stm-containers
restricted-workers
| stm-containers | restricted-workers | |
|---|---|---|
| 3 | - | |
| 68 | 39 | |
| - | - | |
| 4.1 | 0.0 | |
| 3 months ago | almost 10 years ago | |
| Haskell | Haskell | |
| MIT License | BSD 3-clause "New" or "Revised" License |
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stm-containers
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Concurrency in Haskell: Fast, Simple, Correct
https://hackage.haskell.org/package/stm-containers
This library is full of STM-oriented data structures. They perform better than a simple `TVar (Map k v)`.
It's kind of a fun trick actually. The stock Map is just a tree. The STM Map is also a tree but with TVars at each node. So this helps a lot with contention - you only contend along a "spine" instead of across the whole tree, which is O(log n).
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Software Transactional Memory (1997)
I think you are right about STM being roughly equivalent to snapshot isolation.
What STM offers is an easy way to invent "containers for snapshotted values" aka TVars. Using them carefully may result in better scaling: https://hackage.haskell.org/package/stm-containers
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How to achieve "Run at most one parallel async action per user"?
how about use stm-containers?
restricted-workers
We haven't tracked posts mentioning restricted-workers yet.
Tracking mentions began in Dec 2020.
What are some alternatives?
theatre - Minimalistic actor library for Haskell
unagi-chan - A haskell library implementing fast and scalable concurrent queues for x86, with a Chan-like API
stm-chunked-queues - Thread communication queues that group items/requests that occur close together in time
streamly - High performance, concurrent functional programming abstractions
stm-incremental - A very simple interface for incremental computation using STM in Haskell.
async-dejafu - Systematic concurrency testing meets Haskell.