https://issues.jenkins-ci.org/browse/JENKINS-34919

On Wednesday, May 18, 2016 at 10:45:44 AM UTC-4, Ugo Bellavance wrote:
>
> We only have 1 Jenkins server so I'll create a JIRA,
>
> Thanks a lot for your help :)!
>
> On Wednesday, May 18, 2016 at 10:40:21 AM UTC-4, Stephen Connolly wrote:
>>
>> If you have no slaves and only run builds on the master then we can 
>> definitively state that JENKINS-34573 is not the root cause. If you have 
>> slaves (even if idle or unused) then we cannot.
>>
>> If you have a definitive answer to the above question then you should 
>> probably create a JIRA
>>
>> On 18 May 2016 at 14:29, Ugo Bellavance <ug...@lubik.ca> wrote:
>>
>>> Hi Stephen,
>>>
>>> We don't use slaves. We only have one master.
>>>
>>> Should I create an issue in JIRA for my specific issue?
>>>
>>> (is there a reason why you got the conservation out of the group?)
>>>
>>> Thanks,
>>>
>>> On Wed, May 18, 2016 at 8:56 AM, Stephen Connolly <
>>> stephen.al...@gmail.com> wrote:
>>>
>>>> Hard to say for certain as that could still be references maintained by 
>>>> the unexported objects that are pending unexport. If you can get your 
>>>> instance into that state and then have it sit idle for a couple of 
>>>> hours... 
>>>> if it is JENKINS-34573 then you should see the retained memory reduce as 
>>>> one reference is cleared every minute. Alternatively disconnect and 
>>>> reconnect all your slaves and see if that frees the memory up - 
>>>> JENKINS-34573 is only an issue for long running busy slaves
>>>>
>>>> On 17 May 2016 at 19:01, Ugo Bellavance <ug...@lubik.ca> wrote:
>>>>
>>>>> Ok, I did analyse the heap dump with Eclipse's Memory Analyzer Tool 
>>>>> and here's what I found:
>>>>>
>>>>> One instance of "java.util.concurrent.ScheduledThreadPoolExecutor" 
>>>>> loaded by "<system class loader>" occupies 6,801,517,856 (89.16%) bytes. 
>>>>> The instance is referenced by 
>>>>> org.tmatesoft.svn.core.wc.DefaultSVNRepositoryPool @ 0x561b36858 , loaded 
>>>>> by "hudson.ClassicPluginStrategy$AntClassLoader2 @ 0x56057c428". The 
>>>>> memory 
>>>>> is accumulated in one instance of 
>>>>> "java.util.concurrent.RunnableScheduledFuture[]" loaded by "<system class 
>>>>> loader>".
>>>>>
>>>>> Does it match JENKINS-34213?
>>>>>
>>>>> On Tuesday, May 17, 2016 at 9:29:16 AM UTC-4, Stephen Connolly wrote:
>>>>>>
>>>>>> Jenkins 2.5 has the fix IIUC
>>>>>>
>>>>>> On 17 May 2016 at 14:28, Stephen Connolly <stephen.al...@gmail.com> 
>>>>>> wrote:
>>>>>>
>>>>>>> It is fixed, but in the latest version of remoting... which is not 
>>>>>>> something you can upgrade without either building a custom build of 
>>>>>>> Jenkins 
>>>>>>> or upgrading Jenkins.
>>>>>>>
>>>>>>> You could crack open your jenkins.war and replace the remoting.jar 
>>>>>>> with the fixed version and seal it back up again and see if that fixes 
>>>>>>> your 
>>>>>>> issue... probably the quickest way to confirm if my theory as to the 
>>>>>>> source 
>>>>>>> of your leak is correct, but you would need to know what you are doing
>>>>>>>
>>>>>>> On 17 May 2016 at 14:14, Ugo Bellavance <ug...@lubik.ca> wrote:
>>>>>>>
>>>>>>>> Thanks, but I can see that this issue is fixed but I don't know how 
>>>>>>>> to update my Jenkins install so that I have the fix.  I'm using 1.656.
>>>>>>>>
>>>>>>>> Ugo
>>>>>>>>
>>>>>>>> On Tuesday, May 17, 2016 at 8:56:34 AM UTC-4, Stephen Connolly 
>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>> I will repeat:
>>>>>>>>>
>>>>>>>>> > I am suspecting JENKINS-34213 may be your issue.
>>>>>>>>>
>>>>>>>>> On 17 May 2016 at 13:12, Ugo Bellavance <ug...@lubik.ca> wrote:
>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Friday, May 13, 2016 at 8:50:56 AM UTC-4, Ugo Bellavance wrote:
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On Thursday, May 12, 2016 at 2:01:41 PM UTC-4, Raymond Accary 
>>>>>>>>>>> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>> Hi,
>>>>>>>>>>>> If it helps, you might avoid the crash by installing the 
>>>>>>>>>>>> monitoring plugin, and triggering garbage collection once the 
>>>>>>>>>>>> memory is 
>>>>>>>>>>>> approaching the maximum allocated heap size. This is a workaround 
>>>>>>>>>>>> until 
>>>>>>>>>>>> someone is able to diagnose the root cause. I have an open issue : 
>>>>>>>>>>>> https://issues.jenkins-ci.org/browse/JENKINS-34573 but thought 
>>>>>>>>>>>> I'd run the suggestion.
>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>> Have anyone monitored the JVM with VisualVM? I have found that 
>>>>>>>>>>> it looks like a specific memory pool may be filling up: Old Gen.  
>>>>>>>>>>> I'm 
>>>>>>>>>>> trying now with:
>>>>>>>>>>>
>>>>>>>>>>> -Djava.awt.headless=true -Dcom.sun.management.jmxremote 
>>>>>>>>>>> -Xms10752m -Xmx10752m -XX:NewRatio=10
>>>>>>>>>>>
>>>>>>>>>>> We'll see in a few days.  In the last few days, the problem have 
>>>>>>>>>>> occured each morning at around 4:45.  I'm not sure if the same jobs 
>>>>>>>>>>> run on 
>>>>>>>>>>> the week-ends as well.
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> From what I can see, it will always fill the memory.  Probably a 
>>>>>>>>>> leak, but I don't know how to be 100% sure about it. When I try to 
>>>>>>>>>> load a 
>>>>>>>>>> heap dump in VisualVM, but it shows nothing except "Not supported 
>>>>>>>>>> for this 
>>>>>>>>>> JVM. 
>>>>>>>>>>
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>>>
>>>
>>>
>>> -- 
>>> Ugo Bellavance (ug...@lubik.ca)
>>>
>>> -- 
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>>
>>

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