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The basic task of the skimmer is to take Glast ROOT files, containing ROOT trees, and produce similar output files with a subset of branches and events. The search for ROOT data files to be skimmed is called here mining. The eventual non-copy of some branches is called pruning. The copy of only a subset of events is called filtering cutting.
The behavior of the skimmer is all tuned by some predefined shell variables. For a complete list of those variables, one can type "skimmer help", but the explanations will hardly make sense if you have not read this guide before.
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SK_INPUT_LIBRARY_LIST="" SK_EXPECTED_RELEASE="" SK_LIBRARY_DIRS=""/nfs/farm/g/glast/u09/builds/rh9_gcc32:/nfs/farm/g/glast/u30/builds/rh9_gcc32:/afs/slac.stanford.edu/g/glast/ground/releases/rh9_gcc32opt" SK_OUTPUT_LIBRARY_LIST="" SK_DEBUG_LIBRARY_LIST="false" |
Events
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cutting parameters
The list of selected events can be obtained from different sources :
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In the case you do want to keep all the entries, i.e. to merge the input data files, you should not give any kind of filter cut to the skimmer : SK_INPUT_CEL, SK_INPUT_EVENT_LIST and SK_TCUT should be empty.
In theory, we should also be able to combine any number of those filters cuts above, but this is not yet implemented. Currently, you must define either an input CEL, or a textual file, or a cut. Also, it is not yet possible to define a TCut which is going through several data types, but it will be studied as soon as we have several possible values for SK_TCUT_DATA_TYPE.
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