speculation: A framework for safe, programmable, speculative parallelism
A framework for safe, programmable, speculative parallelism, loosely based on:
Prakash Prabhu, G. Ramalingam, and Kapil Vaswani, "Safe Programmable Speculative Parallelism", In the proceedings of Programming Language Design and Implementation (PLDI) Vol 45, Issue 6 (June 2010) pp 50-61. http://research.microsoft.com/pubs/118795/pldi026-vaswani.pdf
This package provides speculative function application and speculative folds. Speculative STM transactions take the place of the transactional rollback machinery from the paper.
For example:
spec g f af g while forcing a, if g == a then f g is returned, otherwise f a is evaluated and returned. Furthermore, if the argument has already been evaluated, we skip the f g computation entirely. If a good guess at the value of a is available, this is one way to induce parallelism in an otherwise sequential task. However, if the guess isn't available more cheaply than the actual answer, then this saves no work and if the guess is wrong, you risk evaluating the function twice.
The best-case timeline looks like:
[---- f g ----] [----- a -----] [-- spec g f a --]
The worst-case timeline looks like:
[---- f g ----]
[----- a -----]
[---- f a ----]
[------- spec g f a -----------]Compare these to the timeline of f $! a:
[---- a -----]
[---- f a ----]specSTM provides a similar time table for STM actions, but also rolls back side-effects.
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Automatic Flags
| Name | Description | Default |
|---|---|---|
| optimize | Enable optimizations | Enabled |
| tests | Build the tests | Enabled |
| benchmarks | Build the benchmarks | Enabled |
| hpc | Use HPC for tests | Enabled |
| nolib | Don't build the library. Useful for speeding up the modify-build-test cycle. | Disabled |
Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info
Downloads
- speculation-0.8.0.1.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)
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| Versions [RSS] | 0.0.0, 0.0.1, 0.0.2, 0.1.0, 0.2.0, 0.3.0, 0.4.0, 0.5.0, 0.5.1, 0.6.0, 0.7.0, 0.8.0, 0.8.0.1, 0.8.0.2, 0.8.1.0, 0.8.2.0, 0.9.0.0, 1.0.0.0, 1.1.0.0, 1.2.0.0, 1.2.0.1, 1.2.0.2, 1.3, 1.4, 1.4.1, 1.4.1.1, 1.4.1.2, 1.5, 1.5.0.1, 1.5.0.2, 1.5.0.3 |
|---|---|
| Change log | CHANGELOG.markdown |
| Dependencies | base (>=4 && <6), containers (>=0.3.0 && <0.4), criterion (>=0.5 && <0.6), HUnit (>=1.2.2.1 && <1.3), parallel (>=2.2 && <2.3), QuickCheck (>=1.2.0.0 && <1.3), stm (>=2.1 && <2.2), test-framework (>=0.2.4 && <0.3), test-framework-hunit (>=0.2.4 && <0.3), test-framework-quickcheck (>=0.2.4 && <0.3) [details] |
| Tested with | ghc ==6.12.1 |
| License | BSD-3-Clause |
| Copyright | (c) 2010 Edward A. Kmett |
| Author | Edward A. Kmett |
| Maintainer | Edward A. Kmett <ekmett@gmail.com> |
| Category | Concurrency |
| Home page | http://github.com/ekmett/speculation |
| Source repo | head: git clone http://github.com/ekmett/speculation.git -b master |
| Uploaded | by EdwardKmett at 2010-06-28T07:18:36Z |
| Distributions | |
| Reverse Dependencies | 3 direct, 8125 indirect [details] |
| Executables | benchmark-speculation, test-speculation |
| Downloads | 24746 total (2 in the last 30 days) |
| Rating | 2.0 (votes: 1) [estimated by Bayesian average] |
| Your Rating | |
| Status | Docs uploaded by user Build status unknown [no reports yet] |