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fast_rss

0.3.4
0.5.0 0.4.4 0.4.3 0.4.2 0.4.1 0.4.0 0.3.5 0.3.4 0.3.3 0.3.2 0.3.1 0.3.0 0.2.0 0.1.5 0.1.4 0.1.3 0.1.2 0.1.1 0.1.0

Fast Elixir RSS feed parser, a NIF wrapper around the Rust RSS crate

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fast_rss README.md
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README.md 

<p align="center"> <img alt="FastRSS" src="https://avencera.github.io/fast_rss/logo.svg"> </p>
<p align="center">Parse RSS feeds very quickly </p>
<p align="center">
    <a href="https://hex.pm/packages/fast_rss"><img alt="Hex.pm" src="https://img.shields.io/hexpm/l/fast_rss"></a>
    <a href="https://hex.pm/packages/fast_rss"><img alt="Hex.pm" src="https://img.shields.io/hexpm/v/fast_rss"></a>
    <a href="https://hex.pm/packages/fast_rss"><img alt="Hex.pm" src="https://img.shields.io/hexpm/dt/fast_rss"></a>
    <a href="https://hexdocs.pm/fast_rss"><img alt="HexDocs.pm" src="https://img.shields.io/badge/hex-docs-purple.svg"></a>
</p>
<p align="center">
  <a href="#intro">Intro</a> 
  |
  <a href="#compatibility">Compatibility</a> 
  |
  <a href="#installation">Installation</a> 
  |
  <a href="#usage">Usage</a>
  |
  <a href="#benchmark">Benchmarks</a>
  |
  <a href="#deploying">Deploying</a>
  |
  <a href="LICENSE.md">License</a>
</p>
---
## Intro
Parse RSS feeds very quickly
- This is rust NIF built using [rustler](https://github.com/rusterlium/rustler)
- Uses the [RSS](https://crates.io/crates/rss) rust crate to do the actual RSS parsing
**Speed**
Currently this is already much faster than most of the pure elixir/erlang packages out there. In benchmarks there are speed improvements anywhere between **6.12x - 50.09x** over the next fastest package ([feeder_ex](https://github.com/manukall/feeder_ex)) that was tested.
Compared to the slowest elixir options tested ([feed_raptor](https://github.com/merongivian/feedraptor), [elixir_feed_parser](https://github.com/fdietz/elixir-feed-parser)), FastRSS was sometimes **259.91x** faster and used **5,412,308.17x** less memory _(0.00156 MB vs 8423.70 MB)_.
See full [benchmarks](#benchmark) below:
## Compatibility
FastRSS requires a minimum combination of Elixir 1.6.0 and Erlang/OTP 20.0, and is tested with a maximum combination of Elixir 1.10.1 and Erlang/OTP 22.0.
## Installation
This package is available on [hex](https://hex.pm/packages/fast_rss).
It can be installed by adding `fast_rss` to your list of dependencies in `mix.exs`:
```elixir
def deps do
  [
    {:fast_rss, "~> 0.3.4"}
  ]
end
```
You also need the rust compiler installed: https://www.rust-lang.org/tools/install
```bash
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
```
## Usage
There is only one function it takes an RSS string and outputs an `{:ok, map()}` with string keys.
```elixir
iex(1)>  {:ok, map_of_rss} = FastRSS.parse("...rss_feed_string...")
iex(2)> Map.keys(map_of_rss)
["categories", "cloud", "copyright", "description", "docs", "dublin_core_ext",
 "extensions", "generator", "image", "items", "itunes_ext", "language",
 "last_build_date", "link", "managing_editor", "namespaces", "pub_date",
 "rating", "skip_days", "skip_hours", "syndication_ext", "text_input", "title",
 "ttl", "webmaster"]
```
The docs can be found at [https://hexdocs.pm/fast_rss](https://hexdocs.pm/fast_rss).
