100Gbps インスタンスの c5n.18xlarge を試してみる

# AWS に 100Gbps の新インスタンス出たそうなので・・・

自腹で試してみるって企画です。
2台立ち上げると、1時間で $7.76 が吹き飛びます。
Conoha の安い VPS が一か月使えますね。。。

## c5n ってどんなインスタンス？

こんなインスタンスですね。

|Instance Name|vCPUs|RAM     |EBS Bandwidth |Network Bandwidth|Hourly Price |
|:------------|:----|:-------|:-------------|:----------------|------------:|
|c5n.large    |2    |5.25 GiB|Up to 3.5 Gbps|Up to 25 Gbps    |0.108USD/h   |
|c5n.xlarge   |4    |10.5 GiB|Up to 3.5 Gbps|Up to 25 Gbps    |0.216USD/h   |
|c5n.2xlarge  |8    |21 GiB  |Up to 3.5 Gbps|Up to 25 Gbps    |0.432USD/h   |
|c5n.4xlarge  |16   |42 GiB  |3.5 Gbps      |Up to 25 Gbps    |0.864USD/h   |
|c5n.9xlarge  |36   |96 GiB  |7 Gbps        |50 Gbps          |1.944USD/h   |
|c5n.18xlarge |72   |192 GiB |14 Gbps       |100 Gbps         |3.888USD/h   |

## では、立ち上げ。

東京リージョンにはまだ来てないので、バージニアでいってみます。

![aws_c5n_001.png](https://qiita-image-store.s3.amazonaws.com/0/318450/086a06f8-4af6-b85d-bcf6-2631cc9aafe4.png)

ドキドキです（そんなピュアな年齢でもない・・・）

セキュリティとかは相互通信できる程度に開けて、後は、デフォルト使う感じで適当です。

## ちょっと見てみる

![aws_c5n_002.png](https://qiita-image-store.s3.amazonaws.com/0/318450/00705642-abd7-9541-5b80-672ed18178a5.png)

72個も CPU 並んでるの初めて見ましたよ。
総計、144個ですよｗ
壮観です。

メモリも桁入りきってないですね。
ちなみに `free` 叩くとこんな感じです。

```
# free
              total        used        free      shared  buff/cache   available
Mem:      193694504      489280   192512544         640      692680   191945800
Swap:             0           0           0
```

## では、速度測っていきましょう

おなじみの `iperf` 使っていきます。
一台をサーバモード（`iperf -s`）で上げて、もう一台をクライアントでいきます。
一応、両方からやってみたので、どちらも載せてみます。

Server: 172.31.87.76
Client: 172.31.86.97

```
# iperf -c 172.31.87.76 -t 60 -i 1
------------------------------------------------------------
Client connecting to 172.31.87.76, TCP port 5001
TCP window size:  325 KByte (default)
------------------------------------------------------------
[  3] local 172.31.86.97 port 41978 connected with 172.31.87.76 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 1.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3]  1.0- 2.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3]  2.0- 3.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3]  3.0- 4.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3]  4.0- 5.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3]  5.0- 6.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3]  6.0- 7.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3]  7.0- 8.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3]  8.0- 9.0 sec  1.10 GBytes  9.42 Gbits/sec
[  3]  9.0-10.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 10.0-11.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 11.0-12.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 12.0-13.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 13.0-14.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 14.0-15.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 15.0-16.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 16.0-17.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 17.0-18.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 18.0-19.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 19.0-20.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 20.0-21.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 21.0-22.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 22.0-23.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 23.0-24.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 24.0-25.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 25.0-26.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 26.0-27.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 27.0-28.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 28.0-29.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 29.0-30.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 30.0-31.0 sec  1.10 GBytes  9.41 Gbits/sec
[  3] 31.0-32.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 32.0-33.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 33.0-34.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 34.0-35.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 35.0-36.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 36.0-37.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 37.0-38.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 38.0-39.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 39.0-40.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 40.0-41.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 41.0-42.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 42.0-43.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 43.0-44.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 44.0-45.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 45.0-46.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 46.0-47.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 47.0-48.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 48.0-49.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 49.0-50.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 50.0-51.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 51.0-52.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 52.0-53.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 53.0-54.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 54.0-55.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 55.0-56.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 56.0-57.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 57.0-58.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 58.0-59.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 59.0-60.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3]  0.0-60.0 sec  66.0 GBytes  9.45 Gbits/sec
```

