tree 85f44eb1fd6809155332d5b1cb560bad2320f82a
parent 12dc5eeafc126ec5a6c9e4efba06a171342263e9
author Roman Lebedev <lebedev.ri@gmail.com> 1630691050 +0300
committer GitHub <noreply@github.com> 1630691050 +0100
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Introduce Coefficient of variation aggregate (#1220)

* Introduce Coefficient of variation aggregate

I believe, it is much more useful / use to understand,
because it is already normalized by the mean,
so it is not affected by the duration of the benchmark,
unlike the standard deviation.

Example of real-world output:
```
raw.pixls.us-unique/GoPro/HERO6 Black$ ~/rawspeed/build-old/src/utilities/rsbench/rsbench GOPR9172.GPR --benchmark_repetitions=27 --benchmark_display_aggregates_only=true --benchmark_counters_tabular=true
2021-09-03T18:05:56+03:00
Running /home/lebedevri/rawspeed/build-old/src/utilities/rsbench/rsbench
Run on (32 X 3596.16 MHz CPU s)
CPU Caches:
  L1 Data 32 KiB (x16)
  L1 Instruction 32 KiB (x16)
  L2 Unified 512 KiB (x16)
  L3 Unified 32768 KiB (x2)
Load Average: 7.00, 2.99, 1.85
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Benchmark                                                      Time             CPU   Iterations  CPUTime,s CPUTime/WallTime     Pixels Pixels/CPUTime Pixels/WallTime Raws/CPUTime Raws/WallTime WallTime,s
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
GOPR9172.GPR/threads:32/process_time/real_time_mean         11.1 ms          353 ms           27   0.353122          31.9473        12M       33.9879M        1085.84M      2.83232       90.4864  0.0110535
GOPR9172.GPR/threads:32/process_time/real_time_median       11.0 ms          352 ms           27   0.351696          31.9599        12M       34.1203M        1090.11M      2.84336       90.8425  0.0110081
GOPR9172.GPR/threads:32/process_time/real_time_stddev      0.159 ms         4.60 ms           27   4.59539m        0.0462064          0       426.371k        14.9631M    0.0355309       1.24692   158.944u
GOPR9172.GPR/threads:32/process_time/real_time_cv           1.44 %          1.30 %            27  0.0130136         1.44633m          0      0.0125448       0.0137802    0.0125448     0.0137802  0.0143795
```

Fixes https://github.com/google/benchmark/issues/1146

* Be consistent, it's CV, not 'rel std dev'