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# turbostat -d 0x34 is useful for printing the number of SMI's within an interval on Nehalem and newer processors. where # turbostat -m 0x34 will simply print out the total SMI count since reset. Suggested-by: Andi Kleen Signed-off-by: Len Brown <len.brown@intel.com>
224 lines
8.2 KiB
Groff
224 lines
8.2 KiB
Groff
.TH TURBOSTAT 8
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.SH NAME
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turbostat \- Report processor frequency and idle statistics
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.SH SYNOPSIS
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.ft B
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.B turbostat
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.RB [ Options ]
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.RB command
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.br
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.B turbostat
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.RB [ Options ]
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.RB [ "\-i interval_sec" ]
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.SH DESCRIPTION
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\fBturbostat \fP reports processor topology, frequency
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and idle power state statistics on modern X86 processors.
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Either \fBcommand\fP is forked and statistics are printed
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upon its completion, or statistics are printed periodically.
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\fBturbostat \fP
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requires that the processor
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supports an "invariant" TSC, plus the APERF and MPERF MSRs.
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\fBturbostat \fP will report idle cpu power state residency
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on processors that additionally support C-state residency counters.
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.SS Options
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The \fB-s\fP option limits output to a 1-line system summary for each interval.
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.PP
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The \fB-c\fP option limits output to the 1st thread in each core.
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.PP
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The \fB-p\fP option limits output to the 1st thread in each package.
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.PP
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The \fB-v\fP option increases verbosity.
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.PP
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The \fB-d MSR#\fP option includes the delta of the specified 32-bit MSR counter.
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.PP
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The \fB-D MSR#\fP option includes the delta of the specified 64-bit MSR counter.
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.PP
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The \fB-m MSR#\fP option includes the the specified 32-bit MSR value.
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.PP
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The \fB-M MSR#\fP option includes the the specified 64-bit MSR value.
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.PP
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The \fB-i interval_sec\fP option prints statistics every \fiinterval_sec\fP seconds.
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The default is 5 seconds.
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.PP
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The \fBcommand\fP parameter forks \fBcommand\fP and upon its exit,
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displays the statistics gathered since it was forked.
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.PP
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.SH FIELD DESCRIPTIONS
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.nf
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\fBpk\fP processor package number.
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\fBcor\fP processor core number.
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\fBCPU\fP Linux CPU (logical processor) number.
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Note that multiple CPUs per core indicate support for Intel(R) Hyper-Threading Technology.
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\fB%c0\fP percent of the interval that the CPU retired instructions.
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\fBGHz\fP average clock rate while the CPU was in c0 state.
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\fBTSC\fP average GHz that the TSC ran during the entire interval.
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\fB%c1, %c3, %c6, %c7\fP show the percentage residency in hardware core idle states.
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\fB%pc2, %pc3, %pc6, %pc7\fP percentage residency in hardware package idle states.
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.fi
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.PP
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.SH EXAMPLE
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Without any parameters, turbostat prints out counters ever 5 seconds.
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(override interval with "-i sec" option, or specify a command
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for turbostat to fork).
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The first row of statistics is a summary for the entire system.
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Note that the summary is a weighted average.
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Subsequent rows show per-CPU statistics.
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.nf
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[root@x980]# ./turbostat
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cor CPU %c0 GHz TSC %c1 %c3 %c6 %pc3 %pc6
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0.09 1.62 3.38 1.83 0.32 97.76 1.26 83.61
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0 0 0.15 1.62 3.38 10.23 0.05 89.56 1.26 83.61
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0 6 0.05 1.62 3.38 10.34
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1 2 0.03 1.62 3.38 0.07 0.05 99.86
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1 8 0.03 1.62 3.38 0.06
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2 4 0.21 1.62 3.38 0.10 1.49 98.21
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2 10 0.02 1.62 3.38 0.29
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8 1 0.04 1.62 3.38 0.04 0.08 99.84
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8 7 0.01 1.62 3.38 0.06
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9 3 0.53 1.62 3.38 0.10 0.20 99.17
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9 9 0.02 1.62 3.38 0.60
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10 5 0.01 1.62 3.38 0.02 0.04 99.92
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10 11 0.02 1.62 3.38 0.02
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.fi
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.SH SUMMARY EXAMPLE
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The "-s" option prints the column headers just once,
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and then the one line system summary for each sample interval.
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.nf
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[root@x980]# ./turbostat -s
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%c0 GHz TSC %c1 %c3 %c6 %pc3 %pc6
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0.23 1.67 3.38 2.00 0.30 97.47 1.07 82.12
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0.10 1.62 3.38 1.87 2.25 95.77 12.02 72.60
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0.20 1.64 3.38 1.98 0.11 97.72 0.30 83.36
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0.11 1.70 3.38 1.86 1.81 96.22 9.71 74.90
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.fi
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.SH VERBOSE EXAMPLE
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The "-v" option adds verbosity to the output:
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.nf
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GenuineIntel 11 CPUID levels; family:model:stepping 0x6:2c:2 (6:44:2)
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12 * 133 = 1600 MHz max efficiency
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25 * 133 = 3333 MHz TSC frequency
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26 * 133 = 3467 MHz max turbo 4 active cores
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26 * 133 = 3467 MHz max turbo 3 active cores
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27 * 133 = 3600 MHz max turbo 2 active cores
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27 * 133 = 3600 MHz max turbo 1 active cores
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.fi
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The \fBmax efficiency\fP frequency, a.k.a. Low Frequency Mode, is the frequency
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available at the minimum package voltage. The \fBTSC frequency\fP is the nominal
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maximum frequency of the processor if turbo-mode were not available. This frequency
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should be sustainable on all CPUs indefinitely, given nominal power and cooling.
