To verify our argument that ssl with bf may yield better load balance and higher
utilization of the CPU at each node, we measured the average CPU utilization and
its standard deviation for the ssl with session and ssl with bf models. ssl with session
values in Table 4.3 are normalized with respect to the ssl with bf values. As expected,
ssl with bf shows better utilization than the ssl with session model. In the 16 node server,
the utilization of the ssl with session model is 80% of the utilization of ssl with bf. The
utilization gap of the two models slightly increases for the 32 node server, because in a
larger cluster, load imbalance among the nodes is likely to be high. This is also noticed
from the standard deviation of the CPU utilization. The standard deviation of the CPU
utilization of two models indicates that ssl with bf offers better load balance among the
nodes compared to ssl with session.
CPU Time Break Down
Symmetric & hash
Fig. 4.7. Normalized Breakdown of the CPU Time in a Server, The Bars Represent the
Values for the ssl with bf, ssl with session and RR from Left to Right.