Server: 172.31.86.97
Client: 172.31.87.76

```
# iperf -c 172.31.86.97 -t 60 -i 1
------------------------------------------------------------
Client connecting to 172.31.86.97, TCP port 5001
TCP window size:  325 KByte (default)
------------------------------------------------------------
[  3] local 172.31.87.76 port 33876 connected with 172.31.86.97 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 1.0 sec  1.10 GBytes  9.47 Gbits/sec
[  3]  1.0- 2.0 sec  1.10 GBytes  9.41 Gbits/sec
[  3]  2.0- 3.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3]  3.0- 4.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3]  4.0- 5.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3]  5.0- 6.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3]  6.0- 7.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3]  7.0- 8.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3]  8.0- 9.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3]  9.0-10.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 10.0-11.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 11.0-12.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 12.0-13.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 13.0-14.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 14.0-15.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 15.0-16.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 16.0-17.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 17.0-18.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 18.0-19.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 19.0-20.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 20.0-21.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 21.0-22.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 22.0-23.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 23.0-24.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 24.0-25.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 25.0-26.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 26.0-27.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 27.0-28.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 28.0-29.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 29.0-30.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 30.0-31.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 31.0-32.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 32.0-33.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 33.0-34.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 34.0-35.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 35.0-36.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 36.0-37.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 37.0-38.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 38.0-39.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 39.0-40.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 40.0-41.0 sec  1.10 GBytes  9.42 Gbits/sec
[  3] 41.0-42.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 42.0-43.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 43.0-44.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 44.0-45.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 45.0-46.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 46.0-47.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 47.0-48.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 48.0-49.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 49.0-50.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 50.0-51.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 51.0-52.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 52.0-53.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 53.0-54.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 54.0-55.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 55.0-56.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 56.0-57.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3] 57.0-58.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 58.0-59.0 sec  1.10 GBytes  9.46 Gbits/sec
[  3] 59.0-60.0 sec  1.10 GBytes  9.45 Gbits/sec
[  3]  0.0-60.0 sec  66.0 GBytes  9.45 Gbits/sec
```

あれ？ 100Gbps 回線といいつつ、実態は 9.45Gbps くらいしか出てないですね・・・
一応、1秒単位とかでないデフォルトの10秒のやつでもやって結果は同じでした。
確かに、秒間 1Gバイトが飛んでるってすごいですけど。

## おまけで、スピードテストもやってみた

```
[root@ip-172-31-87-76 ~]# speedtest
Retrieving speedtest.net configuration...
Testing from Amazon.com (52.91.71.175)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Sneaker Server (Ashburn, VA) [1.39 km]: 3.878 ms
Testing download speed................................................................................
Download: 4792.82 Mbit/s
Testing upload speed................................................................................................
Upload: 1590.16 Mbit/s
```

```
[root@ip-172-31-86-97 ~]# speedtest
Retrieving speedtest.net configuration...
Testing from Amazon (54.158.69.243)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Sneaker Server (Ashburn, VA) [1.39 km]: 3.375 ms
Testing download speed................................................................................
Download: 2651.47 Mbit/s
Testing upload speed................................................................................................
Upload: 1317.60 Mbit/s
```

5Gbps 近く出ているので、計測サーバ側も相当速いやつですね。。。

## まとめ

なんか、100Gbps というので期待してみたのですが、実態的には 1/10 くらいなんでしょうかね。
そのうち時間とお金の余裕があるときにまた試したいと思います。
まぁ、それでも速いことには変わりないので、潤沢にお金ある人は使ってみるといいかもしれません。
そんな回線でも、日本から SSH 接続すると、もっさり感はあるので、経路の問題は難しいですね。