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From sebb <seb...@gmail.com>
Subject Re: How can JMeter variables be shared between thread groups?
Date Tue, 13 Nov 2007 03:17:17 GMT
On 13/11/2007, Sonam Chauhan <sonam.chauhan@ce.com.au> wrote:
> Hi Sebb:
>
> > That should work. At the very least the property should be set to
> >
> > ${some_jmeter_variable }
> Yes, that's what the string that it evaluates to.
>
> > BTW, is the trailing space present in the test plan?
> Sorry for the confusion, the trailing space wasn't in the test plan.
>
>
> I was just gonna write to say I tried the 'User Defined Variables'
> Config Element instead of the 'User Parameter' Pre-Processor, and it got
> it working (along with what appears to be a bug).

RE is a Post-Processor, and happens after a sample.

User Parameters is a Pre-Processor, and only happens before a sample.

> Here's my test plan:
> -------------------------------------
> Thread 1 (1 thread)
> - HTTP Sampler 1
>  --  Regex Extractor 1(Initialize some_jmeter_variable)
> - User Defined Variables 1 (Set some_property = some_jmeter_variable)
> - HTTP Sampler 2 (Dummy Request that uses property set above)

You could just use a Java Request with the __setProperty() in one of the fields.

> Thread 2 (multiple threads)
> - HTTP Sampler 3 (Real request that uses property set above)
> -------------------------------------
>
> This finally does work.
>
> 'HTTP Sampler 2' is just a dummy request that appears to 'fix' the
> property set in thread 1. If I remove that sampler, the property appears
> as '${some_jmeter_variable}' (instead of the JMeter variable's value)
> the second thread group.
>
> Is this a bug? I am using 2.1.1.
>
> Kind regards,
> Sonam Chauhan
> --
> Corporate Express Australia Ltd.
> Phone: +61-2-93350725, Email: sonam.chauhan@ce.com.au
>
> -----Original Message-----
> From: sebb [mailto:sebbaz@gmail.com]
> Sent: Tuesday, 13 November 2007 1:58 PM
> To: JMeter Users List
> Subject: Re: How can JMeter variables be shared between thread groups?
>
> On 13/11/2007, Sonam Chauhan <sonam.chauhan@ce.com.au> wrote:
> > Thanks Sebb.
> >
> > > JMeter properties are gobal. You can use the __setProperty()
> function
> > > to set a property.
> >
> > Can I set a property to the value of a JMeter variable? I tried the
>
> Yes.
>
> > following in a User Parameter element, but it doesn't seem to work (at
> > least in 2.1.1):
> >
> >        ${__setProperty(some_property,${some_jmeter_variable })}
>
> That should work. At the very least the property should be set to
>
>  ${some_jmeter_variable }
>
> Check jmeter.log
>
> BTW, is the trailing space present in the test plan?
>
> > Is there any other way to exchange run-time data between threads?
>
> Not without using BeanShell or otherwise writing code.
>
> Threads are supposed to be independent ...
>
> > Kind regards,
>
> > Sonam Chauhan
> > --
> > Corporate Express Australia Ltd.
> > Phone: +61-2-93350725, Email: sonam.chauhan@ce.com.au
> >
> > -----Original Message-----
> > From: sebb [mailto:sebbaz@gmail.com]
> > Sent: Tuesday, 13 November 2007 1:09 PM
> > To: JMeter Users List
> > Subject: Re: How can JMeter variables be shared between thread groups?
> >
> > On 13/11/2007, Sonam Chauhan <sonam.chauhan@ce.com.au> wrote:
> > > Can JMeter variables be shared between thread groups?
> > >
> >
> > No; JMeter variables are per-thread.
> >
> > The initial settings are copied to all threads when the threads are
> > created; thereafter the variables are independent. That is essential
> > to allow threads to process RE extractors etc independently.
> >
> > JMeter properties are gobal. You can use the __setProperty() function
> > to set a property.
> >
> > >
> > > A regression testcase I am building needs to 'scrape' a variable
> from
> > a
> > > webpage _only once_, then use it the scraped variable in load
> testing
> > > another webservice. So I built a testcase with 2 thread groups with
> > 'Run
> > > each Thread Group separately' ticked in the test plan. The first
> > thread
> > > group runs just one thread - an HTTP request with a Regular
> Expression
> > > Extractor that 'scrapes' a webpage to initializes a JMeter variable
> > > reference.
> > >
> > >
> > >
> > > The second thread has multiple threads using the JMeter variable
> > scraped
> > > from the first thread group. However, I found the JMeter variable is
> > > successfully initialized in the first thread, but not passed to the
> > > second thread group. Is that expected behaviour? I am using JMeter
> > 2.1.1
> > >
> > >
> > >
> > > Kind regards,
> > >
> > > Sonam Chauhan
> > >
> > > --
> > >
> > > Corporate Express Australia Ltd.
> > >
> > > Phone: +61-2-93350725, Email: sonam.chauhan@ce.com.au
> > >
> > >
> > >
> > >
> >
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> >
> >
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> >
> >
>
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