Troubleshooting

tokio-console support and configuration

tokio-console is a tool that is commonly used to monitor and debug async rust applications built with the tokio runtime. Support for tokio-console can be enabled similar to how you would add a logging appender. The following entry in the config.toml file will add a tokio-console appender to the logging configuration:

[tokio_console] # This is the name of the appender, choose any name you like
kind = "TokioConsole" # Note that this is case-sensitive
bind = "127.0.0.1:5674" # Optional field to specify the server address for the tokio-console server

In order to collect task data from the tokio runtime, you also need to enable the tokio_unstable cfg. For example, you can run the placement center with the following command along with the above configuration to enable tokio-console support:

RUSTFLAGS="--cfg tokio_unstable" cargo run --package cmd --bin placement-center

You can then use the following command to launch the tokio-console client to connect to the server listening on the custom address:

tokio-console http://127.0.1:5674