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Subject: Re: parallel samplers and nested thread groups
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 <OFD05F6A74.349A424D-ON80257126.00629995-80257126.00638820@mdsuk.com>
From: Greg.Peace@MDSUK.COM
Date: Fri, 3 Mar 2006 18:06:15 +0000
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Thanks Sebb,

I'm simulating hundreds of users (I guess I'll have to look into 
distributed testing) and this is just a small proportion of my test 
script; it will have additional thread groups with different use cases.
I thought I may end up using other samplers (beanshell, Java request or 
Junit) like you said and wrap my four calls in the one sampler. I guess 
this means I would only get the one response time for the sampler with the 
four calls in. Any suggestions on how I could bring back the response 
times from the individual SQL calls and get JMeter to include these in its 
report, would be greatly appreciated.

Many thanks

Greg


sebb <sebbaz@gmail.com> 
03/03/2006 17:49
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Re: parallel samplers and nested thread groups


I don't think that is going to be easy using JMeter

If you are prepared to write some Java code, you could potentially use
the BeanShell Sampler to create 4 threads to run the JDBC queries and
wait for the result.

Or indeed you could create a JUnit parallel testcase to do the work,
and then test this using the JMeter Junit sampler.

How many different users do you want to simulate? And how many
requests will each make?

S.
On 03/03/06, Greg.Peace@mdsuk.com <Greg.Peace@mdsuk.com> wrote:
> Sorry if my mail was confusing.
>
> The test is simulating the JDBC calls being an EJB application, where we
> have a logon page followed by one of three possible summary pages. The
> logon page is built from one SQL statement, the summary pages 5
> statements. For the summary page we have one initial SQL statement 
issued
> on its own, then four simultaneous statements. I wanted to replicate the
> JDBC behaviour in the test plan. I guess I won't be able to, because I
> already have a thread and this can't issue simultaneous requests needed 
by
> the 4 parallel statements used in the summary page. Is this right ?
>
> By the way thanks for the quick response.
>
> Greg
>
>
>
>
>
> sebb <sebbaz@gmail.com>
> 03/03/2006 14:18
> Please respond to
> "JMeter Users List" <jmeter-user@jakarta.apache.org>
>
>
> To
> "JMeter Users List" <jmeter-user@jakarta.apache.org>
> cc
>
> Subject
> Re: parallel samplers and nested thread groups
>
>
>
>
>
>
> Not sure I understand the bit about 4 simultaneous JDBC requests - is
> that for one login, or 4 separate logins?
>
> A given thread (user) can only do one request at a time.
>
> S.
> On 03/03/06, Greg.Peace@mdsuk.com <Greg.Peace@mdsuk.com> wrote:
> > Hi,
> >
> > In my load I want to test the following scenario as JDBC requests.
> >
> > As a one off the user logs in (there's one JDBC request attributed to
> > this) they can then view either a level one, level two or level three
> > summary screen with (60% 30% or 10%) probability for each. Each 
summary
> > screen is built via an initial JDBC request/SQL statement (for the
> header)
> > followed by say 4 simultaneous JDBC requests.
> >
> > I've got myself really confused trying to implement this as a JMeter
> > testplan.
> >
> > I guess I can use a mixture of  a once only controller and the
> throughout
> > controller to simulate the logon, and probabilistic 'level ? summary'
> > .selection.  However I'm thrown as to how I then implement the summary
> > screen samplers, i.e. the single request followed by 4 simultaneous
> > requests. At first I hoped to use a nested thread group, however from
> > previous threads I understand this isn't possible.
> >
> > Please tell me I've missed another nice trick.
> >
> > Many thanks
> >
> > Greg
> >
>
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