Page created: 6 Nov 2019 |
Page updated: 25 Mar 2020
If you set the Preload Database at startup option during the
installation, then skip to step 3. If you are not sure, retrieve the
prime-methodproperty for the backend as follows:
$ bin/dsconfig get-backend-prop --backend-name userRoot \ --property prime-method
prime-methodproperty was not configured, use bin/dsconfig to set the property to PRELOAD, and then, restart the Directory Server to preload the database cache.
$ bin/dsconfig set-backend-prop --backend-name userRoot \ --set prime-method:preload $ bin/stop-server $ bin/start-server
At startup, you will see an administrative message if the current
CMSInitiatingOccupancyFractionproperty is below the recommended value. You can get the recommended value from this message and change it in the config/java.properties file in step 5.
If you were unable to see the recommended
CMSInitiatingOccupancyFractionproperty at startup presented in the previous step, first you must pre-tune the value of the
CMSInitiatingOccupancyFractionproperty to ensure that all of the data is imported into the server and preloading is enabled in the backend. Next, retrieve the recommended
CMSInitiatingOccupancyFractionvalue by issuing the following search. If the
recommended-cms-initiating-occupancy-fraction-for-current-data-setis not present, then make sure that the server has been restarted since enabling preload for the backend(s).
$ bin/ldapsearch --baseDN "cn=monitor" \ "(objectclass=ds-memory-usage-monitor-entry)" \ cms-initiating-occupancy-fraction \ recommended-cms-initiating-occupancy-fraction-for-current-data-set
dn: cn=JVM Memory Usage,cn=monitor cms-initiating-occupancy-fraction:80 recommended-cms-initiating-occupancy-fraction-for-current-data-set:55
Open the config/java.properties file using a text editor,
manually edit the
CMSInitiatingOccupancyFractionor any other property to its recommended value in the
start-server.java-argsproperty, and then, save the file when finished. (The following arguments are recommended for a Sun 5440 server. Contact your authorized support provider for specific assistance.):
start-server.java-args=-d64 -server -Xmx20g -Xms20g -XX:MaxNewSize=1g -XX:NewSize=1g -XXParallelGCThreads=16 -XX:+UseConcMarkSweepGC -XX:+CMSConcurrentMTEnabled -XX:+CMSParallelRemarkEnabled -XX:+CMSParallelSurvivorRemarkEnabled -XX:ParallelCMSThreads=8 -XX:CMSMaxAbortablePrecleanTime=3600000 -XX:+CMSScavengeBeforeRemark -XX:RefDiscoveryPolicy=1 -XX:CMSInitiatingOccupancyFraction=55 -XX:+UseParNewGC -XX:+UseBiasedLocking -XX:+UseLargePages -XX:+HeapDumpOnOutOfMemoryErrorThe
-XX:ParallelGCThreadsshould be limited to 16 (default) or to 8 for smaller systems. Also, the
-XX:ParallelCMSThreadsshould be limited to 8.
Run the bin/dsjavaproperties command to apply the
- Restart the Directory Server.