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NOTE: in addition to the hdf5 you specify as your output file ("my.h5" below) you will see other h5 files like "my_part0.h5", one for each of the cores specified in PS_SRV_NODES.  The reason for this is that each of those SRV cores writes its own my_partN.h5 file: for LCLS2 it will be important for performance to write many files.  The "my.h5" file is actually quite small, and uses a new HDF5 feature called a "Virtual DataSet" (VDS) to join together the various my_partN.h5 files.  Also note that events in my.h5 will not be in time order.  If you copy the .h5 somewhere else, you need to copy all of them.

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