https://bz.apache.org/bugzilla/show_bug.cgi?id=58182
Bug ID: 58182
Summary: All Thread Groups do not start at the same time
Product: JMeter
Version: 2.13
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Main
Assignee: [email protected]
Reporter: [email protected]
We have a test plan that has multiple threads groups. Each thread group has
same value for ramp up period and test duration(using variables).
Startup delay is provided as 0.
When test starts we notice that all threads groups are started sequentially and
this leads to test running for longer duration then expected.
As group which was started late will finish later.
Below is one example.
~> grep "Starting thread group number” *
2015/07/22 03:51:45 INFO - jmeter.threads.ThreadGroup: Starting thread group
number 1 threads 31 ramp-up 300 perThread 9677.419 delayedStart=false
2015/07/22 03:52:34 INFO - jmeter.threads.ThreadGroup: Starting thread group
number 2 threads 11 ramp-up 300 perThread 27272.727 delayedStart=false
2015/07/22 03:52:50 INFO - jmeter.threads.ThreadGroup: Starting thread group
number 3 threads 5 ramp-up 300 perThread 60000.0 delayedStart=false
2015/07/22 03:52:58 INFO - jmeter.threads.ThreadGroup: Starting thread group
number 4 threads 2 ramp-up 300 perThread 150000.0 delayedStart=false
2015/07/22 03:53:01 INFO - jmeter.threads.ThreadGroup: Starting thread group
number 5 threads 13 ramp-up 300 perThread 23076.924 delayedStart=false
2015/07/22 03:53:20 INFO - jmeter.threads.ThreadGroup: Starting thread group
number 6 threads 7 ramp-up 300 perThread 42857.145 delayedStart=false
2015/07/22 03:53:31 INFO - jmeter.threads.ThreadGroup: Starting thread group
number 7 threads 5 ramp-up 300 perThread 60000.0 delayedStart=false
2015/07/22 03:53:39 INFO - jmeter.threads.ThreadGroup: Starting thread group
number 8 threads 3 ramp-up 300 perThread 100000.0 delayedStart=false
2015/07/22 03:53:44 INFO - jmeter.threads.ThreadGroup: Starting thread group
number 9 threads 4 ramp-up 300 perThread 75000.0 delayedStart=false
Below is code snippet from org.apache.jmeter.engine.StandardJMeterEngine#run().
while (running && iter.hasNext()) {// for each thread group
AbstractThreadGroup group = iter.next();
.
.
log.info("Starting ThreadGroup: " + groupCount + " : " + groupName);
startThreadGroup(group, groupCount, searcher, testLevelElements, notifier);
.
.
}
org.apache.jmeter.engine.StandardJMeterEngine#startThreadGroup().
private void startThreadGroup(AbstractThreadGroup group, int groupCount,
SearchByClass<?> searcher, List<?> testLevelElements, ListenerNotifier
notifier)
{
.
.
group.start(groupCount, notifier, threadGroupTree, this);
}
and ThreadGroup.start() method will spawn all threads for a group. So second
group will start once threads are created for first group.
Now one solution I have found is to enable “Delay thread creation until needed”
and set startup delay to some value > 0.
This will run new ThreadStarter thread for each group and all groups will start
at the same time.
Can we have some option to enable parallel start of all thread groups ?
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