Re: [EsiGate-devel] Thread locked under load

[Alexis T. <ale...@sm...>]

Last year, in esigate-app-aggregator, i wrote a PerformanceTestCase 
(esigate-app-aggregator/src/test/java/org/esigate/test/cases/PerformanceTestCase.java) 
that allow to test in multithreading mode.  It should be great to 
reproduce this issue in this test case.

This test case is automatically run during a mvn install, but you can 
run this test by invoking *mvn integration-test.

*Ouput result can be found in 
esigate-app-aggregator//target/failsafe-reports/org.esigate.test.cases.PerformanceTestCase.txt



Le 21/03/2012 15:23, François-Xavier Bonnet a écrit :
> OK, so we should wrap the TreeSet and HashMap used in Output class 
> using Collections.synchronizedSortedSet(...) and 
> Collections.synchronizedMap(...)
> Nicolas, can you check that it fixes the problem ?
>
> Le 21/03/2012 15:10, Alexis Thaveau a écrit :
>> http://java.dzone.com/articles/concurrency-and-hashmap
>>
>> Le 21/03/2012 15:08, Alexis Thaveau a écrit :
>>> The main bug is that headers.put is called by several threads at 
>>> same time. As you said, thread are still runnable,  i think map is 
>>> broken, and result is a kind of infinite loop.
>>>
>>>
>>>
>>>
>>>
>>> Le 21/03/2012 14:53, François-Xavier Bonnet a écrit :
>>>> This is a real problem but do you think it can explain the 100% CPU ?
>>>> Shouldn't we have some ConcurrentModificationException ?
>>>> Cordialement,
>>>>
>>>> François-Xavier Bonnet
>>>> Responsable de production
>>>> Smile - Open Source Solutions
>>>> www.smile.fr
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>>>> Le 21/03/2012 11:52, Alexis Thaveau a écrit :
>>>>> Hi,
>>>>>
>>>>> Implementation of TreeSet is not synchronized => not thread safe. 
>>>>> http://docs.oracle.com/javase/6/docs/api/java/util/TreeSet.html
>>>>> TreeSet must be wrapped with Collections.synchronizedSortedSet || 
>>>>> <http://docs.oracle.com/javase/6/docs/api/java/util/Collections.html#synchronizedSortedSet%28java.util.SortedSet%29>
>>>>>
>>>>>
>>>>> Le 21/03/2012 11:44, Nicolas Richeton a écrit :
>>>>>> Hi all
>>>>>>
>>>>>> We have an issue with with ESIGate 2.19 under load, resulting to 100% cpu usage and lock.
>>>>>>
>>>>>> Please have a look to :
>>>>>> http://sourceforge.net/apps/mantisbt/webassembletool/view.php?id=84
>>>>>>
>>>>>> We have the setup show the issue, but not easy to test. Problem arises after several hours.
>>>>>>
>>>>>> This seems to be linked to the new cache system because older versions of ESIGate did not show any locking under heavy load.
>>>>>>
>>>>>> Andreii : any idea/comments on this issue ?
>>>>>>
>>>>>> Nicolas
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>>>>>
>>>>> -- 
>>>>> Alexis Thaveau
>>>>> Agence Nantes
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>>> Alexis Thaveau
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>>
>> -- 
>> Alexis Thaveau
>> Agence Nantes
>> Smile - Open Source Solutions
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-- 
Alexis Thaveau
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