How to fire 10 requests per second in jmeter

jmeter

How to fire 10 requests per second instead of waiting for previous threads to complete in jmeter.

Need to hit 1000 times,

Currently the below configuration in Thread Group,
Number of users : 10
Loop :100

I guess the thread is waiting to get response even after second.

But I need to fire 10 requests per second irrespective of response.

Constant Throughput Timer will be useful to do this ?
if that is the case what configuration I should provide .

Any help is highly appreciated..

Best Answer

Yes, Constant Throughput Timer will definitely help.

Put 600 in Target Throughput field (10 requests/second * 60 seconds)
Change "Calculate Throughput based on" to be All active threads
Make sure that you have enough threads. Personally I would increase it at least to 20 as JMeter is not capable of kicking off extra threads to generate the requested throughput, it can only pause threads to limit the load to defined value
Make sure that your tests lasts long enough. Constant Throughput Timer is quite accurate on "minute" level so your test needs to last for at least 1 minute. Also consider reasonable ramp-up and ramp-down values to avoid "spikes"

See How to use JMeter's Throughput Constant Timer guide for more detailed explanations and instructions.

By the way, there is an enhanced version called Throughput Shaping Timer available at JMeter Plugins bundle, maybe it'll be easier to use.

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You could use ConstantThroughputTimer.

Quote from JMeter help files below:

18.6.4 Constant Throughput Timer This timer introduces variable pauses, calculated to keep the total throughput (in terms of samples per minute) as close as possible to a give figure. Of course the throughput will be lower if the server is not capable of handling it, or if other timers or time-consuming test elements prevent it. N.B. although the Timer is called the Constant Throughput timer, the throughput value does not need to be constant. It can be defined in terms of a variable or function call, and the value can be changed during a test.

For example I've used it to generate 40 requests per second:

 <ConstantThroughputTimer guiclass="TestBeanGUI" testclass="ConstantThroughputTimer" testname="Constant Throughput Timer" enabled="true">
      <stringProp name="calcMode">all active threads in current thread group</stringProp>
      <doubleProp>
        <name>throughput</name>
        <value>2400.0</value>
        <savedValue>0.0</savedValue>
      </doubleProp>
    </ConstantThroughputTimer>

And thats a summary:

Created the tree successfully using performance/search-performance.jmx
Starting the test @ Tue Mar 15 16:28:39 CET 2011 (1300202919244)
Waiting for possible shutdown message on port 4445
Generate Summary Results +  3247 in  80,3s =   40,4/s Avg:    18 Min:     0 Max:  1328 Err:   108 (3,33%)
Generate Summary Results +  7199 in 180,0s =   40,0/s Avg:    15 Min:     1 Max:  2071 Err:   378 (5,25%)
Generate Summary Results = 10446 in 260,3s =   40,1/s Avg:    16 Min:     0 Max:  2071 Err:   486 (4,65%)
Generate Summary Results +  7200 in 180,0s =   40,0/s Avg:    14 Min:     0 Max:   152 Err:   399 (5,54%)
Generate Summary Results = 17646 in 440,4s =   40,1/s Avg:    15 Min:     0 Max:  2071 Err:   885 (5,02%)
Generate Summary Results +  7199 in 180,0s =   40,0/s Avg:    14 Min:     0 Max:  1797 Err:   436 (6,06%)
Generate Summary Results = 24845 in 620,4s =   40,0/s Avg:    15 Min:     0 Max:  2071 Err:  1321 (5,32%)

But I run this test inside my network.

Best Answer

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