seniorRuby

Analyze Ruby's Garbage Collection mechanism, specifically Generational and Incremental GC.

Updated May 17, 2026

Short answer

Ruby uses a tri-color, generational, and incremental mark-and-sweep garbage collector that minimizes stop-the-world pauses by dividing objects into young and old generations.

Deep explanation

Ruby's GC relies on a Mark-and-Sweep strategy. To optimize performance, Ruby 2.1 introduced Generational GC (RGenGC), dividing the object space into 'young' and 'old' generations based on survival tenure. Most objects die young; hence, Minor GCs only scan the young generation, drastically cutting down processing times. If an object survives multiple sweeps, it is promoted to the old generation, which is only checked during Major GCs.…

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