On 28/09/2009, Ronan Klyne <[email protected]> wrote:
> I have tracked down the flaw in my understanding!
>
> The data I store in the JMeterVariables structure exposed as 'vars' is
> being stored for the duration of the test. I think this is a fault with
> JMeter, as it is of no use once the thread group has finished.
As far as I can tell, the JMeter variables should become available for
garbage collection as soon as the relevant JMeterThread exits. If they
are not (perhaps a circular reference), then this is a bug.
> I have worked
> around this by using a BSF sampler in the logout routine at the end of my
> test, with this javascript (it overwrites selected variable names with
> null.):
>
> """
> OUT.println("Clearing vars.");
> names = [
> 'ws_ids',
> 'container',
> 'can_upload',
> 'multiselect_mod',
> 'document',
> 'no_responses',
> 'navigation_xml_flags_cache',
> ];
> for (var i = 0; i < names.length; i++) {
> vars.put(names[i], null);
Might be better to use
vars.remove(names[i]);
> }
> OUT.println("Cleared vars.");
> """
>
> I hope that helps anyone else running into this problem...
>
>
> Ronan
>
>
> sebb wrote:
>
> > 2009/9/24 Ronan Klyne <[email protected]>:
> >
> >
> > > Hi all,
> > >
> > > I've got a fairly sizeable test plan with several thread groups in in,
> > > configured to run consecutively.
> > >
> > > These thread groups run the same test (a large test, linked to with a
> module
> > > controller) with increasing numbers of users, from 2 to 20, in steps of
> 2.
> > >
> > > I can successfully run the test for 20 users (having disabled the other
> > > thread groups), but I cannot run the full set.
> > > When I run the whole lot together I get memory errors upon reaching the
> 20th
> > > thread group.
> > >
> > >
> >
> > Can you give JMeter more memory?
> >
> >
> >
> > > I can't see any reason why this should be the case, so I come to you for
> > > help... To my knowledge, there should not be any data preserved between
> > > thread groups, and therefore there should be no memory used between
> thread
> > > groups.
> > >
> > > I don't have any Java samplers, but there are a couple of beanshell
> samplers
> > >
> > >
> >
> > There are some reports that BeanShell can leak memory.
> >
> >
> >
> > > and pre/post processors for which I have checked the code and found no
> > > variables that would be left around aside from those I put in the
> > > JMeterVariables construct exposed as 'vars', which are meant to be
> cleaned
> > > between thread groups, if I understand correctly.
> > >
> > > I have also removed all listeners except one data writer.
> > >
> > > I cannot explain why I can run tests independently, but I can't run them
> all
> > > in one JMeter process. Any ideas?
> > >
> > >
> >
> > If you can't fix the problem, why not create a test with a single
> > thread group, and use a property to define the thread count.
> >
> > You can then create a script to run the test repeatedly, passing in
> > the appropriate thread count.
> >
> >
> >
> > > Thanks in advance,
> > >
> > > Ronan
> > >
> > >
> > >
> > >
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> > >
> >
> >
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