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grinderjvms=2 grinderthreads=25 grindertimes=10
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A simple multiplication of these three numbers shows that this test scenario will generate 500 requests per URL
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There are two other parameters that also help to better simulate the workload from real users grindersleepMillis and grinderinitialSleepTimes
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grinder sleepMillis is the time that a thread waits in between requests; as we saw earlier, this is best thought of as 'think time' The response time is recorded from the instant the request is started to the time the response is completed, not taking into account the think time The think time allows the Grinder to simulate concurrent HTTP clients, as this situation is similar to real life The grinder initialSleepTimes property allows for a smooth beginning of the test If all the clients start accessing the server at the same time, it can overload the server, which does not correspond to a real-life situation The Grinder starts all the threads at the same time, but each one will wait a number of milliseconds before its first request This number is a random one between 0 and the result of multiplying grinder sleepMillis by grinder initialSleepTimes If we take a look at the output file we can see the resulting initial random number as follows:
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jvmld=0: started at Sun Sep 10 19:35:58 CEST 2000 <I> <CycleThread-run> Random initial wait (millis)=7357 current=[0,0,0] <I> <CycleThread-run> Random initial wait (millis)=1634 current=[0,0,1] <I> <CycleThread-run> Random initial wait (millis)=2713 current=[ 0 , 0,2] <I> <CycleThread-run> Random initial wait (millis)=518 current=[ 0 , 0,3]
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The numbers between brackets are the host ID, JVM ID, and thread ID, identifying the simulated client The test can be run again increasing the think time Common values for this property range between 5 and 25 seconds By increasing the grinder initialSleepTimes property, a smoother start can be obtained This property introduces randomness without compromising the correctness of the recorded performance data
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There are three main properties for specifying the type of work the Grinder has to perform: Q Q Q grindercycleClass grindercycleMethods grindercycleParams
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The grinder cycleClass property indicates the plugin class that will be executed by each thread For HTTP tests, the class provided, com ejbgrinder grinder plugin HttpBmk, will satisfy most testing requirements Other plugin classes (simpleBmk and SimpleEJBBmk) are also provided with this chapter's source code Writing plugins is described in the next sections The grinder cycleMethods property indicates the Java methods of the previous class that the Grinder will call on each step of the cycle The first and the last are always init and end, respectively The rest can be urlO, urll, ur!2, and so on up to urlSO These methods are present in the class com ejbgrinder grinder pluginHttpBmk There must be at least as many methods as the number of URLs you request in each cycle In the example there are three UPvLs to visit, so the property is defined as:
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grindercycleMethods=init,urlO,urll,ur!2,end
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The grinder cycleParams property is passed by the Grinder to the plugin during its initialization In the case of the HttpBmk plugin, which makes the HTTP tests, it contains the following information: Q Whether the plugin should keep and resend cookies sent by the web server in its response The relevant cookie here is the one that keeps the servlet session identifier The parameter is
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[keepSession]true
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Whether the plugin must write the response to an output file This is set up mainly for debug purposes, using the parameter [ logHtml ] false The URLs to be requested by each of the methods previously defined, in the desired order The parameter follows the pattern [urln] http: / / The number (n) associates the URL with the method in the grinder cycleMethods property The string to validate the response from the web server The parameter follows the pattern [okn] validating-string The number (n) associates the string with the corresponding URL
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As a reminder, the value of this property in the previous example is shown here:
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grindercycleParams= \ [keepSession]true,\ [logHtml]false,\ [ur10]http://localhost:7001/loginjsp user=fofito&password=bond007,\ [urll]http://localhost:7001/statusjsp,\ [ur!2]http://localhost:VOOl/logoutjsp,\ [okO]User <t fofito</b> logged i n ! , \ [oklJUser <b>fofito</b> in session,\ [ok2]User <b>fofito</b> logged out!
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The URLs can include a request string In the example, the first URL, urlO, has two parameters in the request string, user=f of ito and password=bond007 The Grinder will request the URL as specified, including the request string In s 11 and 12 these properties will be configured to load-test the programs of the previous chapters
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