### Supported Feeds
Reading from the following RSS versions is supported:
- RSS 0.90
- RSS 0.91
- RSS 0.92
- RSS 1.0
- RSS 2.0
- iTunes
- Dublin Core
## Benchmark
HTML: [https://avencera.github.io/fast_rss/](https://avencera.github.io/fast_rss/)
Benchmark run from 2020-02-22 05:23:47.524699Z UTC
### System
Benchmark suite executing on the following system:
<table style="width: 1%">
  <tr>
    <th style="width: 1%; white-space: nowrap">Operating System</th>
    <td>macOS</td>
  </tr><tr>
    <th style="white-space: nowrap">CPU Information</th>
    <td style="white-space: nowrap">Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz</td>
  </tr><tr>
    <th style="white-space: nowrap">Number of Available Cores</th>
    <td style="white-space: nowrap">16</td>
  </tr><tr>
    <th style="white-space: nowrap">Available Memory</th>
    <td style="white-space: nowrap">32 GB</td>
  </tr><tr>
    <th style="white-space: nowrap">Elixir Version</th>
    <td style="white-space: nowrap">1.10.1</td>
  </tr><tr>
    <th style="white-space: nowrap">Erlang Version</th>
    <td style="white-space: nowrap">22.2.6</td>
  </tr>
</table>
### Configuration
Benchmark suite executing with the following configuration:
<table style="width: 1%">
  <tr>
    <th style="width: 1%">:time</th>
    <td style="white-space: nowrap">30 s</td>
  </tr><tr>
    <th>:parallel</th>
    <td style="white-space: nowrap">1</td>
  </tr><tr>
    <th>:warmup</th>
    <td style="white-space: nowrap">5 s</td>
  </tr>
</table>
### Statistics
**Input: anxiety**
Run Time
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">IPS</th>
    <th style="text-align: right">Average</th>
    <th style="text-align: right">Devitation</th>
    <th style="text-align: right">Median</th>
    <th style="text-align: right">99th&nbsp;%</th>
  </tr>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap; text-align: right">188.57</td>
    <td style="white-space: nowrap; text-align: right">5.30 ms</td>
    <td style="white-space: nowrap; text-align: right">±8.26%</td>
    <td style="white-space: nowrap; text-align: right">5.45 ms</td>
    <td style="white-space: nowrap; text-align: right">6.43 ms</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap; text-align: right">3.70</td>
    <td style="white-space: nowrap; text-align: right">269.92 ms</td>
    <td style="white-space: nowrap; text-align: right">±5.34%</td>
    <td style="white-space: nowrap; text-align: right">268.12 ms</td>
    <td style="white-space: nowrap; text-align: right">316.12 ms</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap; text-align: right">2.99</td>
    <td style="white-space: nowrap; text-align: right">334.01 ms</td>
    <td style="white-space: nowrap; text-align: right">±2.44%</td>
    <td style="white-space: nowrap; text-align: right">331.03 ms</td>
    <td style="white-space: nowrap; text-align: right">371.28 ms</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap; text-align: right">1.94</td>
    <td style="white-space: nowrap; text-align: right">515.72 ms</td>
    <td style="white-space: nowrap; text-align: right">±1.94%</td>
    <td style="white-space: nowrap; text-align: right">516.10 ms</td>
    <td style="white-space: nowrap; text-align: right">536.05 ms</td>
  </tr>
</table>
Comparison
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">IPS</th>
    <th style="text-align: right">Slower</th>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap;text-align: right">188.57</td>
    <td>&nbsp;</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap; text-align: right">3.70</td>
    <td style="white-space: nowrap; text-align: right">50.9x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap; text-align: right">2.99</td>
    <td style="white-space: nowrap; text-align: right">62.99x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap; text-align: right">1.94</td>
    <td style="white-space: nowrap; text-align: right">97.25x</td>
  </tr>
</table>
Memory Usage
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">Memory</th>
      <th style="text-align: right">Factor</th>
  </tr>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap">0.00156 MB</td>
      <td>&nbsp;</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap">17.21 MB</td>
    <td>11004.73x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap">268.53 MB</td>
    <td>171693.91x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap">313.30 MB</td>
    <td>200316.09x</td>
  </tr>
</table>
<hr/>
**Input: ben**
Run Time
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">IPS</th>
    <th style="text-align: right">Average</th>
    <th style="text-align: right">Devitation</th>
    <th style="text-align: right">Median</th>
    <th style="text-align: right">99th&nbsp;%</th>
  </tr>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap; text-align: right">83.95</td>
    <td style="white-space: nowrap; text-align: right">11.91 ms</td>
    <td style="white-space: nowrap; text-align: right">±10.29%</td>
    <td style="white-space: nowrap; text-align: right">12.23 ms</td>
    <td style="white-space: nowrap; text-align: right">16.17 ms</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap; text-align: right">13.33</td>
    <td style="white-space: nowrap; text-align: right">75.04 ms</td>
