Is Concurrent Mark Sweep (CMS) a stop the world event?
I see many unloading of classes and my entire system will hang during that period of time.. [Unloading class sun.reflect.GeneratedMethodAccessor117] [Unloading class sun.reflect.GeneratedConstructorAccessor1896] [Unloading class sun.reflect.GeneratedSerializationConstructorAccessor485] [Unloading class sun.reflect.GeneratedSerializationConstructorAccessor579] .... // about 1700 of them at the same time I do not see a spike in perm space, so it doesn't seems to be a GC event. I wish to know the following IS Concurrent Mark Sweep collection a stop the world event? Does it happen even when the