WebSocket Echo Load Generator
This simple application simulates load on a target with parallel connections. Each connection performs echo operations in a loop, in other works, it sends a message and expects to have the same message back, and then repeat.
It is possible to configure:
- The amount of connections.
- The delay between echo operations, if any.
- The message length.
- The frame length. This setting, together with the message length, allows to send a message split across multiple frames.
Also, it supports wss://.
The application uses System.Net.WebSockets.ClientWebSocket, so Windows 8/2012 is required to run it.
Usage
[Websocket URI] [ Client Amount ] [Message delay ms] [Message Byte Length] [Frame Byte Length]
For example, to simulate 1000 clients to ws://myserver.com/api/ws sending each messages of 512 bytes, and wait 100 milliseconds before starting the next echo operation it would be:
WebSocketEchoLoadGenerator ws://myserver.com/api/ws 1000 10 512 512
If you want to test the partial frames support, and want to send the message in two parts, indicate a smaller frame length:
WebSocketEchoLoadGenerator ws://myserver.com/api/ws 1000 100 512 256
If want to test maximum throughput just set the delay to 0:
WebSocketEchoLoadGenerator ws://myserver.com/api/ws 1000 0 512 256
Always keep an eye on your CPU usage and your network throughput, they may become the load generation bottleneck if you use high values.
Performance Counters
The application has three performance counters under the "WebSocket Echo Load Test" category:
- Echo Average Latency (seconds): The average latency in milliseconds of each echo operation.
- Echoes per second: The amount of echo operations succesfully done per second.
- Connected: The number of connected clients.