jmeter - Constant Throughput Timer generates too much requests

Question

I created a jmeter testplan with a constant throughput timer, but it seems I'm getting way to much responses. instead of 100 im getting 500+, depending on other settings like stoping or continue on error, or response timeout.

I know that the Constant Throughput Timer is not 100% correct and I would understand it, if there are less requests but not why there are more.

I attached the config of my test.

<?xml version="1.0" encoding="UTF-8"?>
<jmeterTestPlan version="1.2" properties="5.0" jmeter="5.4.1-SNAPSHOT c990226">
  <hashTree>
    <TestPlan guiclass="TestPlanGui" testclass="TestPlan" testname="Testplan OneHundred" enabled="true">
      <stringProp name="TestPlan.comments"></stringProp>
      <boolProp name="TestPlan.functional_mode">true</boolProp>
      <boolProp name="TestPlan.tearDown_on_shutdown">true</boolProp>
      <boolProp name="TestPlan.serialize_threadgroups">false</boolProp>
      <elementProp name="TestPlan.user_defined_variables" elementType="Arguments" guiclass="ArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
        <collectionProp name="Arguments.arguments"/>
      </elementProp>
      <stringProp name="TestPlan.user_define_classpath"></stringProp>
    </TestPlan>
    <hashTree>
      <ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="ThreadGroup1" enabled="true">
        <stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
        <elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller" enabled="true">
          <boolProp name="LoopController.continue_forever">false</boolProp>
          <intProp name="LoopController.loops">-1</intProp>
        </elementProp>
        <stringProp name="LoopController.loops">1</stringProp>
        <stringProp name="ThreadGroup.ramp_time">0</stringProp>
        <stringProp name="ThreadGroup.duration">60</stringProp>
        <stringProp name="ThreadGroup.delay">10</stringProp>
        <boolProp name="ThreadGroup.same_user_on_next_iteration">false</boolProp>
        <boolProp name="ThreadGroup.scheduler">true</boolProp>
        <stringProp name="ThreadGroup.num_threads">100</stringProp>
      </ThreadGroup>
      <hashTree>
        <ConstantThroughputTimer guiclass="TestBeanGUI" testclass="ConstantThroughputTimer" testname="Constant Throughput Timer" enabled="true">
          <intProp name="calcMode">1</intProp>
          <doubleProp>
            <name>throughput</name>
            <value>100.0</value>
            <savedValue>0.0</savedValue>
          </doubleProp>
        </ConstantThroughputTimer>
        <hashTree/>
        <HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="GetRequest" enabled="true">
          <elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="Variables pré-définies" enabled="true">
            <collectionProp name="Arguments.arguments">
              <elementProp name="" elementType="HTTPArgument">
                <boolProp name="HTTPArgument.always_encode">false</boolProp>
                <stringProp name="Argument.value"></stringProp>
                <stringProp name="Argument.metadata">=</stringProp>
                <boolProp name="HTTPArgument.use_equals">true</boolProp>
              </elementProp>
            </collectionProp>
          </elementProp>
          <stringProp name="HTTPSampler.domain">traefik_reverse-proxy_1/dashboard</stringProp>
          <stringProp name="HTTPSampler.port">80</stringProp>
          <stringProp name="HTTPSampler.protocol">http</stringProp>
          <stringProp name="HTTPSampler.contentEncoding"></stringProp>
          <stringProp name="HTTPSampler.path"></stringProp>
          <stringProp name="HTTPSampler.method">GET</stringProp>
          <boolProp name="HTTPSampler.follow_redirects">true</boolProp>
          <boolProp name="HTTPSampler.auto_redirects">false</boolProp>
          <boolProp name="HTTPSampler.use_keepalive">true</boolProp>
          <boolProp name="HTTPSampler.DO_MULTIPART_POST">false</boolProp>
          <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
          <stringProp name="HTTPSampler.connect_timeout">0</stringProp>
          <stringProp name="HTTPSampler.response_timeout">0</stringProp>
        </HTTPSamplerProxy>
        <hashTree>
          <HeaderManager guiclass="HeaderPanel" testclass="HeaderManager" testname="HTTP Header Manager" enabled="true">
            <collectionProp name="HeaderManager.headers">
              <elementProp name="" elementType="Header">
                <stringProp name="Header.name">Host</stringProp>
                <stringProp name="Header.value">fend</stringProp>
              </elementProp>
            </collectionProp>
          </HeaderManager>
          <hashTree/>
          <ResultCollector guiclass="StatVisualizer" testclass="ResultCollector" testname="Aggregate Report" enabled="true">
            <boolProp name="ResultCollector.error_logging">false</boolProp>
            <objProp>
              <name>saveConfig</name>
              <value class="SampleSaveConfiguration">
                <time>true</time>
                <latency>true</latency>
                <timestamp>true</timestamp>
                <success>true</success>
                <label>true</label>
                <code>true</code>
                <message>true</message>
                <threadName>true</threadName>
                <dataType>true</dataType>
                <encoding>false</encoding>
                <assertions>true</assertions>
                <subresults>true</subresults>
                <responseData>false</responseData>
                <samplerData>false</samplerData>
                <xml>false</xml>
                <fieldNames>true</fieldNames>
                <responseHeaders>false</responseHeaders>
                <requestHeaders>false</requestHeaders>
                <responseDataOnError>false</responseDataOnError>
                <saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
                <assertionsResultsToSave>0</assertionsResultsToSave>
                <bytes>true</bytes>
                <sentBytes>true</sentBytes>
                <url>true</url>
                <threadCounts>true</threadCounts>
                <idleTime>true</idleTime>
                <connectTime>true</connectTime>
              </value>
            </objProp>
            <stringProp name="filename">/masterdata/results/auth/de/response_one_get.csv</stringProp>
          </ResultCollector>
          <hashTree/>
        </hashTree>
      </hashTree>
    </hashTree>
  </hashTree>
</jmeterTestPlan>

question from:https://stackoverflow.com/questions/65898492/constant-throughput-timer-generates-too-much-requests

Answer 1

Constant Throughput Timer is precise enough at minute level, so if you configure your test to last longer - you will see the throughput going down gradually and after 1st minute it should be throttled to your 100 requests per minute.

If your scenario is to execute 100 requests evenly distributed across one minute you should rather go for Precise Throughput Timer or Throughput Shaping Timer which have immediate effect