60

16

14

Apache

Simulator

12

10

8

Throughput

6

4

2

0

1

2

5

10

15

20

# of client

Fig. 4.4. Throughput Comparison between an Apache Server and the Simulator

Second, to test the timing parameters used for modeling an SSL enabled Web

server, we compare the throughputs of the simulator and a single Apache Web server,

which is configured to provide secure connections. We used the Clarknet trace as the

workload for the simulator and the Apache Web server. The LRU cache replacement

policy is employed in the simulator. Figure 4.4 plots the throughput as a function of the

number of clients. The throughput increases until the number of clients is 10, and after

that it enters the stable region. Figure 4.4 shows that the throughput of the simulation

and Apache server are very close. With the validated simulator, we next conduct a

detailed performance evaluation. All our simulation results are collected with 90 %

confidence interval.