Comments (2)
Try adding a call to weight_max
in there? The default -- which I suspect I should change -- is to assume that each task is very cheap. weight_max
tells is to treat tasks as very expensive, and hence to avoid lumping them together.
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Ahhh, I see. That did indeed fix it, full usage across all cores. Dropped from 40s to 5s :)
I assumed that Rayon assumed the opposite: each task was expensive, and so maybe my tasks weren't expensive enough and were finishing quicker than Rayon could schedule them. I'll read up on the weighting code, perhaps a middle-ground will work better.
Tangentially, would it be possible for each task to set it's own weight? E.g. each Page knows how much work it needs to compute before it starts computing, and is relatively variable. It might be nice if each individual task can set it's weight dynamically. Not sure if that's feasible with Rayon's architecture though.
Thanks for the help (and for Rayon in general)!
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Related Issues (20)
- Suggestion for stack size when calling par_sort_unstable HOT 5
- Tag missing for release 1.10.0 HOT 1
- Unable to parallelize properly using `par_iter` or `par_bridge` HOT 8
- Documentation for `ParallelIterator::fold` and/or `ParallelIterator::reduce` seam to be incorrect HOT 5
- Slowdown when using deeply nested vector HOT 6
- Potential `len` method ambiguity in `src/range.rs` HOT 5
- Potential to fix memory ordering for value HOT 2
- a broadcast that only gets executed on idle threads
- `in_place_scope` documentation is confusing/unclear HOT 14
- use_current_thread and the global thread pool HOT 2
- Why does ThreadPool block until a operation is finished? HOT 1
- A way to hook before/after job execution (and/or a way to see a number of tasks in the processing queue)
- Function dependencies with Rayon without blocking the thread / Rayon synchronization primitives?
- Add synchronization guarantees for `ParallelIterator::for_each*` HOT 1
- Par bridge with optional buffering IO handling HOT 1
- Thread pool without work stealing HOT 6
- Question about return types from .map() HOT 4
- Terribly inefficient design and possible solution HOT 5
- [Discussion] Is it possible to impl `IntoIterator` for `ParallelIterator`? HOT 3
- Yield locks HOT 1
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