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Stop-and-copy garbage collection in a Lisp architecture: [1] Memory is divided into working and free memory; new objects are allocated in the former. When it is full (depicted), garbage collection is performed: All data structures still in use are located by pointer tracing and copied into consecutive locations in free memory.
Garbage-first (G1) collector is a server-style garbage collector, targeted for multiprocessors with large memories, that meets a soft real-time goal with high probability, while achieving high-throughput. [2] G1 preferentially collects regions with the least amount of live data, or "garbage first". [3] G1 is the long term replacement of CMS.
Many modern programming languages such as Java and Haskell provide automated garbage collection. However, it is not a recent development, as it has also been used in older languages such as LISP . There is ongoing research to type-theoretic approaches (such as region inference ) to identification and removal of garbage from a program.
The concurrent mark sweep collector (concurrent mark-sweep collector, concurrent collector or CMS) [1] was a mark-and-sweep garbage collector in the Oracle HotSpot Java virtual machine (JVM) available since version 1.4.1. It was deprecated on version 9 [2] and removed on version 14, [3] so from Java 15 it is no longer available. [4] [5]
In computer science, a mark–compact algorithm is a type of garbage collection algorithm used to reclaim unreachable memory. Mark–compact algorithms can be regarded as a combination of the mark–sweep algorithm and Cheney's copying algorithm. First, reachable objects are marked, then a compacting step relocates the reachable (marked ...
In computer science, region-based memory management is a type of memory management in which each allocated object is assigned to a region.A region, also called a partition, subpool, zone, arena, area, or memory context, is a collection of allocated objects that can be efficiently reallocated or deallocated all at once.
Under tracing garbage collection, the request to allocate a new object can sometimes return quickly and at other times trigger a lengthy garbage collection cycle. Under reference counting, whereas allocation of objects is usually fast, decrementing a reference is nondeterministic, since a reference may reach zero, triggering recursion to ...
The 1.0 and 1.1 Java virtual machines (JVMs) used a mark-sweep collector, which could fragment the heap after a garbage collection. Starting with Java 1.2, the JVMs changed to a generational collector, which has a much better defragmentation behaviour. [13] Modern JVMs use a variety of methods that have further improved garbage collection ...