Table 1 Parameter description

w ( t )

Workload at time t

rR ( t )

Reader VM CPU resource need at time t

rL ( t )

Loader VM CPU resource need at time t

${\mathit{w}}_{\mathit{h}}^{\mathit{Des}}$

Horizontal double exponential smoothing prediction

${\mathit{w}}_{\mathit{d}}^{\mathit{Des}}$

Vertical double exponential smoothing prediction

w′

Two-level double exponential smoothing