[jboss-user] [JBossCache] - High CPU usage in Weblogic 8.1

[ottuzzi]

Hi there,

I'm evaluating Treecache as cluster cache in our environment: we are running a weblogic8.1SP2 cluster deployed on Solaris 5.9 (aka Solaris 9) with SUN JDK 1.4.1_02.

Here is the configuration I'm using:
<?xml version="1.0" encoding="UTF-8"?>
  | <server>
  | 
  |     <classpath codebase="./lib" archives="jboss-cache.jar, jgroups.jar"/>
  | 
  | 
  |     <mbean code="org.jboss.cache.TreeCache"
  |            name="jboss.cache:service=TreeCache">
  | 
  |         <attribute name="IsolationLevel">REPEATABLE_READ</attribute>
  |         <attribute name="CacheMode">REPL_ASYNC</attribute>
  |         <attribute name="UseReplQueue">false</attribute>
  |         <attribute name="ReplQueueInterval">0</attribute>
  |         <attribute name="ReplQueueMaxElements">0</attribute>
  |         <attribute name="ClusterName">TreeCache-RA-Cluster</attribute>
  |              <attribute name="ClusterConfig">
  |                  <config>
  |                      <UDP mcast_addr="228.1.2.3" mcast_port="48866"
  |                           ip_ttl="64" ip_mcast="true"
  |                           mcast_send_buf_size="150000" mcast_recv_buf_size="80000"
  |                           ucast_send_buf_size="150000" ucast_recv_buf_size="80000"
  |                           loopback="false"/>
  |                      <PING timeout="2000" num_initial_members="3"
  |                            up_thread="false" down_thread="false"/>
  |                      <MERGE2 min_interval="10000" max_interval="20000"/>
  |                      <FD_SOCK/>
  |                      <VERIFY_SUSPECT timeout="1500"
  |                                      up_thread="false" down_thread="false"/>
  |                      <pbcast.NAKACK gc_lag="50" retransmit_timeout="600,1200,2400,4800"
  |                                     max_xmit_size="8192" up_thread="false" down_thread="false"/>
  |                      <UNICAST timeout="600,1200,2400" down_thread="false"/>
  |                      <pbcast.STABLE desired_avg_gossip="20000"
  |                                     up_thread="false" down_thread="false"/>
  |                      <pbcast.GMS join_timeout="5000" join_retry_timeout="2000"
  |                                  shun="true" print_local_addr="true"/>
  |                      <FC max_credits="2000000" down_thread="false" up_thread="false"
  |                          min_threshold="0.20"/>
  |                      <FRAG frag_size="8192" down_thread="false" up_thread="true"/>
  |                      <pbcast.STATE_TRANSFER up_thread="true" down_thread="true"/>
  |                  </config>
  |              </attribute>
  | 
  |              <attribute name="FetchInMemoryState">true</attribute>
  |              <attribute name="InitialStateRetrievalTimeout">20000</attribute>
  |              <attribute name="SyncReplTimeout">20000</attribute>
  |              <attribute name="LockAcquisitionTimeout">15000</attribute>
  |              <attribute name="EvictionPolicyClass">org.jboss.cache.eviction.LRUPolicy</attribute>
  |              <attribute name="EvictionPolicyConfig">
  |                  <config>
  |                      <attribute name="wakeUpIntervalSeconds">30</attribute><!-- 30 SECONDS -->
  |                      <!-- Cache wide default -->
  |                      <region name="/_default_">
  |                          <attribute name="maxNodes">10000</attribute>
  |                          <attribute name="timeToLiveSeconds">1800</attribute><!-- 30 MINUTES -->
  |                          <attribute name="maxAgeSeconds">1800</attribute><!-- 30 MINUTES -->
  |                      </region>
  |                      <region name="/USER/">
  |                          <attribute name="maxNodes">1000</attribute>
  |                          <attribute name="timeToLiveSeconds">900</attribute><!-- 15 MINUTES -->
  |                          <attribute name="maxAgeSeconds">900</attribute><!-- 15 MINUTES -->
  |                      </region>
  |                  </config>
  |              </attribute>
  |              <attribute name="UseRegionBasedMarshalling">true</attribute>
  | 
  |          </mbean>
  | 
  |      </server>

During tests I see a very HIGH CPU usage caused by TreeCache: without cache I see a CPU usage of about 10%, with TreeCache I can see even 20% CPU usage.
I made more tests to better understand the problem and I found that the simple cache initialization (I commented out all put/get/remove methods accessing Treecache and I simply initialized cache with the above XML) is enough to see the abnormal CPU usage: what is happening there?

Any help would be greatly appreciated.
Thanks
Bye
Piero

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