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Continuation-Centric Computing with Arca

on YouTube 21m
Talkat 20th USENIX Symposium on Operating Systems Design and Implementation (OSDI '26) · 2026-07-13..07-15· [serverless, software-architecture]

speakers

name:Akshay Srivatsan
links:none on file
name:Yuhan Deng
links:none on file
name:Katherine Mohr
links:none on file
name:Emma Sudo
links:none on file
name:Sebastian Ingino
links:none on file
name:Francis Chua
links:none on file
name:Keith Winstein
links:none on file

resources

video:https://youtu.be/B_mnNgK0uME
slides:none on file

summary

Arca is a continuation-centric OS that provides kernel-level continuation capture via a new syscall pair get_current_continuation and call_with_current_continuation, making captures effectively free on syscalls and costing about 2 microseconds to capture. It enforces no shared mutable memory and forbids kernel bypass so continuations are serializable and copyable; thumbnailing benchmarks drop a 100 ms download-bound function to ~3 ms by shipping a tiny continuation instead of the file. Arca runs unmodified WebAssembly (via musl-linked C) but is not Linux-compatible.

AI-written summary · about

chapters (8)

  1. 0:00Continuation-centric computing intro
  2. 2:50Why continuations matter
  3. 5:18Implicit continuation usage
  4. 10:12Designing Arca for continuations
  5. 13:02Transparent continuations
  6. 15:32New optimizations with Arca
  7. 19:25Arca limitations and compatibility
  8. 20:49Conclusion and future work

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