Synchronizing Timer in JMeter DSL

[rsiatka]

Hi,

I would like to ask if there are any plans to implement Synchronizing Timer known from JMeter. I want to send multiple requests simultaneously in batches. I know that JMeter allows to synchronize the execution time of the requests using the mentioned timer.

Here are two cases illustrating the problem and expected behavior:

Sample 1 – 2 threads, 3 iterations, Same user on each iteration, no delay

The same effect will be achieved using JMeter DSL - requests are not synchronized (which is perfectly fine when there are no Synchronizing Timer)

    @Test
    public void test1() throws IOException {
        testPlan(
                threadGroup(2, 3,
                        httpSampler("HTTP Request [${__threadNum}-${__counter(TRUE,)}]","https://restcountries.com/v3.1/all")
                        .children(
                                jsr223PostProcessor(s -> s.log.warn(String.valueOf(System.currentTimeMillis()) +
                                        " | " + String.valueOf(s.prev.getConnectTime())))
                        )
                )
        ).run();
    }

Sample 2 – 2 threads, 3 iterations, the same user on each iteration, no delay, with Synchronizing Timer

As you can see the parallel requests start at the same time (with millisecond accuracy)

[rabelenda]

Hello, thank you for bringing this into attention, and providing good context and explanation!

Do you usually just use it with properties set to 0 (number of threads to wait for, and timeout to wait for)? Or do you at some scenarios actually set values for these two properties?

[rsiatka]

To be honest I don’t use „Ramp-up period” set to 0 very oftent. Also the „Timeout in miliseconds” from Synchronizing timer is not used by me fequently, because i always know the numer of executed threads. Nevertheless, this parameter is crucial.
From what i can see if the NUMBER_OF_THRADES % NUMBER_OF_SIMULATED_USER_GROUPOS = 0 then the „Timeout in miliseconds” is not needed – can be set to 0. But for NUMBER_OF_THRADES % NUMBER_OF_SIMULATED_USER_GROUPOS > 0 the „Timeout in miliseconds” must be set to value bigger than 0 if we don’t want to pause infinitely

[rabelenda]

Hello,

We just released a new version which adds synchronizingTimer to the DSL.

Here is the new user guide section.

Regards

[rsiatka]

Quick and perfect. Thank you very much!