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From Jorge Medina <>
Subject Re: Java process killed by oom-killer in Ubuntu
Date Thu, 07 Jun 2012 19:03:58 GMT
I am using MongoDB through the Java driver allowing up to 100
connections to the MongoDB server.
I also use DBCP with a max size of 50 JDBC connections.
My webapp uses about 150 JAR files.
There is no native libraries loaded from my webapp as far as I know.
All the app is pure Java code.  (Nevertheless, Tomcat is using the
Tomcat Native Library)

Is there a way I can monitor the number of file descriptors in use by the app?

I have monitored the number of threads, but I haven't seen anything
unusual. (but it could be that the burst is too fast to get catch by
the monitoring tool)


On Thu, Jun 7, 2012 at 11:44 AM, Christopher Schultz
<> wrote:
> Hash: SHA1
> Jorge,
> On 6/6/12 5:33 PM, Jorge Medina wrote:
>> The web application uses Spring/Postgres/Mongo.
> Are you using MongoDB in-process or anything weird like that? Or are
> you connecting through some socket-based (or other) API?
>> It looks like a memory leak in native code, not java code; so my
>> usual java toolset is not useful.
> If what you are observing is accurate (non-heap memory grows, heap
> stays reasonable) then it will definitely be more difficult to track-down.
>> Tomcat runs behind nginx in a EC2 instance. The application uses
>> Sun (now Oracle) JDK 1.6.
>> Any suggestions on what should I look at?
> What do your <Connectors> look like? How many JDBC connections do you
> have in your connection pool (which you are hopefully using!)? How
> about the same equivalent for MongoDB?
> Does your webapp keep lots of files open? Do you have an
> unusually-large number of JAR files in your webapp? Do you have any
> native libraries in use within your webapp?
> What are all the non-default system properties that you are setting at
> JVM launch time (you can easily see this from a 'ps' list)?
> Two things that can eat-up native memory fast in a JVM are file
> descriptors and threads, so let's start there.
> - -chris
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> =r+vl
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