[Haskell-cafe] Announce: bytestring 0.9.1.0

[Gwern Branwen]

On 2008.04.20 15:09:33 -0700, Don Stewart <dons at galois.com> scribbled 1.7K characters:
>
> Hey all,
>
> I'm pleased to announce a new major release of bytestring, the efficient
> string library for Haskell, suitable for high-performance scenarios.
>
> This release is primarily an (incremental) performance improvement
> release, though with some notable significant improvements, along with
> long term test coverage and quality control changes.
>
> Highlights:
>
>     * a long term performance bug with Ord instances, involving very
>       small strings, and Data.Map has been squashed.
>
>     * everything's a little faster -- shootout problems showed a 1-5%
>       speedup just by switching to the new library.
>
> Thanks goes to the Hac4 Haskell Hackathon organisers, in Gothenburg,
> Sweden, where the majority of this work to create this release took place.
>
> Key changes:
>
>   * Data.Map short key performance greatly improved:
>         - 'words Map'  running time:
>                 6.310s bytestring 0.9.0.1
>                 1.071s bytestring 0.9.1.0
>
>   * Uses cheaper unsafeDupablePerformIO for allocation.
>         - tail recursive tight loops (fixes obscure stack overflow)
>
>   * Generally faster:
>         - Shootout sum-file: 1.218s to 1.190s
>         - Shooout fasta:     9.210s to 8.811s
>
>   * 4-5x faster small substring search (breakSubstring/findSubstring/isInfixOf).
>
>   * Extensive QuickCheck coverage reporting and improvements:
>         - http://code.haskell.org/~dons/tests/bytestring/hpc_index.html
>
> Get the code:
>
>     http://hackage.haskell.org/cgi-bin/hackage-scripts/package/bytestring
>
> Note that if you upgrade to the new bytestring release, older packages
> built against previous releases will still require the old bytestring
> package. For best results, rebuild any bytestring-depending packages
> against the new library only.
>
> Cheers,
>    Don

That's all good news; will this release of ByteString be used for GHC 6.8.3? I'm a little tired of linking everything against 0.9.0.1 just so I can use Yi (since GHC/the-GHC-API links against it). :)

--
gwern
NSDM USP Edens SAS kibo quarter NSES Gamma MP5k threat
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