[Halld-offline] Viewing DEPICSvalue with hd_dump

David Lawrence davidl at jlab.org
Thu Apr 21 17:11:08 EDT 2016

Hi All,

  I just pushed a change to github that finishes off a feature that allows one to map events
in an EVIO file before starting to process them. This is mainly useful for looking at EPICS
events which are often hard to see since they are buried in a sea of physics events.

With this new feature, simply asking hd_dump to print DEPICSvalue objects will trigger
mapping of the EVIO. The first time this is run, it can take a couple of minutes, but subsequent
times can take only seconds if the key inodes are still cached. If trying to look at EPICS
events with hd_dump, one should invoke it this way:

> hd_dump -DDEPICSvalue file.evio

Note that it will automatically turn on the “-f” and “-s” options now if the only object requested
is DEPICSvalue

Please let me know if you see any issues.


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