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69 lines
2.4 KiB
Markdown
69 lines
2.4 KiB
Markdown
# Performance
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A test to benchmark the performance of this module relative to alternatives.
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## The contenders
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* [jimp](https://www.npmjs.com/package/jimp) v0.9.3 - Image processing in pure JavaScript. Provides bicubic interpolation.
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* [mapnik](https://www.npmjs.org/package/mapnik) v4.3.1 - Whilst primarily a map renderer, Mapnik contains bitmap image utilities.
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* [imagemagick](https://www.npmjs.com/package/imagemagick) v0.1.3 - Supports filesystem only and "*has been unmaintained for a long time*".
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* [gm](https://www.npmjs.com/package/gm) v1.23.1 - Fully featured wrapper around GraphicsMagick's `gm` command line utility.
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* sharp v0.24.0 / libvips v8.9.0 - Caching within libvips disabled to ensure a fair comparison.
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## The task
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Decompress a 2725x2225 JPEG image,
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resize to 720x588 using Lanczos 3 resampling (where available),
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then compress to JPEG at a "quality" setting of 80.
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## Test environment
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* AWS EC2 eu-west-1 [c5.large](https://aws.amazon.com/ec2/instance-types/c5/) (2x Xeon Platinum 8124M CPU @ 3.00GHz)
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* Ubuntu 18.04 (hvm-ssd/ubuntu-bionic-18.04-amd64-server-20180912 ami-00035f41c82244dab)
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* Node.js v12.14.1
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## Results
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| Module | Input | Output | Ops/sec | Speed-up |
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| :----------------- | :----- | :----- | ------: | -------: |
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| jimp | buffer | buffer | 0.72 | 1.0 |
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| mapnik | buffer | buffer | 3.02 | 4.2 |
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| gm | buffer | buffer | 3.90 | 5.4 |
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| gm | file | file | 3.94 | 5.5 |
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| imagemagick | file | file | 4.30 | 6.0 |
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| sharp | stream | stream | 23.65 | 32.8 |
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| sharp | file | file | 24.66 | 34.3 |
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| sharp | buffer | buffer | 25.14 | 34.9 |
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Greater libvips performance can be expected with caching enabled (default)
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and using 8+ core machines, especially those with larger L1/L2 CPU caches.
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The I/O limits of the relevant (de)compression library will generally determine maximum throughput.
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## Running the benchmark test
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Requires _ImageMagick_, _GraphicsMagick_ and _Mapnik_:
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```sh
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brew install imagemagick
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brew install graphicsmagick
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brew install mapnik
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```
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```sh
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sudo apt-get install imagemagick libmagick++-dev graphicsmagick libmapnik-dev
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```
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```sh
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sudo yum install ImageMagick-devel ImageMagick-c++-devel GraphicsMagick mapnik-devel
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```
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```sh
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git clone https://github.com/lovell/sharp.git
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cd sharp
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npm install
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cd test/bench
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npm install
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npm test
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```
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