What is Garbage First Collector?

Question

JVM provides garbage collector. Can we do in C ? And what are the efficient ways to implement it in C lang ?

Answer 1

As we know we can not force JVM for Garbage Collection , but Java7 introduced Garbage First Collector is this new technique much powerful and resolve the issue of Memory leak sometime in application.

The first focus of G1 is to provide a solution for users running applications that require large heaps with limited GC latency. This means heap sizes of around 6GB or larger, and stable and predictable pause time below 0.5 seconds.

Applications running today with either the CMS or the ParallelOld garbage collector would benefit switching to G1 if the application has one or more of the following traits.

More than 50% of the Java heap is occupied with live data. The rate of object allocation rate or promotion varies significantly. Undesired long garbage collection or compaction pauses (longer than 0.5 to 1 second)

Answer 2

The collector splits the heap up into fixed-size regions and tracks the live data in those regions. It keeps a set of pointers — the "remembered set" — into and out of the region. When a GC is deemed necessary, it collects the regions with less live data first (hence, "garbage first")