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Reconsidering Garbage Collection in Julia: A Practitioner Report

on YouTube 19m
Talkat ISMM 2025 · on Tuesday, 2025-06-17· [machine-learning]

speakers

name:Luis Eduardo de Souza Amorim
links:none on file
name:Yi Lin
links:none on file
name:Stephen M. Blackburn
links:none on file
name:Diogo Netto
links:none on file
name:Gabriel Baraldi
links:none on file
name:Nathan Daly
links:none on file
name:Antony L. Hosking
links:none on file
name:Kiran Pamnany
links:none on file
name:Oscar Smith
links:none on file

resources

video:https://youtu.be/ItfYCbmk_cY
slides:none on file

summary

A third‑party heap interface for Julia is implemented and integrated with MMTk, enabling multiple GC plans (no‑GC, IMIX/EMIX non‑moving variants and sticky mark‑bits) to run in Julia; non‑moving collectors are straightforward and prototypes land by 2023, and the interface and non‑moving images are upstreamed. Moving collection is hard but achievable: initial transitive pinning works but pins too many objects, so the team adds conservative stack scanning and pins from about 11 runtime types and specific emitted-code sites to make copying GC practical by 2025.

AI-written summary · about

chapters (11)

  1. 0:00Julia GC challenges
  2. 1:04Rethinking Julia's GC
  3. 2:33Julia and its GC
  4. 3:35MMTk for GC experiments
  5. 4:59Non-moving GCs in Julia
  6. 7:52Moving GCs in Julia
  7. 11:49Enabling moving GC in Julia
  8. 15:27GC interface and future work
  9. 16:10Q&A: Concurrency and GC
  10. 16:53Q&A: Community acceptance
  11. 17:59Q&A: Portability

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