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Bryan O'Sullivan's blog
Blog Archives
criterion 1.0
Almost five years after I initially released criterion, I'm delighted to announce a major release with a large number of appealing new features. As always, you can install the latest goodness using cabal install criterion, or fetch the source from…
Posted in haskell, open source
A major upgrade to attoparsec: more speed, more power
I’m pleased to introduce the third generation of my attoparsec parsing library. With a major change to its internals, it is both faster and more powerful than previous versions, while remaining backwards compatible. Comparing to C Let’s start with a…
Posted in haskell, open source
Top Haskell packages seen through graph centrality beer goggles
I threw together a little code tonight to calculate the Katz centrality of packages on Hackage. This is a measure that states that a package is important if an important package depends on it. The definition is recursive, as is…
Posted in haskell, open source
New year, new library releases, new levels of speed
I just released new versions of the Haskell text, attoparsec, and aeson libraries on Hackage, and there’s a surprising amount to look forward to in them. The summary for the impatient: some core operations in text and aeson are now…
Posted in haskell, open source
Testing a UTF-8 decoder with vigour
Yesterday, Michael Snoyman reported a surprising regression in version 1.0 of my Haskell text library: for some invalid inputs, the UTF-8 decoder was truncating the invalid data instead of throwing an exception. Thanks to Michael providing an easy repro, I…
Open question: help me design a new encoding API for aeson
For a while now, I’ve had it in mind to improve the encoding performance of my Haskell JSON package, aeson. Over the weekend, I went from hazy notion to a proof of concept for what I think could be a…
Posted in haskell, open source
(re)announcing statprof, a statistical profiler for Python
Back in 2005, Andy Wingo wrote a neat little statistical profiler named statprof that promptly disappeared into obscurity. It has since languished almost unknown, with a handful of people writing semi-private forks that themselves seem to be dead. Statistical profiling…
Posted in open source, python
aeson 0.4: easier, faster, better
After months of work, and a number of great contributions from other developers, I just released version 0.4 of aeson, the de facto standard Haskell JSON library. This is a major release, with a number of improvements. Enjoy! Ease of…
Posted in haskell, open source
The future of MailRank’s open source technologies
(Cross-posted from the MailRank engineering blog.) You may have seen my exciting news about our upcoming move to Facebook. It’s been a total blast working on our product, and of course as we did so we released a number of…
Posted in haskell, open source
A major new release of the Haskell statistics library
I'm pleased to announce a major release of of the Haskell statistics library, version 0.10.0.0. I'd particularly like to thank Alexey Khudyakov for his wonderful work on this release. New features: Student-T, Fisher-Snedecor, F-distribution, and Cauchy-Lorentz distributions are added. Histogram…
Posted in haskell, open source
