java

Use the JVM options -XX:+TraceClassloading and -XX:+TraceClassUnloading to see what classes are loaded/un-loaded in real-time. If you have doubts about excessive class loading in your app; this might help you find out exactly what classes are loaded and where. Use -XX:+UseParallelGC to tell the JVM to use multi-threaded, one thread per CPU, garbage collection. This might improve GC performance since the default garbage collector is single-threaded. Define the number of GC threads to use with the -XX:ParallelGCThreads={no of threads} option Never call System.gc(). The application doesn't know the best time to garbage-collect, only the JVM really does. The JVM option -XX:+AggressiveHeap inspects the machine resources (size of memory and number of processors) and attempts to set various heap and memory parameters to be optimal for long-running, memory allocation-intensive jobs.