https://issues.apache.org/bugzilla/show_bug.cgi?id=48901
Summary: Endless wait on Synchronizing Timer
Product: JMeter
Version: 2.3.2
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: normal
Priority: P2
Component: HTTP
AssignedTo: [email protected]
ReportedBy: [email protected]
All the threads will perform endless wait by adding Synchronizing Timer.
This issue is much easier reproduced under a heavy load. I was using 100
threads to a simple HTTP request sampler with adding a Synchronizing Timer,
Groupsize set to 100 as well.
please see the attachment which is the stack trace of 100 threads doing a
endless wait.
Some initial invstigation for this issue:
Here is the current source code:
public long delay() {
synchronized (sync) {
timerCounter[0]++;
final int groupSz = getGroupSize();
final int count = timerCounter[0];
if (
(groupSz == 0 && count >=
JMeterContextService.getNumberOfThreads())
||
(groupSz > 0 && count >= groupSz)
) {
sync.notifyAll();
} else {
try {
sync.wait();
} catch (InterruptedException e) {
log.warn(e.getLocalizedMessage());
}
}
timerCounter[0]=0; // Reset for next time
}
return 0;
}
The main problem from my perspective is after one thread call sync.notifyAll();
,which means after the lock has been released,it will execute
timerCounter[0]=0;(correct me if i am wrong)
After chaning the code as following(move "timerCounter[0]=0;" in front of
"sync.notifyAll();", it does not impact any business impact, but make more
sense to me), and the issue disappear:
public long delay() {
synchronized (sync) {
timerCounter[0]++;
final int groupSz = getGroupSize();
final int count = timerCounter[0];
if (
(groupSz == 0 && count >=
JMeterContextService.getNumberOfThreads())
||
(groupSz > 0 && count >= groupSz)
) {
timerCounter[0]=0; // Reset for next time
sync.notifyAll();
} else {
try {
sync.wait();
} catch (InterruptedException e) {
log.warn(e.getLocalizedMessage());
}
}
}
return 0;
}
Please review the code and make according changes with this issue. BTW,It can
be reproduced on 2.3.4 release as well.
Hope this helps!
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