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Major GC should be minimized because it will make your application unresponsive for the garbage collection duration.So if you have a responsive application and there are a lot of Major Garbage Collection happening, you will notice timeout errors.If you want to use the same application, go to Java SE Downloads page and download JDK 7 and Java FX Demos and Samples.The sample application I am using is Java2and it’s present in [email protected]:~$ ps -eaf | grep Java2501 9582 11579 0 PM ttys000 .66 /usr/bin/java -Xmx120m -Xms30m -Xmn10m -XX: Perm Size=20m -XX: Max Perm Size=20m -XX: Use G1GC -jar Java2501 14073 14045 0 PM ttys002 .00 grep [email protected]:~$ jstat -gc 9582 1000 S0C S1C S0U S1U EC EU OC OU PC PU YGC YGCT FGC FGCT GCT 1024.0 1024.0 0.0 0.0 8192.0 7933.3 42108.0 23401.3 20480.0 19990.9 157 0.274 40 1.381 1.654 1024.0 1024.0 0.0 0.0 8192.0 8026.5 42108.0 23401.3 20480.0 19990.9 157 0.274 40 1.381 1.654 1024.0 1024.0 0.0 0.0 8192.0 8030.0 42108.0 23401.3 20480.0 19990.9 157 0.274 40 1.381 1.654 1024.0 1024.0 0.0 0.0 8192.0 8122.2 42108.0 23401.3 20480.0 19990.9 157 0.274 40 1.381 1.654 1024.0 1024.0 0.0 0.0 8192.0 8171.2 42108.0 23401.3 20480.0 19990.9 157 0.274 40 1.381 1.654 1024.0 1024.0 48.7 0.0 8192.0 106.7 42108.0 23401.3 20480.0 19990.9 158 0.275 40 1.381 1.656 1024.0 1024.0 48.7 0.0 8192.0 145.8 42108.0 23401.3 20480.0 19990.9 158 0.275 40 1.381 1.656 and check how it’s performing with CMS Garbage collector.Memory Pools are created by JVM memory managers to create a pool of immutable objects, if implementation supports it.String Pool is a good example of this kind of memory pool.Perm Gen is populated by JVM at runtime based on the classes used by the application.

When young generation is filled, garbage collection is performed. Young Generation is divided into three parts – Eden Memory and two Survivor Memory spaces.Old Generation Garbage Collection is called Major GC and usually takes longer time.All the Garbage Collections are “Stop the World” events because all application threads are stopped until the operation completes.The duration taken by garbage collector depends on the strategy used for garbage collection.That’s why it’s necessary to monitor and tune the garbage collector to avoid timeouts in the highly responsive applications.

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