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Maximum Throughput Calculation
Based on the measurements from the test tool and from the monitoring tools, you can calculate the maximum throughput that the system (used in the test) will support. This is essential information that will be used in the capacity planning.
Throughput
Given the following situation:
Your system processed 23,000 queries in 1500 seconds. Your monitoring reveals the following utilization figures for your components.
|
Utilization |
||
|
Server |
% Processor |
% Disk |
|
Web |
60 |
0 |
|
Database 1 |
40 |
23 |
|
Database 2 |
30 |
20 |
|
Database 3 |
66 |
33 |
The maximum throughput is calculated as follows:
- Calculate your Average throughput. For instance if you measured 23,000 queries in 1500 seconds, so you have an Average Throughput of 23000/1500 = 15.3 Queries/Second.
Or in formula: 
- Then calculate you average service demand for all your measured components. For this you take the utilization of a component and divide that by your Average Throughput. The Web processor calculation gives therefore 0.6/15.3 = 0.03.
Or in formula: 
|
Average Service Demand |
||
|
Server |
Processor |
Disk |
|
Web |
0.0392 |
0 |
|
Database 1 |
0.0261 |
0.015 |
|
Database 2 |
0.0196 |
0.0131 |
|
Database 3 |
0.0431 |
0.0261 |
- The component with the highest service demand is the processor in database server 3. This is the weakest link in out chain and this link will determine the Maximum Throughput we can achieve. We can calculate the maximum throughput by 1/0,0431 = 23.2 Queries/second.
Or in formula: 