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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 50070] New: memory leak using NIO connector
Date Sun, 10 Oct 2010 18:47:36 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=50070

           Summary: memory leak using NIO connector
           Product: Tomcat 6
           Version: 6.0.29
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: Catalina
        AssignedTo: dev@tomcat.apache.org
        ReportedBy: reemhal@hotmail.com


Hi

I am using tomcat 6.0.29 with a HTTP NIO connector (Http11NioProtocol) under
load tests.
Seems like I have a memory leak origin from the NIO Http connector ,since when
changing back to the regular HTTP connector - all is working fine.
I am using the jstat command to monitor the JVM's old generation pool - seems
like no matter how big it is (and I reached 1.5GB ) , it just get growing as
the load increase on the server (see class dump bellow ) .
Another important point is that this leak start happening only when I ported my
code to Linux OS from Solaris OS (Solaris 10).
I am using java 6 ( java version "1.6.0_13" )
And my JVM parameters are : 
/usr/mms/java/bin/java -server -Xss256k -Xms3000m -Xmx3000m -Xmn1512m
-XX:ParallelGCThreads=4 -XX:+UseConcMarkSweepGC -XX:+UseParNewGC
-XX:SurvivorRatio=4

I am attaching the jmap dump + my JVM parameters :

   1:      17932169      573829408 
java.util.concurrent.ConcurrentLinkedQueue$Node
   2:         87512      431355368  [B
   3:       1255621      247535088  [C
   4:       2736358      131345184 
java.util.concurrent.locks.ReentrantLock$NonfairSync
   5:       2736178      131336544 
java.util.concurrent.ConcurrentHashMap$Segment
   6:       3422985      109535520 
java.util.concurrent.LinkedBlockingQueue$Node
   7:       2736244       91386840 
[Ljava.util.concurrent.ConcurrentHashMap$HashEntry;
   8:        185050       55436224  [I
   9:        716357       34385136  java.util.HashMap$Entry
  10:        833420       33336800  java.lang.String
  11:        827980       33119200  com.comverse.mms.util.ByReference
  12:        248473       26073344  [Ljava.lang.Object;
  13:        171013       25993736 
[Ljava.util.concurrent.ConcurrentHashMap$Segment;
  14:        170972       23252192  org.apache.catalina.session.StandardSession
  15:        106757       20898400  [Ljava.util.HashMap$Entry;
  16:        175378       20185544  [Ljava.util.Hashtable$Entry;
  17:        171013       12312936  java.util.concurrent.ConcurrentHashMap
  18:         77208       11834128  <constMethodKlass>
  19:        174716       11181824  java.util.Hashtable
  20:         77208        9277616  <methodKlass>
  21:          7593        9266200  <constantPoolKlass>
  22:        188955        9069840 
java.util.concurrent.ConcurrentHashMap$HashEntry
  23:        213533        8541320  java.util.ArrayList
  24:        171012        8208576  java.beans.PropertyChangeSupport
  25:        137289        7071968  <symbolKlass>
  26:        103736        6639104  java.util.HashMap
  27:          7593        5855112  <instanceKlassKlass>
  28:          6332        5520192  <constantPoolCacheKlass>
  29:         61325        5396600 
com.comverse.mms.dispatcher.executors.ComponentExecutor
  30:        153840        4922880  java.lang.StringBuilder
  31:        170419        4090056 
org.apache.catalina.session.StandardSessionFacade
  32:          5836        3813664  <methodDataKlass>
  33:         19859        3410688  [Z
  34:         37362        2416176  [Ljava.lang.String;
  35:         44119        2117712  java.util.Hashtable$Entry
  36:         65056        2081792  java.lang.StringBuffer
  37:         45353        1814120  java.util.AbstractList$Itr
  38:         73621        1766904 
com.comverse.mms.dispatcher.parameters.ControlParameters
  39:         53961        1726752 
com.comverse.mms.dispatcher.parameters.ParametersValidator
  40:         52474        1679168 
com.comverse.mms.dispatcher.parameters.ControlParametersWrapper
  41:         10058        1528816  java.lang.reflect.Method
  42:          8152        1499968  java.lang.Class
  43:         12775        1338384  [S
  44:         33200        1328000  java.util.LinkedList$Entry
  45:         22524        1261344  java.util.HashMap$KeyIterator
  46:         11232        1168128  [Ljava.util.regex.Pattern$GroupHead

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