Disable AIO for WebSphere Application Server

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WebSphere® Application Server uses AIO by default. The purpose of these tests was to study the effect of disabling AIO for WebSphere Application Server.

Details are described in WebSphere Application Server setup.

wasb11e — Figure 1. ETR, ITR, and CPU utilization for the disable AIO for WebSphere Application Server test case

Observations

The setup using AIO on WebSphere has a 9% higher transaction throughput at nearly the same CPU utilization cost.

Conclusion

AIO on WebSphere has an advantage. Because WebSphere Application Server does nearly no disk I/O in our case, the advantage comes from asynchronous network I/O.