Speaker
C. Jones
(CORNELL UNIVERSITY)
Description
A common task for a reconstruction/analysis system is to be able to
output different sets of events to different permanent data stores
(e.g. files). This allows multiple related logical jobs to be grouped
into one process and run using the same input data (read from a
permanent data store and/or created from an algorithm). In our
system, physicists can specify multiple output 'paths', where
each path contains a group of filters followed by output 'operations'.
The filters are combined using a physicist specified boolean
expression; only if the expression evaluates to true will the output
operation be performed for that event.
Paths do not explicitly contain the order that data objects should be
created as our system uses a 'data on demand' mechanism which causes
data to be created the first time the data is requested. Separating
the data dependencies from the event selection criteria vastly
simplifies the task of creating a path, thereby making the facility
more accessible to physicists.
Primary author
C. Jones
(CORNELL UNIVERSITY)