    <td style="white-space: nowrap; text-align: right">±4.38%</td>
    <td style="white-space: nowrap; text-align: right">74.21 ms</td>
    <td style="white-space: nowrap; text-align: right">89.72 ms</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap; text-align: right">3.52</td>
    <td style="white-space: nowrap; text-align: right">284.18 ms</td>
    <td style="white-space: nowrap; text-align: right">±3.89%</td>
    <td style="white-space: nowrap; text-align: right">283.83 ms</td>
    <td style="white-space: nowrap; text-align: right">324.08 ms</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap; text-align: right">0.48</td>
    <td style="white-space: nowrap; text-align: right">2078.76 ms</td>
    <td style="white-space: nowrap; text-align: right">±0.52%</td>
    <td style="white-space: nowrap; text-align: right">2076.27 ms</td>
    <td style="white-space: nowrap; text-align: right">2097.44 ms</td>
  </tr>
</table>
Comparison
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">IPS</th>
    <th style="text-align: right">Slower</th>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap;text-align: right">83.95</td>
    <td>&nbsp;</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap; text-align: right">13.33</td>
    <td style="white-space: nowrap; text-align: right">6.3x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap; text-align: right">3.52</td>
    <td style="white-space: nowrap; text-align: right">23.86x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap; text-align: right">0.48</td>
    <td style="white-space: nowrap; text-align: right">174.51x</td>
  </tr>
</table>
Memory Usage
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">Memory</th>
      <th style="text-align: right">Factor</th>
  </tr>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap">0.00155 MB</td>
      <td>&nbsp;</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap">27.86 MB</td>
    <td>17990.96x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap">163.88 MB</td>
    <td>105811.88x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap">1577.41 MB</td>
    <td>1018492.36x</td>
  </tr>
</table>
<hr/>
**Input: daily**
Run Time
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">IPS</th>
    <th style="text-align: right">Average</th>
    <th style="text-align: right">Devitation</th>
    <th style="text-align: right">Median</th>
    <th style="text-align: right">99th&nbsp;%</th>
  </tr>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap; text-align: right">32.98</td>
    <td style="white-space: nowrap; text-align: right">0.0303 s</td>
    <td style="white-space: nowrap; text-align: right">±7.62%</td>
    <td style="white-space: nowrap; text-align: right">0.0313 s</td>
    <td style="white-space: nowrap; text-align: right">0.0339 s</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap; text-align: right">4.94</td>
    <td style="white-space: nowrap; text-align: right">0.20 s</td>
    <td style="white-space: nowrap; text-align: right">±4.61%</td>
    <td style="white-space: nowrap; text-align: right">0.199 s</td>
    <td style="white-space: nowrap; text-align: right">0.24 s</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap; text-align: right">0.64</td>
    <td style="white-space: nowrap; text-align: right">1.57 s</td>
    <td style="white-space: nowrap; text-align: right">±1.50%</td>
    <td style="white-space: nowrap; text-align: right">1.57 s</td>
    <td style="white-space: nowrap; text-align: right">1.63 s</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap; text-align: right">0.127</td>
    <td style="white-space: nowrap; text-align: right">7.88 s</td>
    <td style="white-space: nowrap; text-align: right">±0.23%</td>
    <td style="white-space: nowrap; text-align: right">7.88 s</td>
    <td style="white-space: nowrap; text-align: right">7.90 s</td>
  </tr>
</table>
Comparison
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">IPS</th>
    <th style="text-align: right">Slower</th>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap;text-align: right">32.98</td>
    <td>&nbsp;</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap; text-align: right">4.94</td>
    <td style="white-space: nowrap; text-align: right">6.68x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap; text-align: right">0.64</td>
    <td style="white-space: nowrap; text-align: right">51.86x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap; text-align: right">0.127</td>
    <td style="white-space: nowrap; text-align: right">259.91x</td>
  </tr>
</table>
Memory Usage
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">Memory</th>
      <th style="text-align: right">Factor</th>
  </tr>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap">0.00153 MB</td>
      <td>&nbsp;</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap">109.73 MB</td>
    <td>71555.78x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap">880.51 MB</td>
    <td>574178.95x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap">6386.12 MB</td>
    <td>4164382.64x</td>
  </tr>
</table>
<hr/>
**Input: dave**
Run Time
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">IPS</th>
    <th style="text-align: right">Average</th>
    <th style="text-align: right">Devitation</th>
