Java Monitoring on a VPC

[Vimal Shah]

That makes sense and the script is writing itself! It seems that jmap and
jhat would be good to:
http://www.marcsturlese.com/2009/05/09/analyzing-java-heaps-with-jmap-and-jhat/

To get jvisualvm working, I'm assuming I need to put Gnome on the server
and then use putty with X-windows and forwarding enabled? If this is
correct, are there performance ramifications to adding Gnome? If not, any
references to how to do this?


On Wed, Oct 9, 2013 at 4:19 PM, James Mcphee <jmcphe at gmail.com> wrote:

> You can plot a graph during these times to see if it's spending a lot of
> time in garbage collection.  Other options are to take jstack thread dumps
> and see what the app is up to at that time.
>
> My favorite way to fiddle is to plug VisualVM (replacement for jconsole)
> into the jvm and watch when issues are occuring.  That uses JMX and you can
> monitor threads and mbeans.
>
>
> On Wed, Oct 9, 2013 at 4:13 PM, Vimal Shah <vimals at sokikom.com> wrote:
>
>> jstat works nicely now James. Thank you. I will try the various options
>> as well.
>>
>> A little more about the problem. Every 4-6 weeks the CPU util looks like:
>>
>> [image: Inline image 1]
>>
>>
>> The application slows and Alerts are emailed. The application is
>> restarted (in this case on 10/2 at 1:00). This allows the application to
>> return to normal responsiveness and allows the box itself to go back to 3%
>> CPU util. The ideal tool would be one that would help us understand this.
>> Can jstat be used to investigate this? Would a call trace and heap dump be
>> more useful as identification to the function that was called when this
>> error occurred?
>>
>>
>>
>> On Wed, Oct 9, 2013 at 3:25 PM, James Mcphee <jmcphe at gmail.com> wrote:
>>
>>> For jstat, you have to be a user with permission to the process.  In
>>> this case, either the user the java process is running as, or root.  I use
>>> jstat when I want to script things to watch them on the console.
>>>
>>> For JMX, there are jvm arguments you can use to open it up to external
>>> hosts, provide authentication, etc.  That will depend on the server you're
>>> running and you should consult the documentation for that server.
>>>
>>>
>>> On Wed, Oct 9, 2013 at 3:19 PM, Vimal Shah <vimals at sokikom.com> wrote:
>>>
>>>> James,
>>>>
>>>> What other details can I provide?
>>>>
>>>> It does sound like JMX is the standard. When running jstat with my JAVA
>>>> PID
>>>>
>>>> $ jstat -gc 19326
>>>> Could not attach to 19326
>>>>
>>>> I don't have JMX configured. After some reading it seems that I need to
>>>> get a Mbeans server running. Is this what I have to do?
>>>>
>>>> http://docs.oracle.com/javase/tutorial/jmx/mbeans/standard.html
>>>>
>>>>
>>>> On Wed, Oct 9, 2013 at 1:15 PM, James Mcphee <jmcphe at gmail.com> wrote:
>>>>
>>>>> We'd need more details to give you much more than "Using JMX or jstat
>>>>> would be easiest"
>>>>>
>>>>> Example:
>>>>> ./jstat -gc 27104
>>>>>  S0C    S1C    S0U    S1U      EC       EU        OC         OU
>>>>> PC     PU    YGC     YGCT    FGC    FGCT     GCT
>>>>> 20928.0 21312.0  0.0   4864.0 305728.0 128383.7  262656.0   223537.3
>>>>>  170240.0 130738.6    295    6.912  10      8.268   15.180
>>>>>
>>>>> http://docs.oracle.com/javase/1.5.0/docs/tooldocs/share/jstat.html
>>>>>
>>>>>
>>>>> On Wed, Oct 9, 2013 at 1:05 PM, Vimal Shah <vimals at sokikom.com> wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> Does anyone have a step by step guide to getting monitoring (heap
>>>>>> stack) set up of a Java app on an Amazon VPC box? The application is
>>>>>> smartfoxserver and it's on Ubuntu 12.04.
>>>>>>
>>>>>> I've scratched the surface on the following:
>>>>>>
>>>>>>    - https://code.google.com/p/javamelody/
>>>>>>    -
>>>>>>    http://docs.oracle.com/javase/6/docs/technotes/guides/management/jconsole.html
>>>>>>    - http://jamonapi.sourceforge.net/
>>>>>>
>>>>>>
>>>>>> Application code changes aren't within my reach at the moment. An
>>>>>> apt-get install of a monitoring tool on the server under question would be
>>>>>> ideal. If this tool can have low overhead even better.
>>>>>>
>>>>>> Thank you all in advance.
>>>>>>
>>>>>> --
>>>>>> Vimal (rhymes with Kimmel) Shah
>>>>>> Front-End / Infrastructure Engineer
>>>>>> Sokikom
>>>>>> Mobile: (480) 752-9269
>>>>>> Email:   vimals at sokikom.com
>>>>>> Web:    www.sokikom.com
>>>>>>
>>>>>> Follow us: twitter.com/sokikom <http://www.twitter.com/sokikom>
>>>>>> Like us: facebook.com/sokikom <http://www.facebook.com/sokikom>
>>>>>>
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>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> James McPhee
>>>>> jmcphe at gmail.com
>>>>>
>>>>> ---------------------------------------------------
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>>>>> To subscribe, unsubscribe, or to change your mail settings:
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>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Vimal (rhymes with Kimmel) Shah
>>>> Front-End / Infrastructure Engineer
>>>> Sokikom
>>>> Mobile: (480) 752-9269
>>>> Email:   vimals at sokikom.com
>>>> Web:    www.sokikom.com
>>>>
>>>> Follow us: twitter.com/sokikom <http://www.twitter.com/sokikom>
>>>> Like us: facebook.com/sokikom <http://www.facebook.com/sokikom>
>>>>
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>>>>
>>>
>>>
>>>
>>> --
>>> James McPhee
>>> jmcphe at gmail.com
>>>
>>> ---------------------------------------------------
>>> PLUG-discuss mailing list - PLUG-discuss at lists.phxlinux.org
>>> To subscribe, unsubscribe, or to change your mail settings:
>>> http://lists.phxlinux.org/mailman/listinfo/plug-discuss
>>>
>>
>>
>>
>> --
>> Vimal (rhymes with Kimmel) Shah
>> Front-End / Infrastructure Engineer
>> Sokikom
>> Mobile: (480) 752-9269
>> Email:   vimals at sokikom.com
>> Web:    www.sokikom.com
>>
>> Follow us: twitter.com/sokikom <http://www.twitter.com/sokikom>
>> Like us: facebook.com/sokikom <http://www.facebook.com/sokikom>
>>
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>> To subscribe, unsubscribe, or to change your mail settings:
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>>
>
>
>
> --
> James McPhee
> jmcphe at gmail.com
>
> ---------------------------------------------------
> PLUG-discuss mailing list - PLUG-discuss at lists.phxlinux.org
> To subscribe, unsubscribe, or to change your mail settings:
> http://lists.phxlinux.org/mailman/listinfo/plug-discuss
>



-- 
Vimal (rhymes with Kimmel) Shah
Front-End / Infrastructure Engineer
Sokikom
Mobile: (480) 752-9269
Email:   vimals at sokikom.com
Web:    www.sokikom.com

Follow us: twitter.com/sokikom <http://www.twitter.com/sokikom>
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