Hybrid Memory Management
summary
A Substrate-style VM implements region-based allocation atop an AOT compiler and simple runtime: methods mark region entry/exit, per-thread region buffers allocate into fixed-size region chunks with per-thread buffers, and a fallback full GC runs rarely. Static closed-world AOT analysis identifies temporaries so many objects bypass GC; in benchmarks a transaction workload that allocates ~56 GB sees 75% of memory never seen by GC, cutting GC time substantially. Region exit cost and conservative handling of Java finalizers remain the main limits.
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chapters (6)
- 0:00Start
- 0:41Truffle System Structure
- 4:42Microbenchmark for Startup and Peak Performance (2)
- 10:24Region-Based Memory Management
- 14:36Region Analysis
- 29:39Execution and GC time, varying young generation size
