 100.0 = 3100.0 MHz base frequency
cpu7: MSR_IA32_POWER_CTL: 0x002c005d (C1E auto-promotion: DISabled)
cpu7: MSR_TURBO_RATIO_LIMIT: 0x2728292a
39 * 100.0 = 3900.0 MHz max turbo 4 active cores
40 * 100.0 = 4000.0 MHz max turbo 3 active cores
41 * 100.0 = 4100.0 MHz max turbo 2 active cores
42 * 100.0 = 4200.0 MHz max turbo 1 active cores
cpu7: MSR_CONFIG_TDP_NOMINAL: 0x0000001f (base_ratio=31)
cpu7: MSR_CONFIG_TDP_LEVEL_1: 0x00000000 ()
cpu7: MSR_CONFIG_TDP_LEVEL_2: 0x00000000 ()
cpu7: MSR_CONFIG_TDP_CONTROL: 0x80000000 ( lock=1)
cpu7: MSR_TURBO_ACTIVATION_RATIO: 0x00000000 (MAX_NON_TURBO_RATIO=0 lock=0)
cpu7: MSR_PKG_CST_CONFIG_CONTROL: 0x1e008008 (UNdemote-C3, UNdemote-C1, demote-C3, demote-C1, locked, pkg-cstate-limit=8 (unlimited))
Uncore Frequency pkg0 die0: 800 - 3900 MHz (800 - 3900 MHz)
/dev/cpu_dma_latency: 2000000000 usec (default)
current_driver: intel_idle
current_governor: menu
current_governor_ro: menu
cpu7: POLL: CPUIDLE CORE POLL IDLE
cpu7: C1: MWAIT 0x00
cpu7: C1E: MWAIT 0x01
cpu7: C3: MWAIT 0x10
cpu7: C6: MWAIT 0x20
cpu7: C7s: MWAIT 0x33
cpu7: C8: MWAIT 0x40
cpu7: C9: MWAIT 0x50
cpu7: C10: MWAIT 0x60
cpu7: cpufreq driver: intel_pstate
cpu7: cpufreq governor: performance
cpufreq intel_pstate no_turbo: 0
cpu7: MSR_MISC_FEATURE_CONTROL: 0x00000000 (L2-Prefetch L2-Prefetch-pair L1-Prefetch L1-IP-Prefetch)
cpu0: MSR_PM_ENABLE: 0x00000001 (HWP)
cpu0: MSR_HWP_CAPABILITIES: 0x01101f53 (high 83 guar 31 eff 16 low 1)
cpu0: MSR_HWP_REQUEST: 0x00005353 (min 83 max 83 des 0 epp 0x0 window 0x0 pkg 0x0)
cpu0: MSR_HWP_INTERRUPT: 0x00000001 (EN_Guaranteed_Perf_Change, Dis_Excursion_Min)
cpu0: MSR_HWP_STATUS: 0x00000004 (No-Guaranteed_Perf_Change, No-Excursion_Min)
cpu0: EPB: 6 (balanced)
cpu0: MSR_RAPL_POWER_UNIT: 0x000a0e03 (0.125000 Watts, 0.000061 Joules, 0.000977 sec.)
cpu0: MSR_PKG_POWER_INFO: 0x00000168 (45 W TDP, RAPL 0 - 0 W, 0.000000 sec.)
cpu0: MSR_PKG_POWER_LIMIT: 0x42820800218208 (UNlocked)
cpu0: PKG Limit #1: ENabled (65.000 Watts, 64.000000 sec, clamp ENabled)
cpu0: PKG Limit #2: ENabled (65.000 Watts, 0.002441* sec, clamp DISabled)
cpu0: MSR_VR_CURRENT_CONFIG: 0x00000000
cpu0: PKG Limit #4: 0.000000 Watts (UNlocked)
cpu0: MSR_DRAM_POWER_LIMIT: 0x5400de00000000 (UNlocked)
cpu0: DRAM Limit: DISabled (0.000 Watts, 0.000977 sec, clamp DISabled)
cpu0: MSR_PP0_POLICY: 0
cpu0: MSR_PP0_POWER_LIMIT: 0x00000000 (UNlocked)
cpu0: Cores Limit: DISabled (0.000 Watts, 0.000977 sec, clamp DISabled)
cpu0: MSR_PP1_POLICY: 0
cpu0: MSR_PP1_POWER_LIMIT: 0x00000000 (UNlocked)
cpu0: GFX Limit: DISabled (0.000 Watts, 0.000977 sec, clamp DISabled)
cpu0: MSR_IA32_TEMPERATURE_TARGET: 0x00640000 (100 C) (100 default - 0 offset)
cpu0: MSR_IA32_PACKAGE_THERM_STATUS: 0x88200800 (68 C)
cpu0: MSR_IA32_PACKAGE_THERM_INTERRUPT: 0x00000003 (100 C, 100 C)
cpu7: MSR_PKGC3_IRTL: 0x0000884e (valid, 79872 ns)
cpu7: MSR_PKGC6_IRTL: 0x00008876 (valid, 120832 ns)
cpu7: MSR_PKGC7_IRTL: 0x00008894 (valid, 151552 ns)
cpu7: MSR_PKGC8_IRTL: 0x000088fa (valid, 256000 ns)
cpu7: MSR_PKGC9_IRTL: 0x0000894c (valid, 339968 ns)
cpu7: MSR_PKGC10_IRTL: 0x00008bf2 (valid, 1034240 ns)
The max efficiency frequency, a.k.a. Low Frequency Mode, is the fre-
quency 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.
ADD COUNTER EXAMPLE
Here we limit turbostat to showing just the CPU number for cpu0 - cpu3.
We add a counter showing the 32-bit raw value of MSR 0x199
(MSR_IA32_PERF_CTL), labeling it with the column header, "PRF_CTRL",
and display it only once, afte the conclusion of a 0.1 second sleep.
sudo ./turbostat --quiet --cpu 0-3 --show CPU --add msr0x199,u32,raw,PRF_CTRL sleep .1
0.101604 sec
CPU PRF_CTRL
- 0x00000000
0 0x00000c00
1 0x00000800
2 0x00000a00
3 0x00000800
INPUT
For interval-mode, turbostat will immediately end the current interval
when it sees a newline on standard input. turbostat will then start
the next interval. Control-C will be send a SIGINT to turbostat, which
will immediately abort the program with no further processing.
SIGNALS
SIGINT will interrupt interval-mode. The end-of-interval data will be
collected and displayed before turbostat exits.
SIGUSR1 will end current interval, end-of-interval data will be col-
lected and displayed before turbostat starts a new interval.
NOTES
turbostat must be run as root. Alternatively, non-root users can be
enabled to run turbostat this way:
# setcap cap_sys_admin,cap_sys_rawio,cap_sys_nice=+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 invoca-
tions 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 invari-
ant TSC, this value will be constant and will closely match the base
frequency value shown in the brand string in /proc/cpuinfo. On a sys-
tem where the TSC stops in idle, TSC_MHz will drop below the proces-
sor'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 reli-
able during intervals when TSC_MHz is not running at the base fre-
quency.
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" https://www.intel.com/prod-
ucts/processor/manuals/
FILES
/dev/cpu/*/msr
SEE ALSO
msr(4), vmstat(8)
AUTHOR
Written by Len Brown <len.brown AT intel.com>
TURBOSTAT(8)
Linux-Distributionen
Huschi als Linux-Admin