    <th style="text-align: right">Median</th>
    <th style="text-align: right">99th&nbsp;%</th>
  </tr>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap; text-align: right">407.08</td>
    <td style="white-space: nowrap; text-align: right">2.46 ms</td>
    <td style="white-space: nowrap; text-align: right">±9.83%</td>
    <td style="white-space: nowrap; text-align: right">2.41 ms</td>
    <td style="white-space: nowrap; text-align: right">3.16 ms</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap; text-align: right">56.52</td>
    <td style="white-space: nowrap; text-align: right">17.69 ms</td>
    <td style="white-space: nowrap; text-align: right">±6.14%</td>
    <td style="white-space: nowrap; text-align: right">17.37 ms</td>
    <td style="white-space: nowrap; text-align: right">22.51 ms</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap; text-align: right">8.90</td>
    <td style="white-space: nowrap; text-align: right">112.31 ms</td>
    <td style="white-space: nowrap; text-align: right">±4.12%</td>
    <td style="white-space: nowrap; text-align: right">111.93 ms</td>
    <td style="white-space: nowrap; text-align: right">127.60 ms</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap; text-align: right">1.59</td>
    <td style="white-space: nowrap; text-align: right">628.45 ms</td>
    <td style="white-space: nowrap; text-align: right">±1.60%</td>
    <td style="white-space: nowrap; text-align: right">626.71 ms</td>
    <td style="white-space: nowrap; text-align: right">656.74 ms</td>
  </tr>
</table>
Comparison
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">IPS</th>
    <th style="text-align: right">Slower</th>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap;text-align: right">407.08</td>
    <td>&nbsp;</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap; text-align: right">56.52</td>
    <td style="white-space: nowrap; text-align: right">7.2x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap; text-align: right">8.90</td>
    <td style="white-space: nowrap; text-align: right">45.72x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap; text-align: right">1.59</td>
    <td style="white-space: nowrap; text-align: right">255.83x</td>
  </tr>
</table>
Memory Usage
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">Memory</th>
      <th style="text-align: right">Factor</th>
  </tr>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap">0.00157 MB</td>
      <td>&nbsp;</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap">9.25 MB</td>
    <td>5886.17x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap">80.42 MB</td>
    <td>51170.23x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap">571.18 MB</td>
    <td>363425.45x</td>
  </tr>
</table>
<hr/>
**Input: sleepy**
Run Time
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">IPS</th>
    <th style="text-align: right">Average</th>
    <th style="text-align: right">Devitation</th>
    <th style="text-align: right">Median</th>
    <th style="text-align: right">99th&nbsp;%</th>
  </tr>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap; text-align: right">760.30</td>
    <td style="white-space: nowrap; text-align: right">1.32 ms</td>
    <td style="white-space: nowrap; text-align: right">±16.62%</td>
    <td style="white-space: nowrap; text-align: right">1.21 ms</td>
    <td style="white-space: nowrap; text-align: right">2.03 ms</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap; text-align: right">124.28</td>
    <td style="white-space: nowrap; text-align: right">8.05 ms</td>
    <td style="white-space: nowrap; text-align: right">±6.94%</td>
    <td style="white-space: nowrap; text-align: right">8.03 ms</td>
    <td style="white-space: nowrap; text-align: right">10.32 ms</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap; text-align: right">26.26</td>
    <td style="white-space: nowrap; text-align: right">38.09 ms</td>
    <td style="white-space: nowrap; text-align: right">±5.08%</td>
    <td style="white-space: nowrap; text-align: right">37.81 ms</td>
    <td style="white-space: nowrap; text-align: right">44.42 ms</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap; text-align: right">3.21</td>
    <td style="white-space: nowrap; text-align: right">311.16 ms</td>
    <td style="white-space: nowrap; text-align: right">±2.85%</td>
    <td style="white-space: nowrap; text-align: right">307.86 ms</td>
    <td style="white-space: nowrap; text-align: right">345.09 ms</td>
  </tr>
</table>
Comparison
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">IPS</th>
    <th style="text-align: right">Slower</th>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap;text-align: right">760.30</td>
    <td>&nbsp;</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap; text-align: right">124.28</td>
    <td style="white-space: nowrap; text-align: right">6.12x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap; text-align: right">26.26</td>
    <td style="white-space: nowrap; text-align: right">28.96x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap; text-align: right">3.21</td>
    <td style="white-space: nowrap; text-align: right">236.57x</td>
  </tr>
</table>
Memory Usage
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">Memory</th>
      <th style="text-align: right">Factor</th>
  </tr>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap">0.00157 MB</td>
      <td>&nbsp;</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap">4.28 MB</td>
    <td>2726.19x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap">35.88 MB</td>
    <td>22829.92x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap">274.98 MB</td>
    <td>174963.99x</td>
  </tr>
</table>
<hr/>
**Input: stuff**
Run Time
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">IPS</th>
    <th style="text-align: right">Average</th>
    <th style="text-align: right">Devitation</th>
    <th style="text-align: right">Median</th>
    <th style="text-align: right">99th&nbsp;%</th>
  </tr>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap; text-align: right">19.19</td>
    <td style="white-space: nowrap; text-align: right">0.0521 s</td>
    <td style="white-space: nowrap; text-align: right">±9.19%</td>
    <td style="white-space: nowrap; text-align: right">0.0546 s</td>
    <td style="white-space: nowrap; text-align: right">0.0635 s</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap; text-align: right">0.93</td>
    <td style="white-space: nowrap; text-align: right">1.07 s</td>
    <td style="white-space: nowrap; text-align: right">±2.49%</td>
    <td style="white-space: nowrap; text-align: right">1.07 s</td>
    <td style="white-space: nowrap; text-align: right">1.15 s</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap; text-align: right">0.53</td>
    <td style="white-space: nowrap; text-align: right">1.88 s</td>
    <td style="white-space: nowrap; text-align: right">±1.22%</td>
    <td style="white-space: nowrap; text-align: right">1.89 s</td>
    <td style="white-space: nowrap; text-align: right">1.92 s</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap; text-align: right">0.0797</td>
    <td style="white-space: nowrap; text-align: right">12.54 s</td>
    <td style="white-space: nowrap; text-align: right">±1.61%</td>
    <td style="white-space: nowrap; text-align: right">12.44 s</td>
    <td style="white-space: nowrap; text-align: right">12.77 s</td>
  </tr>
</table>
Comparison
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">IPS</th>
    <th style="text-align: right">Slower</th>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap;text-align: right">19.19</td>
    <td>&nbsp;</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap; text-align: right">0.93</td>
    <td style="white-space: nowrap; text-align: right">20.59x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap; text-align: right">0.53</td>
    <td style="white-space: nowrap; text-align: right">36.11x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap; text-align: right">0.0797</td>
    <td style="white-space: nowrap; text-align: right">240.68x</td>
  </tr>
</table>
Memory Usage
<table style="width: 1%">
  <tr>
    <th>Name</th>
    <th style="text-align: right">Memory</th>
      <th style="text-align: right">Factor</th>
  </tr>
  <tr>
    <td style="white-space: nowrap">fast_rss</td>
    <td style="white-space: nowrap">0.00154 MB</td>
      <td>&nbsp;</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feeder_ex</td>
    <td style="white-space: nowrap">140.58 MB</td>
    <td>91220.55x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">elixir_feed_parser</td>
    <td style="white-space: nowrap">1018.78 MB</td>
    <td>661058.28x</td>
  </tr>
  <tr>
    <td style="white-space: nowrap">feed_raptor</td>
    <td style="white-space: nowrap">8424.44 MB</td>
    <td>5466379.81x</td>
  </tr>
</table>
<hr/>
## Deploying
Deploying rust NIFs can be a little bit annoying as you have to install the rust compiler. If you are having trouble deploying this package make an issue and I will try and help you out.
I will then add it to the FAQ below.
### Q. How do I deploy using an Alpine Dockerfile?
#### A. I recommend using a [multi-stage Dockerfile](https://docs.docker.com/develop/develop-images/multistage-build/), and doing the following
1. On the stages where you build all your deps, and build your release make sure to install `build-base` and `libgcc`:
```docker
# This step installs all the build tools we'll need
RUN apk update && \
    apk upgrade --no-cache && \
    apk add --no-cache \
    git \
    curl \
    build-base \
    libgcc  && \
    mix local.rebar --force && \
    mix local.hex --force
```
2. Install the rust compiler and allow dynamic linking to the C library by setting the rust flag
```docker
# install rustup
RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
ENV RUSTUP_HOME=/root/.rustup \
    RUSTFLAGS="-C target-feature=-crt-static" \
    CARGO_HOME=/root/.cargo  \
    PATH="/root/.cargo/bin:$PATH"
```
3. On the stage where you actually run your elixir release install `libgcc`:
```docker
################################################################################
## STEP 4 - FINAL
FROM alpine:3.11
ENV MIX_ENV=prod
RUN apk update && \
    apk add --no-cache \
    bash \
    libgcc \
    openssl-dev
COPY --from=release-builder /opt/built /app
WORKDIR /app
CMD ["/app/my_app/bin/my_app", "start"]
```
## License
FastRSS is released under the Apache License 2.0 - see the [LICENSE](LICENSE.md) file.