have collected from March 2011 to April 2011. The CPU utilization is below 50% in terms of workload traces, and during the simulation the VM assignment had been random. Table 4 represents the characteristics of the workload. A CPU utilization had been collected from the servers that were located at more than 500 places around the world. Thousands of VMs were deployed in the workload as shown in Table 4 and measurements of CPU utilization was 5 minutes.

[L[2.2cm]{}|C[1.7cm]{}L[1.4cm]{}L[1.4cm]{}C[1.7cm]{}C[1.5cm]{}C[1.7cm]{}]{} **Date**&**Number of VMs**&**Mean**&**St. dev.**&**Quartile 1**&**Median**&**Quartile 3**\
03/03/2011 & 1052 & 12.31% & 17.09% & 2% & 6% & 15%\
06/03/2011 & 898 & 11.44% & 16.83% & 2% & 5% & 13%\
09/03/2011 & 1061 & 10.70% & 15.57% & 2% & 4% & 13%\
22/03/2011 & 1516 & 9.26% & 12.78% & 2% & 5% & 12%\
25/03/2011 & 1078 & 10.56% & 14.14% & 2% & 6% & 14%\
03/04/2011 & 1463 & 12.39% & 16.55% & 2% & 6% & 17%\
09/04/2011 & 1358 & 11.12% & 15.09% & 2% & 6% & 15%\
11/04/2011 & 1233 & 11.56% & 15.07% & 2% & 6% & 16%\
12/04/2011 & 1054 & 11.54% & 15.15% & 2% & 6% 