Popularity
6.1
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0.0
Stable
15
5
0
Monthly Downloads: 24
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Latest version: v0.4.0.0
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README
unboxed-ref
This package provide fast unboxed references for ST and IO monad and atomic operations for IORefU Int type. Unboxed reference is implemented using single cell MutableByteArray s to eliminate indirection overhead which MutVar# s a carry, on the otherhand unboxed reference only support limited type(instances of Prim class).
A simple diagram could show the difference between IORef Int with IORefU Int:
data Foo = Foo {-# UNPACK #-} (IORef Int)
+-----------+ +-------------+ +---------+
| Foo | * +--->+ MutVar# | * +--->+ I# | i# |
+-----------+ +-------------+ +---------+
data Bar = Bar {-# UNPACK #-} (IORefU Int)
+-----------+ +------------------------+
| Bar | * +--->+ MutableByteArray# | i# |
+-----------+ +------------------------+
Benchmark
Modified from this benchmark.
$ cd bench && cabal build
$ time ./dist/build/bench-ref/bench-ref
143
./dist/build/bench-ref/bench-ref 19.76s user 0.02s system 99% cpu 19.785 total
------------------------------------------------------------
$ time ./dist/build/bench-unboxed-ref/bench-unboxed-ref
143
./dist/build/bench-unboxed-ref/bench-unboxed-ref 16.66s user 0.02s system 99% cpu 16.694 total
------------------------------------------------------------
$ ./dist/build/bench-unboxed-ref-atomic/bench-unboxed-ref-atomic
50500000
------------------------------------------------------------
$ ./dist/build/bench-ref-atomic/bench-ref-atomic
3597361