[Haskell-cafe] Announcing binary-parsers

韩冬(基础平台部) handongwinter at didichuxing.com
Sun Oct 2 10:17:47 UTC 2016

Hi wren!

Yes, i noticed that attoparsec's numeric parsers are slow. I have a benchmark set to compare attoparsec and binary-parsers on different sample JSON files, it's on github: https://github.com/winterland1989/binary-parsers.

I'm pretty sure bytestring-lexing helped a lot, for example, the average decoding speed improvement is around 20%, but numeric only benchmarks(integers and numbers) improved by 30% !

Parsing is just a part of JSON decoding, lots of time is spent on unescaping, .etc. So the parser's improvement is quite large IMHO.

BTW, can you provide a version of lexer which doesn't check whether a Word is a digit? In binary-parsers i use something like `takeWhile isDigit` to extract the input ByteString, so there's no need to verify this in lexer again. Maybe we can have another performance improvement.



From: winterkoninkje at gmail.com <winterkoninkje at gmail.com> on behalf of wren romano <wren at community.haskell.org>
Sent: Sunday, October 2, 2016 10:39 AM
To: 韩冬(基础平台部)
Cc: haskell-cafe at haskell.org
Subject: Re: [Haskell-cafe] Announcing binary-parsers

On Thu, Sep 22, 2016 at 7:47 PM, 韩冬(基础平台部)
<handongwinter at didichuxing.com> wrote:
> Hi all,
> I am happy to announce binary-parsers. A ByteString parsing library built on
> binary. I borrowed lots of design/tests/document from attoparsec so that i
> can build its shape very quickly, thank you bos! And thanks to binary's
> excellent design, the codebase is very small(<500 loc).
> From my benchmark, it’s insanely fast, it outperforms attoparsec by 10%~30%
> in aeson benchmark. it’s also slightly faster than scanner(a
> non-backtracking parser designed for speed) in http request benchmark. I’d
> like to ask you to give it a shot if you need super fast ByteString parsing.

Yay! more users of my bytestring-lexing package :)

Since attoparsec's numeric parsers are dreadfully slow, can you tell
how much of your speedup is due to bytestring-lexing vs how much is
due to other differences vs aeson?

Live well,

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