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Load Testing with
Gatling
Chris Birchall
2013/12/6
#m3dev Tech Talk
Existing (free) load test tools
● Siege
○ Simple, classic (first released in 2000?)
○ Limited scripting support

● JMeter
○ Scripting via UI, or lots of XML
Gatling
● Powerful scripting using Scala DSL
● Record scenarios from browser, à la
Selenium
● Run multiple scenarios in one simulation
● Graphical reports with pretty graphs
Getting started
1. Download (gatling-tool.org) and unzip
2. Create a simulation
a. write from scratch using DSL, or
b. record using Recorder

3. Run bin/gatling.sh
a. Interactive CLI - choose simulation to run

4. View HTML report (sample)
Scripting DSL
val scn = scenario("Scenario name")
.exec(
http("request_1")
.get("/")
.headers(headers_1)
.check(status.is(302)))
.pause(0 milliseconds, 100 milliseconds)
.exec(...
DSL - Advanced features (1)
Loading data from CSV file
scenario(“login”)
.feed(csv("user_credentials.csv"))
.exec(
http("request_3")
.post("/login")
.param("username", "${username}")
.param("password", "${password}")
...

username,password
user1,password1
user2,password2
user3,password3
user4,password4
user5,password5
user6,password6
user7,password7
user8,password8
user9,password9
user10,password10

Can also load from JDBC/Redis/custom file format/...
DSL - Advanced features (2)
Reading data from page, re-using it later
http("find_account_id")
.get("/accounts.html")
.check(regex("""<td class="number">ACC(d+)</td>""")
.saveAs("account_id")))
.pause(7, 8)
.exec(
http("account_details_page")
.get("/account/ACC${account_id}/operations.html")
...
Recording scenarios
1. bin/recorder.sh
a. starts a Swing GUI

2. Customise scenario config
a. set filters to limit which requests are recorded

3. Click “Start!” button
a. starts an HTTP proxy on localhost:8000

4. Browse any site via the proxy
5. Click “Stop and save”
a. Generates a DSL script
Internals
●
●
●
●
●

Implemented in Scala
AsyncHttpClient, Netty
Akka
Architecture details
Example actor

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Load testing with gatling

  • 1. Load Testing with Gatling Chris Birchall 2013/12/6 #m3dev Tech Talk
  • 2. Existing (free) load test tools ● Siege ○ Simple, classic (first released in 2000?) ○ Limited scripting support ● JMeter ○ Scripting via UI, or lots of XML
  • 3. Gatling ● Powerful scripting using Scala DSL ● Record scenarios from browser, à la Selenium ● Run multiple scenarios in one simulation ● Graphical reports with pretty graphs
  • 4. Getting started 1. Download (gatling-tool.org) and unzip 2. Create a simulation a. write from scratch using DSL, or b. record using Recorder 3. Run bin/gatling.sh a. Interactive CLI - choose simulation to run 4. View HTML report (sample)
  • 5. Scripting DSL val scn = scenario("Scenario name") .exec( http("request_1") .get("/") .headers(headers_1) .check(status.is(302))) .pause(0 milliseconds, 100 milliseconds) .exec(...
  • 6. DSL - Advanced features (1) Loading data from CSV file scenario(“login”) .feed(csv("user_credentials.csv")) .exec( http("request_3") .post("/login") .param("username", "${username}") .param("password", "${password}") ... username,password user1,password1 user2,password2 user3,password3 user4,password4 user5,password5 user6,password6 user7,password7 user8,password8 user9,password9 user10,password10 Can also load from JDBC/Redis/custom file format/...
  • 7. DSL - Advanced features (2) Reading data from page, re-using it later http("find_account_id") .get("/accounts.html") .check(regex("""<td class="number">ACC(d+)</td>""") .saveAs("account_id"))) .pause(7, 8) .exec( http("account_details_page") .get("/account/ACC${account_id}/operations.html") ...
  • 8. Recording scenarios 1. bin/recorder.sh a. starts a Swing GUI 2. Customise scenario config a. set filters to limit which requests are recorded 3. Click “Start!” button a. starts an HTTP proxy on localhost:8000 4. Browse any site via the proxy 5. Click “Stop and save” a. Generates a DSL script
  • 9. Internals ● ● ● ● ● Implemented in Scala AsyncHttpClient, Netty Akka Architecture details Example actor