probability for each thread group - jmeter

Question

If I have 3 thread groups in my test plan, how can I set the constant probability (request weights) for each group?
I'm a novice in JMeter. Could you, please, show your settings on the screenshots?

Answer 1

Well just set the number of threads of each group to a factor of the total threads of your test.
If 100 VUs, set 50 for g1, 30 for g2 and 20 for g3.
To make it dynamic you can use BeanShell function, you would set Number of Threads to:
${__BeanShell(50*${USERS}/100)}
And would use a User Defined Variables containing:
USERS : ${__P(USERS, 10)} // for 10 users by default,
USERS can then be passed as a Command line options:
-JUSERS=100
Sample:
<?xml version="1.0" encoding="UTF-8"?>
<jmeterTestPlan version="1.2" properties="2.4" jmeter="2.9-SNAPSHOT.20121216">
<hashTree>
<TestPlan guiclass="TestPlanGui" testclass="TestPlan" testname="Test Plan" enabled="true">
<stringProp name="TestPlan.comments"></stringProp>
<boolProp name="TestPlan.functional_mode">false</boolProp>
<boolProp name="TestPlan.serialize_threadgroups">false</boolProp>
<elementProp name="TestPlan.user_defined_variables" elementType="Arguments" guiclass="ArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
<collectionProp name="Arguments.arguments"/>
</elementProp>
<stringProp name="TestPlan.user_define_classpath"></stringProp>
</TestPlan>
<hashTree>
<Arguments guiclass="ArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
<collectionProp name="Arguments.arguments">
<elementProp name="USERS" elementType="Argument">
<stringProp name="Argument.name">USERS</stringProp>
<stringProp name="Argument.value">${__P(USERS, 20)}</stringProp>
<stringProp name="Argument.metadata">=</stringProp>
<stringProp name="Argument.desc">20 is default, to change it on command line -JUSERS=30</stringProp>
</elementProp>
</collectionProp>
</Arguments>
<hashTree/>
<ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="Run50Pct" 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>
<stringProp name="LoopController.loops">1</stringProp>
</elementProp>
<stringProp name="ThreadGroup.num_threads">${__BeanShell(50*${USERS}/100)}</stringProp>
<stringProp name="ThreadGroup.ramp_time">1</stringProp>
<longProp name="ThreadGroup.start_time">1356191395000</longProp>
<longProp name="ThreadGroup.end_time">1356191395000</longProp>
<boolProp name="ThreadGroup.scheduler">false</boolProp>
<stringProp name="ThreadGroup.duration"></stringProp>
<stringProp name="ThreadGroup.delay"></stringProp>
</ThreadGroup>
<hashTree>
<DebugSampler guiclass="TestBeanGUI" testclass="DebugSampler" testname="DS1" enabled="true">
<boolProp name="displayJMeterProperties">false</boolProp>
<boolProp name="displayJMeterVariables">true</boolProp>
<boolProp name="displaySystemProperties">false</boolProp>
</DebugSampler>
<hashTree/>
</hashTree>
<ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="Run20Pct" 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>
<stringProp name="LoopController.loops">1</stringProp>
</elementProp>
<stringProp name="ThreadGroup.num_threads">${__BeanShell(20*${USERS}/100)}</stringProp>
<stringProp name="ThreadGroup.ramp_time">1</stringProp>
<longProp name="ThreadGroup.start_time">1356191395000</longProp>
<longProp name="ThreadGroup.end_time">1356191395000</longProp>
<boolProp name="ThreadGroup.scheduler">false</boolProp>
<stringProp name="ThreadGroup.duration"></stringProp>
<stringProp name="ThreadGroup.delay"></stringProp>
</ThreadGroup>
<hashTree>
<DebugSampler guiclass="TestBeanGUI" testclass="DebugSampler" testname="DS2" enabled="true">
<boolProp name="displayJMeterProperties">false</boolProp>
<boolProp name="displayJMeterVariables">true</boolProp>
<boolProp name="displaySystemProperties">false</boolProp>
</DebugSampler>
<hashTree/>
</hashTree>
<ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="Run30Pct" 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>
<stringProp name="LoopController.loops">1</stringProp>
</elementProp>
<stringProp name="ThreadGroup.num_threads">${__BeanShell(30*${USERS}/100)}</stringProp>
<stringProp name="ThreadGroup.ramp_time">1</stringProp>
<longProp name="ThreadGroup.start_time">1356191395000</longProp>
<longProp name="ThreadGroup.end_time">1356191395000</longProp>
<boolProp name="ThreadGroup.scheduler">false</boolProp>
<stringProp name="ThreadGroup.duration"></stringProp>
<stringProp name="ThreadGroup.delay"></stringProp>
</ThreadGroup>
<hashTree>
<DebugSampler guiclass="TestBeanGUI" testclass="DebugSampler" testname="DS3" enabled="true">
<boolProp name="displayJMeterProperties">false</boolProp>
<boolProp name="displayJMeterVariables">true</boolProp>
<boolProp name="displaySystemProperties">false</boolProp>
</DebugSampler>
<hashTree/>
</hashTree>
<ResultCollector guiclass="ViewResultsFullVisualizer" testclass="ResultCollector" testname="View Results Tree" enabled="false">
<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>false</message>
<threadName>true</threadName>
<dataType>false</dataType>
<encoding>false</encoding>
<assertions>false</assertions>
<subresults>false</subresults>
<responseData>false</responseData>
<samplerData>false</samplerData>
<xml>false</xml>
<fieldNames>true</fieldNames>
<responseHeaders>false</responseHeaders>
<requestHeaders>false</requestHeaders>
<responseDataOnError>false</responseDataOnError>
<saveAssertionResultsFailureMessage>false</saveAssertionResultsFailureMessage>
<assertionsResultsToSave>0</assertionsResultsToSave>
<bytes>true</bytes>
<hostname>true</hostname>
<threadCounts>true</threadCounts>
<sampleCount>true</sampleCount>
</value>
</objProp>
<stringProp name="filename"></stringProp>
</ResultCollector>
<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>false</message>
<threadName>true</threadName>
<dataType>false</dataType>
<encoding>false</encoding>
<assertions>false</assertions>
<subresults>false</subresults>
<responseData>false</responseData>
<samplerData>false</samplerData>
<xml>false</xml>
<fieldNames>true</fieldNames>
<responseHeaders>false</responseHeaders>
<requestHeaders>false</requestHeaders>
<responseDataOnError>false</responseDataOnError>
<saveAssertionResultsFailureMessage>false</saveAssertionResultsFailureMessage>
<assertionsResultsToSave>0</assertionsResultsToSave>
<bytes>true</bytes>
<hostname>true</hostname>
<threadCounts>true</threadCounts>
<sampleCount>true</sampleCount>
</value>
</objProp>
<stringProp name="filename"></stringProp>
</ResultCollector>
<hashTree/>
</hashTree>
</hashTree>
</jmeterTestPlan>