HTCondor is more than just a batch system! It has a number of special features that make it an invaluable part in the infrastructure of the Open Science Grid. In this talk I will explore periodic execution, classads and the collector, the job router, the master, and provide an overview of how these are used to solve various technical challenges in the OSG.

In this tutorial, we will focus on how to model scientific analysis as a workflow, that can be executed on the UW Madison CHTC cluster using Pegasus WMS (http://pegasus.isi.edu ) . Pegasus allows users to design workflows at a high-level of abstraction, that is independent of the resources available to execute them and the location of data and executables. It compiles these abstract workflows to executable workflows that can be deployed onto distributed resources such local campus clusters, computational clouds and grids such as XSEDE and Open Science Grid. Through hands-on exercises (https://pegasus.isi.edu/tutorial/chtc15/index.php ), we will cover issues of workflow composition, how to design a workflow in a portable way, workflow execution and how to run the workflow efficiently and reliably. An important component of the tutorial will be how to monitor, debug and analyze workflows using Pegasus-provided tools.