F# WebSocket Server

High-performance, idiomatic, zero-dependency, Async-based, WebSocket server with supervision and ticker in 200 LOC.

Build

$ dotnet build ws.fsproj

Run

$ bin/Debug/net5.0/ws
N2O/F# WebSocket Server 1.0
[smp] [cpu:4] [io:4]

Connect

$ wscat -c 127.0.0.1:1900/n2o
connected (press CTRL+C to quit)
> ECHO
< ECHO

Benchmark

$ tcpkali -c4 --ws --message "PING" \
  --latency-first-byte -r50m 127.0.0.1:1900/n2o \
  --latency-percentiles 50,100

MacBook Air 2018

Total data sent:     15.6 MiB (16390020 bytes)
Total data received: 8.3 MiB (8721138 bytes)
Bandwidth per channel: 10.038⇅ Mbps (1254.8 kBps)
Aggregate bandwidth: 6.973↓, 13.104↑ Mbps
Packet rate estimate: 70377.7↓, 1141.7↑ (1↓, 17↑ TCP MSS/op)
First byte latency at percentiles: 32.5/46.0 ms (50/100%)
Test duration: 10.006 s.

Notes

• 2021-01-04 F# WebSocket Server

Credits

• Igor Gorodetsky
• Maxim Sokhatsky
• Siegmentation Fault