Re: [Grinder-use] Bad TPS number reported by the console

[olivier m. <ome...@gm...>]

Hello Phil,

I see better where the problem is around
This has nothing to do with overloaded method but to the scope of
instrumentation when we have dynamic instrumentation.
The Test( ).record(impl.sendData) is dynamic and re-evaluated at each run.
The proof is below:

The code logic is the following:

__call__
    foreach line of scenario:

         # get the protocol implementation
         # this can be ejb, http, http apache, database, command ...
         #
         impl.getImplementation()

(...)
         # for debugging
         impl.setFullRunID(fullIDWithLine)

          # for load balancing on any criteria
         impl.setProcessID(processNumber)
         impl.setThreadID(threadNumber)
         impl.setRunID(runNumber)
         impl.setLineID(iCntProcessed)

(...)
          #  replace data with all templates and contextual data (memorized
data from previous call)
          submitCmd = impl.newProcessLine(line, self.memMgr)

(...)
           # ======= Tests are dynamic !
           if testNumbers.has_key(line.getTestName()):
               testId = testNumbers[line.getTestName()]
           else:
               testId = processNumber*testRangeSize+len(testNumbers)+1
               testNumbers[line.getTestName()] = testId

(...)
         Test(testId, line.getTestName()).record(impl.sendData)
(...)
         spResp = impl.sendData(submitCmd, ...)

If i run for 10 runs in one thread, i get 64 success test which is exactly
:  1 + 7x9
The run=0, instruments only one call (impl.senData) - because the Test is
created just before the call.
For each run>0, the instrumentation record each call to impl although it
should record impl.sendData only.

To be completely sure of this behavior, i have commented out 5 impl.xxx
calls above and i have got 19 transactions recorded as successful.
1+2x9=19

This proves that the instrumentation does not apply to the impl.sendData()
method but the whole object impl.

The question is :
Could we consider this as a bug ?
The same code was working with version <= 3.5 with the getattr() method.

Do you see a workaround i could apply ?


Thanks again for your help,
Olivier




2013/10/12 Philip Aston <ph...@ma...>

>  No, there's no way to trace what is instrumented. There should be -
> please open a Feature Request.
>
> So you are now definitely instrumenting the sendData method and not the
> getattr result? (E.g. Test(...).record(impl.sendData))
>
> If so, is sendData() overloaded - are there many variants of the sendData
> method?
>
> - Phil
>
>
> On 11/10/13 17:45, olivier merlin wrote:
>
> Hello Phil,
>
>  I really don't understand, i have used your new instrumentation method
> and i have still the problem
> if i launch one thread with 2 runs, i have:
>  Thread, Run, Test, Start time (ms since Epoch), Test time, Errors, SyncML
> 0, 0, 1, 1381509722862, 1, 0, 0.0
> 0, 1, 1, 1381509722867, 0, 0, 0.0
> 0, 1, 1, 1381509722867, 0, 0, 0.0
> 0, 1, 1, 1381509722867, 0, 0, 0.0
> 0, 1, 1, 1381509722867, 0, 0, 0.0
> 0, 1, 1, 1381509722867, 0, 0, 0.0
> 0, 1, 1, 1381509722867, 2, 0, 0.0
> 0, 1, 1, 1381509722871, 0, 0, 0.0
>
>  as you can see, the run 1 is executed 7 times.
> Very strange ??
> Do you have an idea on how i can trace the instrumentation ?
>
>  cheers,
> Olivier
>
>
> 2013/10/6 Philip Aston <ph...@ma...>
>
>>  This is to do with what you are instrumenting, not the logging.
>>
>> getattr will return some internal Jython object that represents the bound
>> method. You're instrumenting all methods of this internal Jython object.
>> When you invoke it, the call path is crossing multiple (7!) instrumented
>> methods, but that's completely down to how Jython is implemented.
>>
>> Instead I think you should try to instrument the sendData method itself.
>> Try something like:
>>
>> Test(...).record(impl.sendData)
>>
>> ...
>>
>> spResp = impl.sendData(....)
>>
>>
>> - Phil
>>
>>
>>
>>
>>
>> On 02/10/13 10:35, olivier merlin wrote:
>>
>> Hello,
>>
>>  I try to switch our grinder framework to grinder 3.11 and i get a
>> problem on the TPS count.
>>
>>  When i inject a constant rate of 3 TPS, after a period of X minutes,
>> the console write a throughput of 21 TPS so x7 the real throughput.
>>
>>  When looking in the grinder-data_X.log file i see that 3 thread per
>> second is there but each threads write in the data log 7 times !
>>
>>  I'm quite sure it's a problem of instrumentation somewhere similar to
>> the bug entered by Phil on the #234  helloworld sample double counts<http://sourceforge.net/p/grinder/bugs/234/>
>>
>>  *We are using the old way for instrumenting:*
>> (...)
>>  testSubmit = Test(testId, line.getTestName()).wrap(getattr(impl,
>> "sendData"))
>>  (...)
>> spResp = testSubmit(submitCmd, line.isMemorized(),line.getLastTemplate(),
>> self.memMgr)
>>  (...)
>>
>>  The impl is a protocol implementation that may change between test -
>> that implements sendData() method.
>> The problem is perhaps that i switch the logs to logback
>>  (grinder.logger) in all the implementations (like the #234) ... thus
>> leading to a test record for each logging ?
>>
>>  Do i have to completely change my way of instrumenting ?
>> Or do i have to use distinct logger from the grinder.logger to avoid this
>> king of problem ...
>>
>>  Does someone encounter the same trouble ?
>>
>>  cheers,
>> Olivier
>>
>>
>
>
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