45 lines
1.7 KiB
Markdown
45 lines
1.7 KiB
Markdown
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This is the documentation of ovni, the Obtuse (but Versatile) Nanoscale
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Instrumentation project.
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!!! Note
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Preferably write the name of the project as lowercase *ovni*
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unless the grammar rules suggest otherwise, such as when
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starting a new sentence.
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The ovni project implements a fast instrumentation library that records
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small events (starting at 12 bytes) during the execution of programs to
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later investigate how the execution happened.
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The instrumentation process is split in two stages:
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[runtime](user/runtime/index.md)
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tracing and [emulation](user/emulation/index.md).
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During runtime, very short binary events are stored on disk which
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describe what is happening. Once the execution finishes, the events are
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read and processed to reproduce the execution during the emulation
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process, and the final execution trace is generated.
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By splitting the runtime and emulation processes we can perform
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expensive computations during the trace generation without disturbing
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the runtime process.
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Each event belongs to a model, which has a direct mapping to a target
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library or program. Each model is independent of other models, and they
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can be instrumented concurrently.
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## Quick start
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To start a trace follow these steps:
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- First enable the instrumentation of those libraries or programs that
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you are interested in (see their documentation).
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- Then simply run the program normally. You will see a new `ovni`
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directory containing the runtime trace.
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- Finally run the `ovniemu ovni` command to generate the Paraver traces.
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- Use the command `wxparaver ovni/cpu.prv` to load the CPU trace.
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- Load the configurations from the `ovni/cfg/` directory that you are
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interested in, to open a timeline view.
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