Load Testing

Kalil de lima

kalil@rootstrap.com - github.com/kaozdl

What can we do with this tool?

- Simulates how an application performs on a regular day

- Get insights about the general user experience

- Identify areas that need improvements

Oh, Like a stress test!

NO

- The goal is simulating user experience

- Is not trying to break the app

- Tested with normal workload

 Load Test vs Stress Test

- The goal is finding the breakpoint

- Does not handle daily scenarios

- Not tested with normal workload

How Antel lines will perform at Christmas Midnight?

Examples:

How can we perform such tests?

First we need a reality model

- How many users do we have?

- Are we dealing with rush/peak hours?

- How do users use the app?

We need information like:

Some considerations

- Several user bases are useful.

- User ramp-up is distributed across time.

- App will not be tested extensively.

- Runs against production-like infrastructure.

- Focus on performance and degradation, not bugs.

- Does not replace unit and integration tests.

Tools

- Postman on steroids

- Open Source

- Pre-define user flows

- Run user flows concurrently

- Distribute flows on timespan

What is Jmeter

New Relic

- Server monitoring tool

- Available on Heroku as addon

- Tracks errors and slow queries

- Integrates with Rails, Django, Node, PHP and Java among others

Our case study:
LOIL

JMeter Graphs, What can we read here?

Taking a closer look

Evaluating how the app scales

Result Tables

Error Rates

Conclusion

 - Allows to simulate our user experience 

- Identify bottlenecks

- Optimize smartly

- Gives insights to plan scaling

Our Toolbox

- Jmeter

- New Relic

- Logs