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Why GC?

Why GC?. What is it? (12 clockwise) Why? Why not? (6 clockwise) Is Java the first/final victory for GC? Who has built a garbage collector?. Basic GC Forms. Reference counting (3 clockwise) Mark and sweep (8 clockwise) Copying collection (4 clockwise) Treadmill (9 clockwise)

nathaniel-rich
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Why GC?

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Presentation Transcript

  1. Why GC? • What is it? (12 clockwise) • Why? Why not? (6 clockwise) • Is Java the first/final victory for GC? • Who has built a garbage collector?

  2. Basic GC Forms • Reference counting (3 clockwise) • Mark and sweep (8 clockwise) • Copying collection (4 clockwise) • Treadmill (9 clockwise) • What would you use?

  3. Incremental Collection • What’s the problem? What’s a mutator? Why is it hard? (1 clockwise) • Explain tricolor marking (7 clockwise) • Concurrent marking and sweeping (Lucent paper) uses more colors

  4. Generational GC • What is the problem? What are the underlying assumptions? (2 clockwise) • How does it work? (11 clockwise) • Generational stack collection (this PLDI)

  5. Other Forms • Parallel GC • How does this relate to incremental GC? (9 clockwise) • Distributed GC • Why might this be hard? (5 clockwise)

  6. Random Stuff • Minsky’s original copying collector • used disk • hmm -- disk bandwidths are high today… • Identifying garbage is the expensive part • Lifetime analysis is somewhat popular • Linear logic

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