next up previous
Next: Weighted capacity selection Up: Architectures emulated on test Previous: Round robin selection

Random selection

Figure 5.2: Average response time with Random selection policy used at DNS
\includegraphics{responsera.eps}

As the name indicates, random policy selects any cluster randomly for each query thus this policy should also resolve IP address of each cluster equal number of time in the long duration. But as opposed to round robin, for very small duration IP address of one cluster may be resolved many times more than that of others. This is the policy (however coupled with shuffling of IP addresses) implemented in BIND.

Average response times reported by webstone is plotted in Figure 5.2. Since selection of server was random, average response time measures also seems to have no fixed pattern.



Puneet Agarwal 2001-05-12