1 Load Testing with JMeter Presented by Matthew Stout -
2 JMeter Overview Java application for load testing and measuring performance Originally for web applications but has grown to support lots of other functions, SQL, Java, JUnit, SMTP, SOAP, LDAP, etc.
3 JMeter Overview continued Can run on just about any workstation or environment that can run java Has a GUI and non-gui mode GUI for developing and watching tests non-gui for running more load or on numerous hosts/load engines only
4 JMeter Overview continued Server mode for controlled distributed tests Can generate lots of load or be used with just a single user/thread if you are just interested in testing for specific responses or content.
5 JMeter Terms Test Plan The container for all test objects Thread Group and Threads Threads = Users Controllers Containers for grouping Samplers, other elements, add logic (if, random, once only) Samplers Makes Requests Assertions Validations on responses, step results Listeners Reports results/monitors performance Workbench Temporary working area to add some items of temp use -- Proxy recorder, etc
6 JMeter Terms See JMeter Docs for more on components, functions, etc. This workshop is intended to show some real uses and start interest in ITS, so I am not going to go into all the features--docs are out there though
7 Install JMeter Use latest version and latest jre at least 1.6 Can bundle and set your own location for JRE easily on Mac/Unix Very easy see Apache docs or my full presentation on the UCCSC site
8 Install JMeter Typical Load by type of Machine Typical laptop can do users depending on cpu/ram and test elements. Typical Oracle T4-1 can do users depending on test You WILL need to increase the heap settings for larger tests or complex tests with lots of logic or listeners storing results I then run some client/server coordinated tests, or command line non-gui--the later has lowest resource needs Running more instances of smaller tests of users is better as overloading a JMeter install can make results look slow when it is only JMeter
9 Installing JMeter Show an install
10 Ways to Create a Test Hand enter samples/requests Read in URLs from file--log replay Record a test Third party tools
11 Ways to Create a Test - continued However you start you ll need to... Identify scenario or steps & create test Debug, refine, parameterize Add validations/assertions Define load needed and run test Monitor (logs, Listeners, other) Tune/Change App or Systems, retest
12 Ways to Create a Test - continued I often record or start by hand and then use Firefox and Firebug (lots of other good browser debug tools too) Firefox + Firebug
13 Ways to Create a Test - continued Firebug or similar tool helps see the activity and adjust a test faster
14 Hand Entering a Test Simple for basic tests Stress tests of lots of GETs or simple POSTs Not likely used for creating real user transactions that test the real user load-but could be better than no tests
15 Hand Entering a Test Queue up the Live Demo
16 Read URLs from a File Useful for general content sites with no authentication or simple authentication Quick way to replay the actual requests your app gets Can generate lots of random load Not all apps generate URLs in logs that can replay or that are useful for this
17 Read URLs from a File Queue up the Live Demo
18 Recording a Test This is usually where most demos start I wanted to show the previous ways as options to get you doing some load testing with less initial effort All methods can generate load This allows you to record a specific user transaction or experience
19 Recording a Test - continued Specific user transactions more useful for Testing total time and user experience on multiple step processes Many sites require certain steps to set up sessions/authentication More useful if using as a more general testing/release validation tool
20 Recording a Test - continued To play back such a test may take some debugging Most sites require parsing responses for values to send in subsequent requests Use browser or http tracing tools to watch what happens in a real session to debug and add to what happens in JMeter
21 Recording a Test Queue up the Live Demo
22 Summary so far... Lots of ways to start a test Keep evolving the test Remove unneeded cruft and add extractors and assertions to remove errors and check for success Determine load and how you ll monitor Run tests
23 Summary so far... Then once you have a valid test Watch results for sudden spikes, isolate cause, tune one thing, retest Repeat same exact test to measure improvement
24 Assertions Add at least basic assertions Check for strings in response Response code if appropriate Without these it is easy to get a success or OK return from JMeter when really the app may be giving an error (Err Msg, but 200)
25 Ways to Generate Load Single Test Machine Easy to run from laptop or workstation for tests under 250 users or so Use several servers and non-gui call to standalone tests Drawback of no single monitoring point
26 Ways to Generate Load Distributed Test Start client instances and invoke tests from control machine Gives you data collection in a single machine, but that machine is eventually still a bottleneck and needs low latency to remote machines
27 Ways to Generate Load Ideal (or things to consider) Depends on your needs, but would Have clients spread out more like your real users so campus network or ISPs are in the mix if you are trying to simulate what they will see
28 Ways to Generate Load Ideal (or things to consider) continued It is possible to see higher load and slower site with slow users than a load test since they keep processes locked up longer on connections than a fast connection
29 Ways to Generate Load Ideal (or things to consider) continued We are exploring VMs and Cloud instances for simulating more unique sources that are more distributed from our site
30 Ways to Monitor Performance JMeter Aggregate Report Summary min, max, average of all samples Aggregate Graph -- graph of same data
31 Ways to Monitor Performance JMeter Plugins from have some improved graphs System Logs web server access logs -- add timetaken and compare responses from the real peak times of year/events
32 Ways to Monitor Performance System Monitoring Use system monitoring tools and scripts -- Shinken/Nagios/Cacti, others, or use scripts to capture system metrics (cpu, load, memory), connections, etc. every minute or so
33 Some more Fun Examples I wanted this workshop to show the possibilities and inspire others to use the tool so I have some more uses... SQL, SMTP, Shibboleth Login, Distributed tests, real tests we use, set off some pagers...
34 Some more Fun Examples SQL/JDBC If your platform has JDBC driver likely can run this kind of test Run SQL statements Has some issues with large responses when your load generator is on slow network
35 Some more Fun Examples - JDBC
36 Some more Fun Examples SMTP Sampler Had to include this after it was advertised that I use JMeter with my (be careful when challenging Sys/App Admins)
37 Some more Fun Examples - SMTP
38 Some more Fun Examples Distributed Test - More Loaded Remote server mode More control/visibility Simple non-gui across many machines Lowest resources
39 Some more Fun Examples Distributed Test - More Loaded See Apache for Setup: org/usermanual/jmeter_distributed_testing_step_by_step.pdf
40 Fun Examples - Distributed Test
41 Some more Fun Examples Shib Authentication Yes we finally have working examples One for a simplesaml.php and the package install--slightly different Demo!
42 Some more Fun Examples Nagios Plugin? Maybe In development I have a simple plugin that invokes a test, loads the results, checks for errors, total time and returns codes for warn, critical, ok, etc.
43 Resources The Encyclopedia, source, mothership: Blazemeter - browser recorder, blog, a couple good training videos
44 Resources Blazemeter Youtube Blazemeter Blog (some are for their products, but also some JMeter)
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