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Load Testing of covid-ht Instances

covid-ht includes scripts to estimate the instance capacity and to simulate usage scenarios in order to fulfill demand.

Those scripts are meant to be run with locust and located in the ´´locustfiles/´´ directory.

Installation

  • Install the load testing requirements:
> (activate your virtualenv)
> pip install -r requirements_load_testing.txt

Configuration

If the Example Data is not available, you will have to provide a user and its credentials by setting the counterintuitively named environment variables CHTLT_USER_USERNAME, CHTLT_USER_PASSWORD and CHTLT_USER_AUTH_TOKEN.

Estimating Instance Capacity

  • Make sure that your instance is running (i.e. already deployed or with

´´./manage.py runserver´´)

  • From the base dir of the distribution, run:
> locust -f locustfiles/<load_testing_file>.py

Four tests are provided:

  • ´´api_classify´´ for testing classification via the REST API,
  • ´´api_data_input´´ for testing data input via the REST API,
  • ´´classify´´ for testing classification via the HTML front-end,
  • ´´data_input´´ for testing data input via the HTML front-end.

Each test will stress-test the instance in its particular way, giving an estimate of the instance capacity to fulfill demand.

Details of the tests are found in their respective files.

Simulating Usage Scenarions

Two different processes are provided for simulating usage scenarios: ´´doctors´´ and ´´inputers´´.

  • ´´doctors´´ simulate doctors attending patients,
  • ´´inputters´´ simulate data inputters inputting hemogram results.

Details of the processes are found in their respective files.

For running the scenario - with your instance running - from a shell run:

> locust -f locustfiles/doctors.py

and from another shell:

> locust -f locustfiles/inputters.py --web-port 8090

(The processes are meant to be run simultaneously)

Notes

  • Classification performance depends on the Current Classifier

selected for the instance. * Data input test will generate actual data in your instance. * locust Documentation.