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The remaining rows show what maximum turbo frequency is possible
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depending on the number of idle cores. Note that this information is
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not available on all processors.
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.SH FORK EXAMPLE
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If turbostat is invoked with a command, it will fork that command
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and output the statistics gathered when the command exits.
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eg. Here a cycle soaker is run on 1 CPU (see %c0) for a few seconds
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until ^C while the other CPUs are mostly idle:
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.nf
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[root@x980 lenb]# ./turbostat cat /dev/zero > /dev/null
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^C
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cor CPU %c0 GHz TSC %c1 %c3 %c6 %pc3 %pc6
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8.86 3.61 3.38 15.06 31.19 44.89 0.00 0.00
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0 0 1.46 3.22 3.38 16.84 29.48 52.22 0.00 0.00
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0 6 0.21 3.06 3.38 18.09
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1 2 0.53 3.33 3.38 2.80 46.40 50.27
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1 8 0.89 3.47 3.38 2.44
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2 4 1.36 3.43 3.38 9.04 23.71 65.89
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2 10 0.18 2.86 3.38 10.22
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8 1 0.04 2.87 3.38 99.96 0.01 0.00
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8 7 99.72 3.63 3.38 0.27
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9 3 0.31 3.21 3.38 7.64 56.55 35.50
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9 9 0.08 2.95 3.38 7.88
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10 5 1.42 3.43 3.38 2.14 30.99 65.44
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10 11 0.16 2.88 3.38 3.40
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.fi
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Above the cycle soaker drives cpu7 up its 3.6 Ghz turbo limit
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while the other processors are generally in various states of idle.
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Note that cpu1 and cpu7 are HT siblings within core8.
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As cpu7 is very busy, it prevents its sibling, cpu1,
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from entering a c-state deeper than c1.
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Note that turbostat reports average GHz of 3.63, while
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the arithmetic average of the GHz column above is lower.
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This is a weighted average, where the weight is %c0. ie. it is the total number of
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un-halted cycles elapsed per time divided by the number of CPUs.
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.SH SMI COUNTING EXAMPLE
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On Intel Nehalem and newer processors, MSR 0x34 is a System Management Mode Interrupt (SMI) counter.
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Using the -m option, you can display how many SMIs have fired since reset, or if there
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are SMIs during the measurement interval, you can display the delta using the -d option.
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.nf
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[root@x980 ~]# turbostat -m 0x34
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cor CPU %c0 GHz TSC MSR 0x034 %c1 %c3 %c6 %pc3 %pc6
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1.41 1.82 3.38 0x00000000 8.92 37.82 51.85 17.37 0.55
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0 0 3.73 2.03 3.38 0x00000055 1.72 48.25 46.31 17.38 0.55
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0 6 0.14 1.63 3.38 0x00000056 5.30
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1 2 2.51 1.80 3.38 0x00000056 15.65 29.33 52.52
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1 8 0.10 1.65 3.38 0x00000056 18.05
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2 4 1.16 1.68 3.38 0x00000056 5.87 24.47 68.50
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2 10 0.10 1.63 3.38 0x00000056 6.93
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8 1 3.84 1.91 3.38 0x00000056 1.36 50.65 44.16
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8 7 0.08 1.64 3.38 0x00000056 5.12
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9 3 1.82 1.73 3.38 0x00000056 7.59 24.21 66.38
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9 9 0.09 1.68 3.38 0x00000056 9.32
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10 5 1.66 1.65 3.38 0x00000056 15.10 50.00 33.23
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10 11 1.72 1.65 3.38 0x00000056 15.05
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^C
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[root@x980 ~]#
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.fi
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.SH NOTES
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.B "turbostat "
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must be run as root.
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.B "turbostat "
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reads hardware counters, but doesn't write them.
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So it will not interfere with the OS or other programs, including
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multiple invocations of itself.
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\fBturbostat \fP
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may work poorly on Linux-2.6.20 through 2.6.29,
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as \fBacpi-cpufreq \fPperiodically cleared the APERF and MPERF
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in those kernels.
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If the TSC column does not make sense, then
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the other numbers will also make no sense.
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Turbostat is lightweight, and its data collection is not atomic.
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These issues are usually caused by an extremely short measurement
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interval (much less than 1 second), or system activity that prevents
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turbostat from being able to run on all CPUS to quickly collect data.
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The APERF, MPERF MSRs are defined to count non-halted cycles.
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Although it is not guaranteed by the architecture, turbostat assumes
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that they count at TSC rate, which is true on all processors tested to date.
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.SH REFERENCES
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"Intel® Turbo Boost Technology
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in Intel® Core™ Microarchitecture (Nehalem) Based Processors"
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http://download.intel.com/design/processor/applnots/320354.pdf
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"Intel® 64 and IA-32 Architectures Software Developer's Manual
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Volume 3B: System Programming Guide"
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http://www.intel.com/products/processor/manuals/
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.SH FILES
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.ta
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.nf
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/dev/cpu/*/msr
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.fi
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.SH "SEE ALSO"
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msr(4), vmstat(8)
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.PP
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.SH AUTHOR
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.nf
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Written by Len Brown <len.brown@intel.com>
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