Gatling load tool to shift left

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
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<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
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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
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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
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14. Thank you