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) -Jorge On Thu, Jun 7, 2012 at 11:44 AM, Christopher Schultz <ch...@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----- > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
