8.3.2 Procedure for requesting the maximum number of concurrent executions and pending queue

You can tune the maximum number of concurrent executions and pending queue size according to the following procedure:

1. Increase the multiplicity of requests by using tools such as the load generation tool.

   At this point, if the CPU usage on the server-side is 80% to 90% proceed to step 2. If the CPU usage is not 80% to 90%, the performance is low and it is not possible to increase the throughput, it is likely that there are bottlenecks in the I/O processing and exclusion processing. In such case, identify the process with the bottleneck and enhance the performance.

2. Set the multiplicity in which the CPU usage on the server-side has reached 80% to 90% as the maximum number of concurrent executions in the tuning parameters.

   The throughput at this stage is the maximum throughput of a single machine. Enhance the hardware if you require a higher throughput.

3. Check whether maximum throughput can be maintained by applying additional load by using tools such as load generation tool.

   If a maximum throughput cannot be maintained, revise the tuning parameter to prevent loads that exceed the maximum throughput.

4. Estimate the number of requests when the actual system is temporarily overloaded and when the loading is at a peak state and decide the size of the pending queue.

5. In an application having a hierarchical structure, revise the tuning parameter so that the size of the pending queue and number of concurrent executions in each layer can be balanced.

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