[New feature] Add a new Thread variable named "__jmv_THREAD_START_TIME_ITERATION

[vdaburon]

Description

Add a new unmodifiable JMeter Thread variable named "__jmv_THREAD_START_TIME_ITERATION"

Motivation and Context

It is interesting to know the start timestamp of a thread iteration to calculate cadences or pacing.

How Has This Been Tested?

Yes, add a groovy sampler first sampler of the thread group and compute the delta between the value in the variable __jmv_THREAD_START_TIME_ITERATION and the current time System.currentTimeMillis() in the groovy sampler.

Groovy code:

long currentTime = System.currentTimeMillis();
long startThreadIter = Long.parseLong(vars.get("__jmv_THREAD_START_TIME_ITERATION"));
long delta = currentTime - startThreadIter;
return delta;

Results delta = 0 or 1 ms

Screenshots (if appropriate):

Show the new thread variable in the "Debug Sampler"

Show the Groovy code in the View Results Tree, delta is usually 0 or 1 ms (except for the first call which is a little longer)

Types of changes

• New feature (non-breaking change which adds functionality)

Update documentation: functions.xml
add __jmv_THREAD_START_TIME_ITERATION