Performance

A test to benchmark the performance of this module relative to alternatives.

The contenders

jimp v0.8.4 - Image processing in pure JavaScript. Provides bicubic interpolation.
mapnik v4.3.1 - Whilst primarily a map renderer, Mapnik contains bitmap image utilities.
imagemagick v0.1.3 - Supports filesystem only and "has been unmaintained for a long time".
gm v1.23.1 - Fully featured wrapper around GraphicsMagick's gm command line utility.
sharp v0.23.1 / libvips v8.8.1 - Caching within libvips disabled to ensure a fair comparison.

The task

Decompress a 2725x2225 JPEG image, resize to 720x588 using Lanczos 3 resampling (where available), then compress to JPEG at a "quality" setting of 80.

Test environment

AWS EC2 eu-west-1 c5.large (2x Xeon Platinum 8124M CPU @ 3.00GHz)
Ubuntu 18.04 (hvm-ssd/ubuntu-bionic-18.04-amd64-server-20180912 ami-00035f41c82244dab)
Node.js v12.10.0

Results

Module	Input	Output	Ops/sec	Speed-up
jimp	buffer	buffer	0.66	1.0
mapnik	buffer	buffer	3.31	5.0
gm	buffer	buffer	3.79	5.7
gm	file	file	3.82	5.8
imagemagick	file	file	4.17	6.3
sharp	stream	stream	25.81	39.1
sharp	file	file	26.76	40.5
sharp	buffer	buffer	28.06	42.5

Greater libvips performance can be expected with caching enabled (default) and using 8+ core machines, especially those with larger L1/L2 CPU caches.

The I/O limits of the relevant (de)compression library will generally determine maximum throughput.

Running the benchmark test

Requires ImageMagick, GraphicsMagick and Mapnik:

brew install imagemagick
brew install graphicsmagick
brew install mapnik

sudo apt-get install imagemagick libmagick++-dev graphicsmagick libmapnik-dev

sudo yum install ImageMagick-devel ImageMagick-c++-devel GraphicsMagick mapnik-devel

git clone https://github.com/lovell/sharp.git
cd sharp
npm install
cd test/bench
npm install
npm test

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