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From Luciano Andress Martini <777u...@gmail.com>
Subject Re: Java.lang.out.of.memory not clearly....
Date Mon, 30 Jan 2012 15:40:19 GMT
Do you know how to solve this memory leak, its a hardware problem?


2012/1/30, Jeffrey Janner <Jeffrey.Janner@polydyne.com>:
> See below....
>
>> -----Original Message-----
>> From: Pid [mailto:pid@pidster.com]
>> Sent: Friday, January 27, 2012 2:41 PM
>> To: Tomcat Users List
>> Subject: Re: Java.lang.out.of.memory not clearly....
>>
>> On 27/01/2012 18:39, Luciano Andress Martini wrote:
>> > i dont know how to increase the heap space is using the parameter -
>> Xmx?
>> >
>> >
>> > 2012/1/27, Pid <pid@pidster.com>:
>> >> On 27/01/2012 17:54, Luciano Andress Martini wrote:
>> >>> -Xmx512m -Xmx1024 ?
>> >>
>> >> Please post your replies below the questions I asked.
>> >>
>> >> Someone reading this thread would see the first bit of this message
>> >> and wonder what it referred to.
>> >>
>> >>
>> >> p
>> >>
>> >>> 2012/1/27, Luciano Andress Martini <777user@gmail.com>:
>> >>>> its 64 bits? How can i increase the object heap?
>> >>>>
>> >>>>
>> >>>>
>> >>>> 2012/1/27, Pid <pid@pidster.com>:
>> >>>>> On 27/01/2012 16:29, Luciano Andress Martini wrote:
>> >>>>>> I need to know if the error is from my part (server
>> >>>>>> administrator), from the developer or from the hardware/vms.
>> Some
>> >>>>>> times that occurs when processing two milion of registry
(i am
>> >>>>>> talking from expressocard a company of credit cards).
>> >>>>>>
>> >>>>>> Its a rarely error because this processing occurs rarely.
>> >>>>>>
>> >>>>>> in fact, mysql in the another server with 12 processors,
still
>> >>>>>> running, and tomcat in a virtual machine called adm (in
another
>> >>>>>> physical machine, with 4 processors) still running.
>> >>>>>>
>> >>>>>> So, this errors occurs like that:
>> >>>>>>
>> >>>>>> 1- Tomcat started
>> >>>>>> 2- This processing is realized ok in the first time
>> >>>>>> 3- Tomcat stable in the users acess.
>> >>>>>> 4- The processing is realized again, some days later, inn
98% of
>> >>>>>> processing servers crashes, but mysql is still running.
>> >>>>>> 5- Restar of tomcat service tomcat6 restart
>> >>>>>> 6- the processing started again, and server can done the
>> processing.
>> >>>>>>
>> >>>>>> In the moment of the crash:
>> >>>>>> jstat -class
>> >>>>>> Loaded  Bytes  Unloaded  Bytes     Time
>> >>>>>>
>> >>>>>>  15007 32265.0      300   505.9      12.11
>> >>>>>
>> >>>>> So permgen is using 32Mb
>> >>>>>
>> >>>>>> Java using: 914mb
>> >>>>>> Free memory on the virtual machine server: 2152
>> >>>>>>
>> >>>>>> Java says:
>> >>>>>> java.util.concurrent.ExecutionException:
>> java.lang.OutOfMemoryError:
> [.....]
>> >>>>>> java.lang.OutOfMemoryError: Java heap space
>> >>>>>>
>> >>>>>> Java options (that i configurate) -Djava.awt.headless=true
>> >>>>>> -Xmx512m -XX:MaxPermSize=3512M
>> >>>>>
>> >>>>> Cripes!  3.5Gb of PermGen space?!  I really doubt you want that.
>> >>>>>
>> >>>>> So your JVM is using 900Mb, your object heap is 512Mb.
>> >>>>>
>> >>>>> If you have more memory available, why not assign more to the
>> heap?
>> >>>>> How much memory is available?
>> >>>>>
>> >>>>> Are you using 32bit or 64bit?
>> >>>>>
>> >>>>>
>> >>>>> p
>> >>>>>
>> >>>>>> -XX:+CMSIncrementalMode
>> >>>>>> -XX:+UseConcMarkSweepGC
>> >>>>>> -XX:+CMSClassUnloadingEnabled
>> >>>>>> -XX:ParallelGCThreads=4
>> >>>>>> -XX:+UseParNewGC
>> >>>>>>
>> >>>>>> ----------------------------------------------------------------
>>
>> (What part of 'below' wasn't clear to you?)
>>
>>
>> You are setting -XX:MaxPermSize=3512M - it's too high.
>>
>> 'jmap -heap' will tell you how much PermGen you're actually using, try
>> setting -XX:MaxPermSize=64M or whatever is appropriate.
>>
>> You still haven't said how much RAM you actually have available, so I
>> will assume you have 1 Tomcat running on a server with 4Gb of RAM.
>>
>> You can set -Xmx=1024M to set the heap size to 1Gb.
>>
>>
>> p
>>
>
> However, if I read Luciano's initial problem report correctly, it's quite
> likely he'll still see the same problem but a few days later. I will try to
> paraphrase his description:
>
> 1) He processes a large batch of transactions -- all OK
> 2) Other work gets done by Tomcat
> 3) A few days later, he processes another large batch of transactions, but
> gets OOM.
> 4) He restarts Tomcat and it processes the second batch just fine, but fails
> on next load.
>
> That sounds to me like your standard memory leak, most likely in his
> application.
> Doubling the memory will certainly help, but most likely will only delay the
> issue. I expect that his Tomcat will probably see another OOM sometime
> between the 3rd and 5th processing cycles.
>
> Luciano, I would not call this resolved unless you do not see the OOM again
> within another 12 or so batch runs.  It could be that your original heap
> size was just too small to accommodate your load, and was only noticeable
> with other work being done when the big job came along.  Or it could be you
> have a memory leak in this, or another, process.
>
> Jeff
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