Re: Data driven tests within the distributed Grinder TesterCluster

Hi Lawrence,

> My Question:
>  How does a thread determine which username/password to use from the file?

By itself, the thread doesn't.  You have to write utility code (cvs/xml feeders) to tell the thread how you want it to access and use the external test data.  There are many ways to have grinder help you script this, as was recommended by Oliver.

Depending on your requirements, you may want to consider an algorithm that ensures each agent uses unique user/passwords.  Avoid each agent picking the same user/password pair for each thread.

The grinder scripting API will let you grab any grinder.properties, for example grinder.threads (total threads).  As well as access the current grinder thread via grinder.threadNumber.

Does that help you on your way?

Happy Grinding ;-)

Ouray Viney
www.viney.ca

> On Mar 10, 2014, at 2:53 PM, Olivier <[email protected]> wrote:
> 
> Hello,
> From my knowledge, you don't have this information directly. One solution is to pilot grinder with the Restful api and so pass a parameter like grinder.agents with the number of agents involved.
> Another option: grinder.agentNumber,grinder.processNumber,grinder.threadNumber is unique - you have your user identifier.
> Olivier
> De : Lawrence Schapker
> Envoyé : ‎10/‎03/‎2014 17:36
> À : [email protected]
> Objet : [Grinder-use] Data driven tests within the distributed Grinder TesterCluster
> 
> Hello Everyone,
> 
> I am setting up clustered "Distributed Grinder" test environment here and am having some questions.
> 
> Our environment will be having 5 agents connecting to a console.  We will be passing 1 grinder script to the agents (which will include the test data necessary to execute the script).  For this test, each thread will need its own unique username and password to log into the system under test (which these usernames and passwords would reside within one of the data files passed to each agent).
> 
> My Question:
>  How does a thread determine which username/password to use from the file?
> 
> For a thread to know which to use, it has to know 2 "things":  How many total threads will be used for the test; and where within that total does this thread reside.
> 
> From the Grinder Java docs, I found "Grinder.ScriptContext" interface which I resume will give me the "where within that total does this thread reside" (as long as I find the correct class implementing this interface).
> 
> I cannot seem to find the "How many total threads will be used for the test" portion.  I presume that I need "the number of agents connected to the console", "Number of total processes, or the number of processes per agent (i.e. # of workers)", and "the total number of worker threads or the number of threads per worker."
> 
> I believe that with this information, a thread should be able to calculate what data it needs from the single data source (by also using the "run/iteration number").  I'm guessing that I can get the number of processes (i.e. workers), and threads (per worker) from the properties being passed in.  But how do I get the number of agents connected?
> 
> If I'm off in my perception, please clarify things for me <grin>.
> 
> Thanks,
> 
> Larry Schapker
> Senior Performance Engineer
> Salesforce.com
> 
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