buffer-builder: Library for efficiently building up buffers, one piece at a time

[ bsd3, data, library ] [ Propose Tags ]

Data.BufferBuilder is an efficient library for incrementally building up ByteStrings, one chunk at a time. Early benchmarks show it is over twice as fast as ByteString Builder, primarily because BufferBuilder is built upon an ST-style restricted monad and mutable state instead of ByteString Builder's monoidal AST.

Internally, BufferBuilder is backed by a few C functions. Examination of GHC's output shows nearly optimal code generation with no intermediate thunks -- and thus, continuation passing and its associated indirect jumps and stack traffic only occur when BufferBuilder is asked to append a non-strict ByteString.

I benchmarked four approaches with a URL encoding benchmark:

  • State monad, concatenating ByteStrings: 6.98 us

  • State monad, ByteString Builder: 2.48 us

  • Crazy explicit RealWorld baton passing with unboxed state: 28.94 us (GHC generated really awful code for this, but see the revision history for the technique)

  • C + FFI + ReaderT: 1.11 us

Using BufferBuilder is very simple:

import qualified Data.BufferBuilder as BB

let byteString = BB.runBufferBuilder $ do
      BB.appendBS "http"
      BB.appendChar8 '/'
      BB.appendBS "//"

This package also provides Data.BufferBuilder.Utf8 for generating UTF-8 buffers and Data.BufferBuilder.Json for encoding data structures into JSON.


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Versions [RSS],,,,,,,,,,,,,,,,,, (info)
Change log changelog.md
Dependencies base (>=4 && <5), bytestring, mtl, semigroups, text, unordered-containers, vector [details]
License BSD-3-Clause
Copyright IMVU Inc., Chad Austin, Andy Friesen
Author Chad Austin, Andy Friesen
Maintainer chad@chadaustin.me
Category Data
Home page https://github.com/chadaustin/buffer-builder
Uploaded by chadaustin at 2022-05-13T20:55:34Z
Distributions LTSHaskell:, NixOS:
Reverse Dependencies 5 direct, 5 indirect [details]
Downloads 14516 total (50 in the last 30 days)
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Status Docs available [build log]
Last success reported on 2022-05-13 [all 1 reports]