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2024-02-10 Joakim Frostegård
# UDP BitTorrent tracker throughput comparison
This is a performance comparison of several UDP BitTorrent tracker implementations.
Benchmarks were run using [aquatic_bencher](https://github.com/greatest-ape/aquatic), with `--cpu-mode subsequent-one-per-pair`.
## Software and hardware
### Tracker implementations
| Name | Commit |
|---------------|---------|
| [aquatic_udp] | 21a5301 |
| [opentracker] | 110868e |
| [chihaya] | 2f79440 |
[aquatic_udp]: https://github.com/greatest-ape/aquatic
[opentracker]: http://erdgeist.org/arts/software/opentracker/
[chihaya]: https://github.com/chihaya/chihaya
### OS and compilers
| Name | Version |
|--------|---------|
| Debian | 12.4 |
| Linux | 6.5.10 |
| rustc | 1.76.0 |
| GCC | 12.2.0 |
| go | 1.19.8 |
### Hardware
Hetzner CCX63: 48 dedicated vCPUs (AMD Milan Epyc 7003)
## Results
<table>
<caption>
<strong>UDP BitTorrent tracker troughput</strong>
<p>Average responses per second, best result.</p>
</caption>
<thead>
<tr>
<th>CPU cores</th>
<th>aquatic_udp (mio)</th>
<th>aquatic_udp (io_uring)</th>
<th>opentracker</th>
<th>chihaya</th>
</tr>
</thead>
<tbody>
<tr>
<th>1</th>
<td><span title="socket workers: 1, avg cpu utilization: 95.3%">186,939</span></td>
<td><span title="socket workers: 1, avg cpu utilization: 95.3%">226,065</span></td>
<td><span title="workers: 1, avg cpu utilization: 95.3%">190,540</span></td>
<td><span title="avg cpu utilization: 95.3%">55,989</span></td>
</tr>
<tr>
<th>2</th>
<td><span title="socket workers: 2, avg cpu utilization: 190%">371,478</span></td>
<td><span title="socket workers: 2, avg cpu utilization: 190%">444,353</span></td>
<td><span title="workers: 2, avg cpu utilization: 190%">379,623</span></td>
<td><span title="avg cpu utilization: 186%">111,226</span></td>
</tr>
<tr>
<th>4</th>
<td><span title="socket workers: 4, avg cpu utilization: 381%">734,709</span></td>
<td><span title="socket workers: 4, avg cpu utilization: 381%">876,642</span></td>
<td><span title="workers: 4, avg cpu utilization: 381%">748,401</span></td>
<td><span title="avg cpu utilization: 300%">136,983</span></td>
</tr>
<tr>
<th>6</th>
<td><span title="socket workers: 6, avg cpu utilization: 565%">1,034,804</span></td>
<td><span title="socket workers: 6, avg cpu utilization: 572%">1,267,006</span></td>
<td><span title="workers: 6, avg cpu utilization: 567%">901,600</span></td>
<td><span title="avg cpu utilization: 414%">131,827</span></td>
</tr>
<tr>
<th>8</th>
<td><span title="socket workers: 8, avg cpu utilization: 731%">1,296,693</span></td>
<td><span title="socket workers: 8, avg cpu utilization: 731%">1,521,113</span></td>
<td><span title="workers: 8, avg cpu utilization: 756%">1,170,928</span></td>
<td><span title="avg cpu utilization: 462%">131,779</span></td>
</tr>
<tr>
<th>12</th>
<td><span title="socket workers: 12, avg cpu utilization: 1064%">1,871,353</span></td>
<td><span title="socket workers: 12, avg cpu utilization: 957%">1,837,223</span></td>
<td><span title="workers: 12, avg cpu utilization: 1127%">1,675,059</span></td>
<td><span title="avg cpu utilization: 509%">130,942</span></td>
</tr>
<tr>
<th>16</th>
<td><span title="socket workers: 16, avg cpu utilization: 1126%">2,037,713</span></td>
<td><span title="socket workers: 16, avg cpu utilization: 1109%">2,258,321</span></td>
<td><span title="workers: 16, avg cpu utilization: 1422%">1,645,828</span></td>
<td><span title="avg cpu utilization: 487%">127,256</span></td>
</tr>
</tbody>
</table>
![UDP BitTorrent tracker throughput](./aquatic-udp-load-test-2024-02-10.png)

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