Katie Koschland - Ready, steady, crash - Codemotion Amsterdam 2019

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The key to finding the optimal solution to a problem is to threefold: maximise the number of tools in your ‘personal tool box’; know all their capabilities and uses; and to know which tool is best suited to fix the particular problem in front of you. This talk will enable you to grow all three aspects around load testing. It will look at what it means to ‘load test’ your application, how to get started with writing your first script and provide you with a case study and an insight as to the tools and techniques that we use here at the FT to help identify such performance issues.

Ready, Steady, Crash!
Katie Koschland
Engineer, Financial Times
@KKoschland

Could my users be having a
similar experience? ¯_(ツ)_/¯
@KKoschland

I am going to talk about my
load testing journey.
@KKoschland

I will aim to cover the core
concepts behind load
testing.
@KKoschland

1. The Challenge
2. Getting started
3. Identify performance issue
4. Troubleshooting
5. Outcomes
@KKoschland

Testing the technical limits
of our node application.
@KKoschland

If so, can our application
recover?
@KKoschland

What happens to the user
experience?
@KKoschland

I was told the answers
could be found by load
testing.
@KKoschland

So, what exactly is
load testing ?
@KKoschland

@KKoschland
“It is about simulating
ordinary user activity
and then applying
stress until it reaches
failure.”
@Jadware

How can I apply this so
called ‘stress’ to my
application?
@KKoschland

There are many frameworks
out there.
@KKoschland

I decided to go with Artillery.
@KKoschland

Allows you to customise JS
code within your scripts.
@KKoschland

Scripts could be configured
using YAML.
@KKoschland

Targeted towards
continuous integration.
@KKoschland

Decide on the type
of requests.
@KKoschland

Scripts need to be able to
represent ordinary user
activity.
@KKoschland

Decide on the shape
of load.
@KKoschland

You may already know the
shape of load.
@KKoschland

Before the
release of a push
notification.
@KKoschland

But it’s also okay if you don’t
know...
@KKoschland

You can split the script into
four separate phases.
@KKoschland

Warm Up
Arrival rate of 10 virtual
users/second for 60
seconds.
@KKoschland

Ramp up
Arrival rate of 10 to 25 new
virtual users/second for 120
seconds.
@KKoschland

Cruise
Arrival rate of 25 virtual
users/second for 1200
seconds.
@KKoschland

Crash
Arrival rate of 100 virtual
users/second for 30
seconds.
@KKoschland

@KKoschland
Shape of load hitting FT.com
homepage
warm up ramp up Cruise
Crash

What should the
first script look like?
@KKoschland

The script is split into two
sections.
@KKoschland

Artillery will provide you with a
summary report which
contains detailed metrics.
@KKoschland

We had
identified a
serious
performance
issue.
@KKoschland

Increased the pool size,
decreased the retry timeout.
@KKoschland

Parameterized the cypher query
@KKoschland

Configuration
issue with db?
@KKoschland

So, why have I shared this
example with you?
@KKoschland

Able to measure, assess
and improve the overall
performance of our
application.
@KKoschland

Able to assess the
reliability of our application.
@KKoschland

To fully understand the
performance and reliability
of what you’re building, you
should all be load testing
your application.
@KKoschland

We’re hiring!
Visit ft.com/dev/null
@KKoschland

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