sharp/docs/performance.md

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# Performance
### Test environment
* AWS EC2 eu-central-1 [c4.xlarge](http://aws.amazon.com/ec2/instance-types/#c4) (4x E5-2666 v3 @ 2.90GHz)
* Ubuntu 16.04.1 LTS (HVM, SSD, 20161115, ami-82cf0aed)
* Node.js v6.9.1
### The contenders
* [jimp](https://www.npmjs.com/package/jimp) v0.2.27 - Image processing in pure JavaScript. Bilinear interpolation only.
* [lwip](https://www.npmjs.com/package/lwip) v0.0.9 - Wrapper around CImg. Compiles outdated, insecure dependencies from source.
* [mapnik](https://www.npmjs.org/package/mapnik) v3.5.14 - Whilst primarily a map renderer, Mapnik contains bitmap image utilities.
* [imagemagick-native](https://www.npmjs.com/package/imagemagick-native) v1.9.3 - Wrapper around libmagick++, supports Buffers only.
* [imagemagick](https://www.npmjs.com/package/imagemagick) v0.1.3 - Supports filesystem only and "*has been unmaintained for a long time*".
* [gm](https://www.npmjs.com/package/gm) v1.23.0 - Fully featured wrapper around GraphicsMagick's `gm` command line utility.
* sharp v0.17.0 / libvips v8.4.2 - 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.
### Results
| Module | Input | Output | Ops/sec | Speed-up |
| :----------------- | :----- | :----- | ------: | -------: |
| jimp (bilinear) | buffer | buffer | 1.06 | 1.0 |
| lwip | buffer | buffer | 1.87 | 1.8 |
| mapnik | buffer | buffer | 2.91 | 2.7 |
| imagemagick-native | buffer | buffer | 4.03 | 3.8 |
| imagemagick | file | file | 7.10 | 6.7 |
| gm | buffer | buffer | 7.08 | 6.7 |
| gm | file | file | 7.10 | 6.7 |
| sharp | stream | stream | 27.61 | 26.0 |
| sharp | file | file | 28.41 | 26.8 |
| sharp | buffer | file | 28.71 | 27.1 |
| sharp | file | buffer | 28.60 | 27.0 |
| sharp | buffer | buffer | 29.08 | 27.4 |
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.
### Benchmark test prerequisites
Requires both _ImageMagick_ and _GraphicsMagick_:
```sh
brew install imagemagick
brew install graphicsmagick
```
```sh
sudo apt-get install imagemagick libmagick++-dev graphicsmagick
```
```sh
sudo yum install ImageMagick-devel ImageMagick-c++-devel GraphicsMagick
```
### Running the benchmark test
```sh
git clone https://github.com/lovell/sharp.git
cd sharp
npm install
cd test/bench
npm install
npm test
```