Signals

libVTcs uses the same techniques as fail-safe MPI tracing to handle failures inside the application, therefore it will generate a trace even if the application segfaults or is aborted with CTRL-C.

When only one process runs into a problem, then libVTcs tries to notify the other processes, which then should stop their normal work and enter trace file writing mode. If this fails and the application hangs, then it might still be possible to generate a trace by sending a SIGINT to all processes manually.

See Also

Tracing of Failing MPI Applications

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