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Overview
The objective of the ovni project is to provide insight into what happened at execution of a program.
The key pieces of software involved are instrumented so they emit events during the execution which allow the reconstruction of the execution later on.
During the execution phase, the information gathered in the events is kept very short and simple, so the overhead is kept at minimum to avoid disturbing the execution process. Here is an example of a single event emitted during the execution phase, informing the current thread to finish the execution:
00 4f 48 65 52 c0 27 b4 d3 ec 01 00
During the emulation phase, the events are read and processed in the emulator, reconstructing the execution. State transitions are recorded in a Paraver trace. Here is an example of the same thread ceasing the execution:
2:0:1:1:1:50105669:1:0
Finally, loading the trace in the Paraver program, we can generate a timeline visualization of the state change. Here is the example for the same state transition of the thread stopping the execution:
