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# How to measure the memory usage
## 1. Install gnuplot
If you need a graph of memory usage, it can draw the graph with `gnuplot`.
With `Homebrew`, you can install `gnuplot` like
```
$ brew install gnuplot
```
## 2. Retrieve two performance data `before` / `after`
Retrieve data before applying patches.
```
$ rake build
$ gem install pkg/rmagick-3.1.0.gem
$ cd benchmarks/memory
$ ruby image_new.rb > before.csv
```
Apply the patches then retrieve improved data.
```
$ rake build
$ gem install pkg/rmagick-3.1.0.gem
$ cd benchmarks/memory
$ ruby image_new.rb > after.csv
```
## 3. Draw the performance graph
Launch `gnuplot` and execute `load 'rmagick.gnuplot'` command in prompt then the performance graph will be drew.
```
$ cd benchmarks/memory
$ gnuplot
G N U P L O T
Version 5.2 patchlevel 7 last modified 2019-05-29
Copyright (C) 1986-1993, 1998, 2004, 2007-2018
Thomas Williams, Colin Kelley and many others
gnuplot home: http://www.gnuplot.info
faq, bugs, etc: type "help FAQ"
immediate help: type "help" (plot window: hit 'h')
Terminal type is now 'qt'
gnuplot> load 'rmagick.gnuplot'
```
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