1. University of Wisconsin-Milwaukee
Excess power method: preparing for automated analysis of LIGO data for burst sources
Saikat Ray Majumder
&
Patrick Brady
University of Wisconsin-Milwaukee
DCC # G Z
12/1/2018
G Z LSC March-2004

2. Introduction…. Software
LAL
LALApps
The excess power code runs in a stand alone mode using Condor as the job manager.
Cluster
Medusa cluster at UWM
12/1/2018
G Z LSC March-2004

3. The different components……
The components of excess power search:
segwizard
LSCdataFind
lalapps_binj
lalapps_power
lalapps_bread
lalapps_burca
lalapps_binj_find
12/1/2018
G Z LSC March-2004

4. What do they do?
segwizard : produces a .txt file containing the list of segments to be analyzed.
LSCdataFind : fetches the information about the location of the data in the cluster.
lalapps_binj : [optional] If one wants to do software injections then this can be used to generate the parameter files. Output is in both xml & ASCII formats.
lalapps_power : the main search engine
12/1/2018
G Z LSC March-2004

5. What do they do? (contd.)
lalapps_bread : can read triggers from multiple xml files into a single xml file. The xml files should be listed in a .txt file.
lalapps_burca : [optional] looks for coincident events from two IFOs.
lalapps_binj_find : [optional] this looks for triggers corresponding to injected signals .
12/1/2018
G Z LSC March-2004

6. How do we stitch in all these different components? DAG
Directed Acyclic Graph
The programs are nodes in the graph, and the edges identify the dependencies.
12/1/2018
G Z LSC March-2004

7. DAG (contd.)
LSCdataFind
12/1/2018
G Z LSC March-2004

8. DAG lalapps_burca lalapps_burca LSCdataFind 12/1/2018
G Z LSC March-2004

9. DAG ( Contd.)
The DAG itself is defined by the contents of a DAGMan (Directed Acyclic Graph Manager) input file.
Hence one needs to write this DAGMan input file, specifying the list of programs in the DAG, their condor submit description files, dependencies in the DAG….
This file is submitted to the Condor.
DAGMan is then responsible for scheduling, recovery, and reporting for the set of programs submitted to Condor.
12/1/2018
G Z LSC March-2004

10. Some General Issues…
Technically one can include all the processes involved in the analysis in the DAG, but…..
that may not be the most efficient thing to do.
Our DAG includes:
LSCdataFind
lalapps_binj [optional]
lalapps_power
lalapps_ burca [optional]
12/1/2018
G Z LSC March-2004

11. Conclusion
So we are at a stage where we are almost ready to analyze the data in a completely automated way:
AS_Q data xml files containing
triggers
Immediate things to do:
Implement time shifted background estimation ( almost done )
Implement a correlation test in the pipeline
DAG
12/1/2018
G Z LSC March-2004