MMTk-tutorial

Description

MMTk TutorialSteve Blackburn ([e-mail]) Perry Cheng ([e-mail])Tutorial Expectations• Audience– GC Researchers– VM implementors looking for a memory mangementsystem Takeaway– An understanding of what MMTk is Flexible with high performance GC research infrastructure allowing fair comparisons– How to build/extend a garbage collector in MMTk Format– Interactive– Keep in mind the varying levels of expertise in audienceOutline Part 0: A review of GC (~10 minutes) Part 1: MMTk Overview (~10 minutes) Part 2: Structure of MMTk (~30 minutes) BREAK (15 minutes) Part 3: Demo: Writing a Collector (~1 hour) Q&A (15 minutes)What is Garbage Collection (GC)? Automatic Memory Management– Minimal programmer interface allocate deallocate– Optional application-level interface Heap size pause time GC hints, …– Avoid error-prone manual memory management Dangling pointers and resource leakage But not all memory leaks Increasingly popular because of runtime safety– Java, C#, Perl, Python, LISP, ML, Haskell, …– Even C/C++ (smart pointers, conservative collectors)How does GC work? Approximate liveness by reachability–Liveness→ Reachability–Unreachable → Dead (garbage)–Both deadness and unreachability are stable properties GC reclaims the space of unreachable objectsIdentifying Garbage Normal program execution– Allocate objects– Mutate edges GC triggers when space exhausted– Start ...

Informations

• Publié par: Anjo
• Nombre de lectures: 25
• Langue: English

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