Java Reference
In-Depth Information
The factors that affect the scalability of the server and long
term strategy and tabulated below.
Figure 23: Growth Projections
Capacity planning starts with measurement, in this case
response time versus load. Once you know the degree to
which the programs slows down with load, which is NOT a
linear function, you can select a response time target, and then
discover what resources it will take to meet that target for a
given amount of load.
Performance measurement is always done with time units, as
they are what users care about and they can be scaled up and
down. Things like %CPU and IOPS are system-specific, so
you only use them when you have planned the system and
measured it in pre-production, to act as a "surrogate" for the
thing you care about, time.
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