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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.
For work based analysis, MMU (minimal mutator utilization) [9] is usually used as a real-time constraint for the garbage collection algorithm. One of the first implementations of hard real-time garbage collection for the JVM was based on the Metronome algorithm, [10] whose commercial implementation is available as part of the IBM WebSphere Real ...
Garbage collection is performed by copying live objects from one semispace (the from-space) to the other (the to-space), which then becomes the new heap. The entire old heap is then discarded in one piece. It is an improvement on the previous stop-and-copy technique. [citation needed] Cheney's algorithm reclaims items as follows:
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 ...
Garbage collection uses various algorithms to automatically analyze the state of a program, identify garbage, and deallocate it without intervention by the programmer. Many modern programming languages such as Java and Haskell provide automated garbage collection.
Then the free pages left by not moving the stale data are available for new data. This is a process called garbage collection (GC). [1] [11] All SSDs include some level of garbage collection, but they may differ in when and how fast they perform the process. [11] Garbage collection is a big part of write amplification on the SSD. [1] [11]
Tracing garbage collection cycles are triggered too often if the set of live objects fills most of the available memory; [citation needed] it requires extra space to be efficient. [citation needed] Reference counting performance does not deteriorate as the total amount of free space decreases. [2]
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.