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From Daniel Mikusa <dmik...@vmware.com>
Subject Re: Java process killed by oom-killer in Ubuntu
Date Thu, 07 Jun 2012 19:07:54 GMT
----- Original Message -----
> 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. 

How many threads have you observed?  Total threads, not just threads for the connector.

Also, what is the value you are using for thread stack size?  -Xss

Dan



(but it could be that the burst is too fast to get catch by
> the monitoring tool)
> 
> -Jorge
> 
> 
> 
> 
> 
> 
> 
> On Thu, Jun 7, 2012 at 11:44 AM, Christopher Schultz
> <chris@christopherschultz.net> wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > 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
> > -----BEGIN PGP SIGNATURE-----
> > Version: GnuPG/MacGPG2 v2.0.17 (Darwin)
> > Comment: GPGTools - http://gpgtools.org
> > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
> >
> > iEYEARECAAYFAk/Q9ooACgkQ9CaO5/Lv0PDPyQCfVtddxMDOgQbjmMGC3gvnK+Qq
> > aZMAnjVu67+9Sm2bdYzAd91ZOrYo3DFI
> > =r+vl
> > -----END PGP SIGNATURE-----
> >
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