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The order of the elements doesn’t really matter, but it’s easy to rearrange
them. Simply drag the elements to the proper position and answer "Insert
Before", "Insert After", or "Add as Child". Here I’ve dragged "HTTP Req 2" up
after "HTTP Req 1":

Now let’s check if the response from the "Hello World" servlet really
contains the text "Hello World". First we add a Response Assertion element to
HTTP Req 1:

Then we state that we want to look for the text "Hello World!": 
If the check fails, then the HTTP request will be marked "in error", just as
if an HTTP error like "404" was received. To see the results of the assertion we
add to the Thread Group a Listener for Assertion Results (in the
same way as the other listeners).
Finally, we’ll now add a Timer element to get a more realistic test scenario.
We select a Uniform Random Timer, where the timer delay for each request
is defined as a fixed part plus a variable part:

We set the minimum delay to 2 seconds, and the variable part to 1 second.
This will simulate a user that sits and thinks between 2 and 3 seconds before
giving the next request.

Before we start the run, we define 20 threads (users) starting within 10
seconds (2 per second), and repeating the two HTTP requests 100 times. The test
plan looks like this:

In case something gets out of control it’s always a good idea to save the
test plan before you try to run. Select Aggregate Report so you’re ready
to view the results, and then press Ctrl-R to run.
On my Win98, 866MHz computer with 128MB RAM, I get these figures:
Response times are in milliseconds. The last column is the number of requests
per second (e. g. "HTTP Req 1", 20 users, average response time 0.1 sec = 200
requests per second).
Note that the number of errors is 0%. This means that the assertion reported
OK.
Don’t expect to be able to simulate much more than 20-30 users on a computer
such as I used. I’m running JMeter on the same computer as the web server, and
thread handling in JMeter takes many resources, as we will see shortly.
New on the Java Boutique:
New Review:
Time Management Made Easy with the Quartz Enterprise Job Scheduler
Why not just use the Java timer API? This open source scheduling
API boasts simplicity, ease-of-integration, a well-rounded feature
set, and it's free!
New Applet:
Reverse Complement
Reverse Complement is a simple applet that converts DNA or RNA
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