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

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 major implementations and benchmarked with the buildURL 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 "//"

Modules

[Index]

Downloads

• buffer-builder-0.1.0.0.tar.gz [browse] (Cabal source package)
• Package description (revised from the package)

Note: This package has metadata revisions in the cabal description newer than included in the tarball. To unpack the package including the revisions, use 'cabal get'.

Maintainer's Corner

Package maintainers

• chadaustin, afriesen

For package maintainers and hackage trustees

• edit package information

Candidates

• 0.1.0.0, 0.2.0.0, 0.2.0.1, 0.2.0.3, 0.2.1.0