Issue is Non Paged pool of tomcat increases until the OS crashes On Tue, Nov 29, 2011 at 9:52 AM, Pid * <p...@pidster.com> wrote:
> On 28 Nov 2011, at 18:09, Doron Tsur <qbal...@gmail.com> wrote: > > > Hi All > > > > I've been having an issue in one of our production servers. The Non Paged > > Pool creeps up slowly until the system hangs and than crash. > > > > Tomcat: 6.0.16 > > So the latest release is 6.0.33. Yours is over 3 years old. > > > Java: 1.5.16 > > Java 5 is no longer supported, and your version is old, even so. > > > OS: Windows Server 2003 R2 SP2 > > > > This is a production server that uses high bandwidth. Poking around > > Poolmon.exe I was able to find that > > > > 1. the AfdP tag is consuming a lot of NP (Non Paged) pool. > > 2. This is a tag concerning the windows socket driver (afd.sys). > > 3. I have seen an Microsoft hotfix which seems to be related to this > issue > > http://support.microsoft.com/kb/931311 . The only issue is that the > afd.sys > > file mention in the hotfix is from a previous version from the one > > installed. 5.2.3790.4008 vs 5.2.3790.4898 > > ... right. > > > > We have many production server running our tomcat. We have only > encountered > > this issue in two of them, those servers have the same OS/Java/Tomcat > > installed. One server uses high bandwidth and the other uses much less. > > > > Here I am mumbling about Microsoft and win socket what do I want from you > > guys? > > Good question. > > > As far as I understand the issue is can happen in 3 areas. The java part > > interfacing with the driver, the driver it's self and the network card > > interfacing with the driver. I say tomcat because this is the process > that > > consumes all NP pool (about 170MB). I would like to explore with you > guys > > the Tomcat to winsock option > > > > 1. Have you ever encountered this issue? > > Which issue, exactly? > > > 2. Do you know of any application level/Tomcat configuration work around > to > > solve this issue? > > 3. Do you think that there is something wrong in the way Tomcat > interfaces > > with winsock? > > Tomcat doesn't. Java does. > > > 4. Do you believe that Tomcat APR might resolve this issue? > > Not sure I understand what the issue is. > > > Any tip or information about this issue will be highly appreciated, I've > > scattered the web and banging my head over this issue for a long time. > > How are you starting Tomcat, e.g. using the service wrapper? > > Enable JMX (there's notes on tomcat.apache.org) and use JConsole to > observe memory usage inside the JVM. > > If any of the JVM memory areas shows that it's consuming more memory, > the app has a memory leak. > > If not, you have confirmed that the issue is outside Java. > > > p > > > > Good Day, > > qballer > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > >
