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Tracing

Tracing applications allows developers to visually examine executions and can help detect performance anomalies. While nOS-V already supports generating lightweight traces through the ovni library, NODES can generate additional events that are combined with nOS-V traces.

To enable ovni tracing, both NODES and the underlying nOS-V runtime must be built with ovni support using the --with-ovni option, which should point to a valid ovni installation. Then, instrumentation must be enabled through:

    1. nOS-V's configuration
    1. NODES' configuration by setting the ovni.enabled=true option.

The resulting trace will be stored in the ovni/ directory and can be converted into a Paraver trace using the ovniemu utility. The Paraver configuration files (views) are available in the ovni/cfg directory.

See the ovni documentation for more details.