- Cumulative Moving Average (CMA): average of all data up to current
- Exponential Moving Average (EMA): weighted mean of the previous n
data and more weight is given to recent
- Simple Moving Average (SMA): unweighted mean of the previous n data
Currently bdevperf support only CMA to know average of IOPS. However
CMA may not be appropriate to know the trend of IOPS. EMA or SMA will
be better to take the role.
The formula of EMA utilized in bdevperf is the following
Multiplier = (2 / (Time periods + 1))
EMA: EMA[n+1] = (IOPS - EMA[n]} x multiplier + EMA[n].
One of the source of the formula is https://github.com/patharanordev/ema
Change-Id: Ia7a282f6d173ace470e05b19ee6dee5edf640617
Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-on: https://review.gerrithub.io/398886
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: GangCao <gang.cao@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
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