8.3. Load Testing Pitfalls

Several tricky issues arise in setting up a test environment for an email system. Some of these issues may seem obvious, but others probably won’t be. In any case, it’s always best to be aware of these potential problems before getting started so the necessary choices are made explicitly.

Suppose we have an email test environment in which we have set up a single target machine with a dedicated disk for the queue and a reasonable RAID system for the message store. Further suppose that we plan to test how many messages per second the system can receive and store. Besides its overall capacity in ab-sorbing email messages, we’d like to know the location of the next bottleneck so that we can evaluate whether we might need ...

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