Constant Arrival rate executor shows different result

[subhasis]

export let options = {
    scenarios: {
         my_api_test_constant_arr_rate_vu: {
           executor: 'constant-arrival-rate',
//           startVus: 0,
           rate: 1,
           duration: '1s',
           timeUnit: '1s',
           preAllocatedVUs: 1,
           maxVUs: 5000,
           tags: { test_type: 'get' },
//           exec: 'getQuotes',
        },
    },
    discardResponseBodies: true,
    thresholds: {
              http_req_duration: ['p(95)<60000', 'p(99)<60000'],
              http_req_failed: ['rate<0.01'], // http errors should be less than 1%
              checks: ['rate>0.99'],
        },
};

There is a map iterate of length 6 with 3 batch requests

Result shows:
Iterations -2 , Requests -36

How can it be 2 iterations ? How can I make only 1 iterations with 18 requests??

[eyeveebee]

Hi @subhasis

Without seeing the complete k6 output or fully understanding the scenario/s you describe, I believe the documentation can help you:

• Open and closed models explains the difference between constant-vus and 'constant-arrival-rate'.
  • Without seeing the test output, maybe the short duration is affecting the iterations you see. Have a look at the configuration for this executor: Constant arrival rate.
  • Arrival-rate VU allocation and Dropped iterations are also good reads that can help you interpret the outputs.
• Understanding the Different Types of Load Tests: Goals and Recommendations can help you understand the different tests you can run and choose the right executor/s for you.

If you can further describe what you are trying to achieve and share the k6 (sanitized) test code and ouptut/s, we can try to help. For example, you mention batch requests. However, with the information you provide, I’m not sure if batch can help.

I hope this helps

Cheers!