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There are three different ways to get quasi real time information about data taking. They offer different pros and cons and the final choice to decide about which method works best for a given experiments is left to the users.

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This method allows to run the analysis by reading the detector data from a fast, dedicated storage layer (FFB), called fast feedback, dedicated to the running experiment. Any framework which can read XTC files can be adopted to run as fast feedback application. The most common framework used with this method is psana.

Pros: trivial to setup; independent from the DAQ; ability to run the same code online and offline. Cons: not quite real time (< 10s); may compete with the HDF5 translator if the translation services are run against the FFB storage layer.

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