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At high rates ami2 creates “batches” of events for processing (more efficient) but this gets sluggish when running low-rate experiments (e.g. 1Hz) because ami waits for the batch to end (defined by the heartbeat interval) before forwarding the batch through the pipeline.  To address this issue Dan Damiani has added the ability to put ami in a “prompt” mode which effectively sets the batch size to 1.  It is set on the worker cores ami collector process with the "-d=1" flag (depth of heartbeat event-builder buffer).  This flag will cause ami to be more responsive at low rates, but function less efficiently at high rates.

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