Question 1

How do I set up a basic load test with Ponos?

Accepted Answer

Clone the repository, compile with 'make', start an Erlang shell, define a task function and load spec (e.g., using ponos_load_specs:make_constant), then call ponos:add_load_generators and ponos:init_load_generators as shown in the quick start guide.

Question 2

Ponos vs Tsung: which is better for Erlang load testing?

Accepted Answer

Ponos is lighter and more flexible for custom load patterns within Erlang, ideal for simple, integrated tests. Tsung offers more features out-of-the-box like HTTP testing and distributed support, but with a steeper setup and learning curve.

Question 3

Can Ponos handle distributed load generation?

Accepted Answer

Not natively; distributed testing requires manual setup with multiple Ponos instances or integration with external tools, as Ponos focuses on single-node load generation without built-in distribution mechanisms.

Question 4

What are the limitations for high-intensity load in Ponos?

Accepted Answer

High loads can become CPU-bound on single cores, and Erlang timer delays limit precision above 500 Hz, so you may need multiple generators and accept reduced accuracy in intense scenarios.

Question 5

How to create custom load specifications in Ponos?

Accepted Answer

Implement a function that maps time in milliseconds to intensity in calls per second, following the fun(T) -> I pattern, and pass it as the load_spec argument when adding a load generator, as described in the Load Generators section.

Question 6

Does Ponos support real-time monitoring of tests?

Accepted Answer

No built-in support; monitoring requires custom task runner implementation or external tools, since Ponos primarily generates load without integrated monitoring features, relying on logging via ponos_file_task_runner or similar.

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