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POOut of memory with tomcat 6 on RedHat but not in debian
 

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    <p>I am using liferay 6.0.6 with tomcat 6 and using terracotta 3.5.4. The terracotta installation in on another server and works fine.</p> <p>The debian and redhat systems are virtual machines and use the exact same virtual hardware. 1 cpu , 4gb ram, both 64bit OS.</p> <pre><code>java version "1.6.0_24" OpenJDK Runtime Environment (IcedTea6 1.11.3) (rhel-1.48.1.11.3.el6_2-x86_64) OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode) </code></pre> <p>If im using a debian system and boot the application then it everything works as expected.</p> <p>If im using the redhat system then i get an error :</p> <pre><code>java.lang.OutOfMemoryError: unable to create new native thread at java.lang.Thread.start0(Native Method) at java.lang.Thread.start(Thread.java:657) at java.util.Timer.&lt;init&gt;(Timer.java:176) at com.tc.object.locks.ClientLockManagerImpl.&lt;init&gt;(ClientLockManagerImpl.java:39) at com.tc.object.StandardDSOClientBuilder.createLockManager(StandardDSOClientBuilder.java:190) at com.tc.object.DistributedObjectClient.start(DistributedObjectClient.java:639) at com.tc.object.bytecode.ManagerImpl$2.execute(ManagerImpl.java:263) at com.tc.lang.StartupHelper.startUp(StartupHelper.java:39) at com.tc.object.bytecode.ManagerImpl.startClient(ManagerImpl.java:281) at com.tc.object.bytecode.ManagerImpl.init(ManagerImpl.java:202) at com.tc.object.bytecode.ManagerImpl.init(ManagerImpl.java:190) at com.tc.object.bytecode.hook.impl.DSOContextImpl.createStandaloneContext(DSOContextImpl.java:179) at org.terracotta.express.StandaloneL1Boot.call(StandaloneL1Boot.java:190) at org.terracotta.express.ClientImpl.&lt;init&gt;(ClientImpl.java:309) at org.terracotta.express.ClientFactoryImpl.newClient(ClientFactoryImpl.java:232) at org.terracotta.express.ClientFactoryImpl.createClient(ClientFactoryImpl.java:225) at org.terracotta.express.ClientFactoryImpl.createClient(ClientFactoryImpl.java:212) at org.terracotta.express.ClientFactoryImpl.getOrCreateClient(ClientFactoryImpl.java:190) at org.terracotta.express.ClientFactory.getOrCreateClient(ClientFactory.java:28) at net.sf.ehcache.terracotta.StandaloneTerracottaClusteredInstanceFactory.&lt;init&gt;(StandaloneTerracottaClusteredInstanceFactory.java:37) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) </code></pre> <p>The weirdest part of this error is that memory is not used. I have set the Xmx at 3500m but the memory usage never climbs above 2.3gb.</p> <p>I've been searching for a possible cause and found this : <a href="https://stackoverflow.com/questions/116640/low-java-single-process-thread-limit-in-red-hat-linux">Low Java single process thread limit in Red Hat Linux</a></p> <p>So i changed my ulimit -n and ulimit -u to 80000 but still nothing changes.</p> <p>I then edited my /etc/security/limits.conf</p> <pre><code>* soft nproc 81920 * hard nproc 81920 * soft nofile 81920 * hard nofile 81920 </code></pre> <p>I also edited /etc/sysctl.conf</p> <pre><code>fs.file-max = 100000 </code></pre> <p>then i rebooted.</p> <p>I also added -Xms=2g to my setenv.sh</p> <p>I increased -Xss to -Xss5000k</p> <p>I run echo 200000 > /proc/sys/kernel/threads-max</p> <p>But the same error still comes up. Any ideas ?</p> <p>free -m at begining of booting</p> <pre><code> total used free shared buffers cached Mem: 3963 1027 2935 0 25 748 -/+ buffers/cache: 253 3709 Swap: 2047 18 2029 </code></pre> <p>free -m just before crash</p> <pre><code> total used free shared buffers cached Mem: 3963 2897 1065 0 31 823 -/+ buffers/cache: 2043 1920 Swap: 2047 18 2029 </code></pre> <p>Update : i also tried with a machine with 8gb ram and the same result appears.</p>
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