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In this paper, we present the High Energy Physics data format, processingtoolset and analysis library a4, providing fast I/O of structured data usingthe Google protocol buffer library. The overall goal of a4 is to providephysicists with tools to work efficiently with billions of events, providingnot only high speeds, but also automatic metadata handling, a set of UNIX-liketools to operate on a4 files, and powerful and fast histogramming capabilities.At present, a4 is an experimental project, but it has already been used by theauthors in preparing physics publications. We give an overview of theindividual modules of a4, provide examples of use, and supply a set of basicbenchmarks. We compare a4 read performance with the common practice of storingunstructured data in ROOT trees. For the common case of storing a variablenumber of floating-point numbers per event, speedups in read speed of up to afactor of six are observed.

The A4 project: physics data processing using the Google protocol buffer library