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\item default  \end{itemize}  These jobs have pre-determined processing times, which are distributed according to some general distribution $G$ (see figures). Three corresponding types of VMs can be started to process these jobs, where VM running costs are charged in hourly increments. This can be represented using a cost function $C(t)$ where $t$ is the running time of a server.  \[  \min\left(\left\{ 0,\left\lceil C(t) = \left\lceil  \frac{t}{3600}\right\rceil\right\} \right)  \]  The arrivals are most likely Markovian and obey a Poisson process. However, the workload depends on the time of day which makes the