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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.
Lisp introduced the concept of automatic garbage collection, in which the system walks the heap looking for unused memory. Progress in modern sophisticated garbage collection algorithms such as generational garbage collection was stimulated by its use in Lisp. [64] Edsger W. Dijkstra in his 1972 Turing Award lecture said,
NEG se CL puede can. 1SG pisar walk el the césped grass No se puede pisar el césped NEG CL can.1SG walk the grass "You cannot walk on the grass." Zagona also notes that, generally, oblique phrases do not allow for a double clitic, yet some verbs of motion are formed with double clitics: María María se CL fue went.away- 3SG María se fue María CL went.away-3SG "Maria went away ...
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.
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 terms of latency, simple stop-the-world garbage collectors pause program execution for garbage collection, which can happen at arbitrary times and take arbitrarily long, making them unusable for real-time computing, notably embedded systems, and a poor fit for interactive use, or any other situation where low latency is a priority. However ...
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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]