InjectPerSec Behavior is not consistent

[kweinberg1]

We have a load test where we want to reach a specific amount of calls over an hour. The call rate is expected to be consistent over that duration of the test, so we're using InjectPerSec. However, have received inconsistent results at values greater than 10.

The first thing I've verified that the code executed in the scenario is not the problem. I am able to reproduce the issue with an empty step in the scenario:

                IStep injectPerSecStep = Step.Create(
                "InjectPerSec Step",
                context =>
                {
                    return Task.FromResult(Response.Ok(statusCode: 200));
                },
                timeOut);

With InjectPerSec set to 11 and 10 agents running concurrently, I would expect a two minute run to accumulate approximately 13,200 calls. NBomber will register significantly fewer calls than expected. The best case was about 4,500 tests. I expect NBomber to come at least close to hitting that target.

I'm currently using NBomber 3.0.1.