الأجيال وجذور GC وقابلية الوصول

في هذا الدرس

explain how the GC decides what is garbage.

الموضوعات المخطط لها

• An object is live if reachable from a GC root: thread stacks, static fields, JNI references.
• Weak generational hypothesis: most objects die young, so collect the young generation often and cheaply.
• Survivors are copied between survivor spaces; after enough collections they are promoted to old.
• Old generation is collected less often; a leak shows up as old-gen growth.
• Unreachable cycles are collected; reference counting is not used.