could you please share your machine configuration[RAM and Processor]..Which DB you are using???
please check below points
1. check how much Memory left after starting server...
2. Tune JVM variable for heap size..
arbage Collector
Choosing the appropriate garbage collector will help improve the responsiveness of your Liferay Portal. Liferay Engineering
recommends using the concurrent low pause collectors, similar to the settings as follows*:
-XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XXemoticonarallelGCThreads=8 -
XX:+CMSCompactWhenClearAllSoftRefs -XX:CMSInitiatingOccupancyFraction=85
Other garbage collectors include a concurrent throughput collector. You may find more information on garbage collector
heuristics at http://java.sun.com/javase/technologies/hotspot/gc/gc_tuning_6.html.
Java Heap
When most people think about tuning the Java memory heap, they think of setting the maximum and minimum memory of the
heap. Unfortunately, you require far more sophisticated tuning for the heap to obtain optimal performance, including tuning
young generation size, tenuring durations, survivor spaces, and other JVM internals.
For the reference architecture, Liferay recommends adding something similar to the following to your VM parameters*:
-server -XX:NewSize=700m -XX:MaxNewSize=700m -Xms2048m -Xmx2048m -XX:MaxPermSize=128m -XX:SurvivorRatio=6 -
XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=15
You may find the definitive list of Sun JVM options are located at: http://blogs.sun.com/watt/resource/jvm-options-list.html.
