This document provides an overview of using Gatling, an open-source load testing tool, for performance and load testing. It discusses why to use Gatling, how to use Gatling including writing tests in Scala and executing them with Maven, and key features like logging, feeders, checks, and assumptions. It also briefly mentions using Gatling with Frontline for pipeline testing.

1. Revised: February 24, 2018
Gatling for Load and
Performance Testing
Kevin McGoldrick

2. GATLING TO SHIFT LEFT
Why use Gatling?
Develop QA Perf Stage Production
2
Develop QA Perf Stage Production

3. 3
GATLING FOR DEVELOPERS
How to use Gatling?
• Compare to Jmeter, Locust, The Grinder, Intuit Tank, etc.
• Scala is a general-purpose programming language providing
support for functional programming and a strong static type
system. Designed to be concise, many of Scala's design
decisions aimed to address criticisms of Java.
• Gatling Cheat Sheet

4. val httpConf = http
.acceptHeader("text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
.doNotTrackHeader("1")
.acceptLanguageHeader("en-US,en;q=0.5")
.acceptEncodingHeader("gzip, deflate")
.userAgentHeader("Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:16.0) Gecko/20100101
Firefox/16.0")
val google = scenario("Search for Game of Thrones on Google")
.exec(http("https://google.com/search?q=game+of+thrones")
.get("https://google.com/search?q=game+of+thrones"))
val yahoo = scenario("Search for Game of Thrones on Yahoo")
.exec(http("https://search.yahoo.com/search?p=game+of+thrones")
.get("https://search.yahoo.com/search?p=game+of+thrones"))
setUp(
google.inject(constantUsersPerSec(2) during(2 minutes)),
yahoo.inject(constantUsersPerSec(2) during(2 minutes))
).protocols(httpConf)

5. GATLING WITH MAVEN
Executing the test
5
<plugin>
<groupId>io.gatling</groupId>
<artifactId>gatling-maven-plugin</artifactId>
<version>3.0.0-M2</version>
<executions>
<execution>
<goals>
<goal>execute</goal>
</goals>
</execution>
</executions>
</plugin>
mvn gatling:execute -Dgatling.simulationClass=<simulationName> -Denv=perf -Dpercent=10 -Dramp=15 -
Dduration=60

6. GATLING LOGGING, CHARTING
Fast Debugging for faster turnaround
6

7. GATLING LOGGING, CHARTING
Fast Debugging for faster turnaround
7
>>>>>>>>>>>>>>>>>>>>>>>>>>
Request:https://google.com/search?q=game+of+thrones: KO status.find.in(200,304,201,202,203,204,205,206,207,208,209),
but actually found 404
=========================
HTTP request:
GET https://google.com/searchz?q=game+of+thrones
headers=Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8DNT: 1Accept-Language: en-
US,en;q=0.5Accept-Encoding: gzip, deflateUser-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:16.0)
Gecko/20100101 Firefox/16.0
host: google.com
=========================
HTTP response:
status=404 Not Found
headers= Content-Type: text/html; charset=UTF-8Referrer-Policy: no-referrerContent-Length: 1568Date: Thu, 22 Feb
2018 02:23:09 GMTAlt-Svc: hq=":443"; ma=2592000; quic=51303431; quic=51303339; quic=51303338; quic=51303337;
quic=51303335,quic=":443"; ma=2592000; v="41,39,38,37,35"
Body=….a bunch of HTML returned with the 404 that I’ve hidden to fit on the slide…
<<<<<<<<<<<<<<<<<<<<<<<<<

8. • Header for requesting compressed content
• http.acceptEncodingHeader("gzip, deflate") or
• .header(HttpHeaderNames.ContentEncoding,"gzip, deflate")
• Compress upload payload
• .processRequestBody(gzipBody)
• .header(HttpHeaderNames.ContentEncoding, "gzip")
GATLING COMPRESSION HEADERS
Don’t forget to act like a browser
8

9. 9
GATLING FEEDERS
Everything is a new thread
• RecordSeqFeederBuilder
• CSV feeders
• JSON feeders
• JDBC feeder
• Sitemap Feeder
• Redis feeder
Documentation

10. GATLING CHECKS
Validate call responses
val scn = scenario(“test”)
.exec(http(…)
.check(
status.is(200),
jsonPath("$.iamTicket.ticket").saveAs("ticket"),
jsonPath("$.iamTicket.userId").saveAs("authid")
)
)
Documentation

11. GATLING ASSUMPTIONS
Validation done in code
11
setUp(
…
).assertions(
forAll.responseTime.percentile1.lte(600), //50th pecentile
forAll.responseTime.percentile3.lte(800), //95th pecentile
forAll.responseTime.percentile4.lte(5000), //99th pecentile
global.successfulRequests.percent.gt(99)
)
Documentation

12. CONCURRENTHASHMAP
To share data between threads
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• Data specific to a user, or situation can be stored in a way
the async threads can access without error.
• Source

13. • API for Pipelining automated testing
• Live charting of performance data (Cassandra)
• Driver machines utilized from cloud providers
• Split load across driver machines
• frontline
GATLING WITH FRONTLINE
Pipeline testing
13

14. Thank you