On 03/05/2012 15:59, Christopher Schultz wrote: > Miguel, > > On 5/3/12 10:28 AM, Miguel González Castaños wrote: >> On 03/05/2012 15:29, Pid wrote: >>> On 03/05/2012 11:35, Miguel González Castaños wrote: >>>> Dear all, >>>> >>>> My Tomcat 5.5 server reports in catalina.out under heavy load >>>> that Tomcat is pausing. I checked and no java process was >>>> running and I had to start Tomcat manually. >>> Can you post an example of the message from catalina.out that >>> says Tomcat is pausing? >> May 3, 2012 8:40:10 AM org.apache.catalina.storeconfig.StoreLoader >> load INFO: Find registry server-registry.xml at classpath resource >> May 3, 2012 8:40:10 AM org.apache.catalina.startup.Catalina start >> INFO: Server startup in 5771 ms May 3, 2012 9:56:54 AM >> org.apache.coyote.http11.Http11BaseProtocol pause INFO: Pausing >> Coyote HTTP/1.1 on http-80 May 3, 2012 9:56:54 AM >> org.apache.coyote.http11.Http11BaseProtocol pause INFO: Pausing >> Coyote HTTP/1.1 on http-443 May 3, 2012 1:35:03 PM >> org.apache.catalina.core.AprLifecycleListener lifecycleEvent INFO: >> The Apache Tomcat Native library which allows optimal performance >> in production environments was not found on the java.library.path: >> /usr/bin/jdk1.5.0_17/jre/lib/i386/server:/usr/bin/jdk1.5.0_17/jre/lib/i386:/usr/bin/jdk1.5.0_17/jre/../lib/i386 > >> May 3, 2012 1:35:03 PM org.apache.coyote.http11.Http11BaseProtocol >> init > >> I have just realized about that APR is missing, can be affecting to >> this issue? > > Unlikely. If you are using SSL or serving large static files, > APR/tcnative should be something that you look into using. > > Honestly, I would put more effort into upgrading to a more recent > version of Tomcat than looking into using APR/tcnative. > >>>> No errors before in catalina.out. The only error found today >>>> (It crashed 3 times in 3 hours) was an outofmemory error. >>>> >>>> I changed from 1024Mb to 1536Mb in catalina.sh: >>>> >>>> CATALINA_OPTS="$CATALINA_OPTS -Xms1536m -Xmx1536m" >>> Do you actually have 2Gb of free RAM to assign to the Tomcat >>> process? > >> Well, the machine has 4 Gb and only runs MySQL and Tomcat.
... and an operating system & some other system processes and services. You didn't actually answer the question. > I hope you have small indexes in MySQL :) Quite. >> I have installed javamelody an the thread count is around 120, >> reaching a max of 180. Memory usage grows very fast until Tomcat >> hangs. I suspect is an issue of the garbage collector and setting >> the heap memory too high. > > If you suspect that you have set the heap memory too high, why are you > increasing it? > > It really seems like you are just grasping at straws and trying > whatever technique comes to mind at the time. Stop. Instrument your > webapp. Take data. When you have something substantive, draw a > conclusion and confirm it. Only then should you take corrective > action. Right now, you are changing all sorts of things and you'll > never know what was the one thing that worked because you've changed > everything. > >> I have reset it to 768 Mb and now the memory seems to keep quite >> low, some people say that Tomcat 5.x doesn't like much more than 1 >> Gb of heap memory and that GC is not doing his job: Utter nonsense. >> http://serverfault.com/questions/281515/periodic-unresponsiveness-in-tomcat > > Malarkey. +1 > Tomcat 5.5 doesn't really care what heap size it's got as > long as it's more than 4MiB or so. The page you referenced in here > doesn't even mention Tomcat 5.5. > > Usually the GC does do its job properly, and that includes pausing the > whole JVM in order to reclaim memory if necessary. The above thread > from ServerFault is about unresponsiveness, not about OOME: the GC > caused unresponsiveness to avoid OOME (and it worked). > > Stop making crazy claims and actually look at your own environment to > figure out what's going on. +1 p -- [key:62590808]
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