Testing threads

A load generator creates parallel testing threads. Operations within threads are performed sequentially, that is, after a request is created, a response is awaited. The thread where a response is awaited is unavailable for new requests. To ensure the required load, a generator uses the following threads.

You can track thread utilization on a chart in the report.

The maximum number of requests per second depends on the number of testing threads and the total request response time in a given second:

RPS_max = number of testing threads / (total request response time in a given second)

Where RPS_max is the maximum number of requests per second.

By default, Phantom creates 1000 testing threads.

Pandora creates 1000 testing threads unless you filled in the Testing threads field when configuring via the form. However, if the configuration file was used and the number of testing threads was not specified, Pandora will terminate with an error.

If you need to set the number of threads, configure it in the management console.

You can calculate the required number of testing threads using this formula:

Number of testing threads = RPS x (average response time in seconds)

Where RPS is the number of requests per second.

For example, to ensure a load of 200 requests per second at an average response time of 50 ms, you need to create 10 testing threads.

Sample configuration fileSample configuration file

An example of configuring testing threads to generate 200 requests per second over 5 minutes:

pandora:
  enabled: true
  package: yandextank.plugins.Pandora
  config_content:
    pools:
      - id: HTTP
        gun:
          type: http
          target: localhost:80
        ammo:
          file: /tmp/ammofile
          type: uri
        result:
          type: phout
          destination: ./phout.log
        startup:
          type: once
          times: 10         # Number of threads
        rps:
          - duration: 300s # Test duration
            type: step # Load type
            ops: 200        # Number of requests per second
    log:
      level: error
    monitoring:
      expvar:
        enabled: true
        port: 1234

phantom:
  enabled: true
  package: yandextank.plugins.Phantom
  address: localhost:80
  ammo_type: uri
  instances: 10             # Number of threads
  load_profile:
    load_type: rps
    schedule: const(200,5m) # Load schedule: 200 requests per second over 5 minutes
  uris: ['/']