Open Bug 1960435 Opened 6 months ago Updated 6 months ago

Tune heuristics for offthread baseline compilation

Categories

(Core :: JavaScript Engine: JIT, task, P1)

Product:
Core
Component:
JavaScript Engine: JIT
Type:
task

Tracking

()

People

(Reporter: iain, Unassigned)

References

(Blocks 1 open bug)

Details

After bug 1960433 lands, offthread baseline compilation will be feature complete. However, I haven't done any tuning to figure out how it should affect our compilation thresholds.

Important questions:

  1. At what threshold should we insert a baseline function into the queue? Currently, I haven't changed the number from main-thread baseline.
  2. At what threshold should we force-dispatch the contents of the queue, even if it's not full? Currently, I have hardcoded that threshold to 2x the baseline warmup threshold.
  3. What's the best value for the queue capacity?
  4. How does this interact with JIT hints? Should we be eg eagerly pushing scripts into the queue?

Hopefully we can find a set of answers to these questions that speeds up sp3.

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