Data driven tests within the distributed Grinder Tester Cluster

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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