Introduction to the WS-PGRADE/gUSE Science Gateway Framework - Science Gateways for Distributed Computing Infrastructures - page 26

Fig. 2.5 The main elements of the con guration phase in WS-PGRADE

2.5.2.3 The Submitting Phase: Work ow Execution

After all the properties of the work ow have been set, it can be submitted, resulting

in an instance of the work ow can be submitted several times

(for example, in case of performance measurements), and every submission results
in a new instance of the same concrete work

ow. A concrete work

ow.

ow instance is data driven. The order of execution is
forced by the graph structure: a node is activated (the associated job is submitted or
the associated service is called) when the required input data elements (usually a

The execution of a work

files) become available at every input port of the node. This node
execution is represented as the instance of the created job or service call. One node
can be activated with several input sets, and each activation results in a new job or
service call instance. The job or service call instances also contain status infor-
mation and in the case of successful termination the results of the calculation are
represented in the form of data entities associated to the output ports of the cor-
responding node.
A typical submission scenario contains three main parts (Fig. 2.6 ): starting and
monitoring the submission as well as obtaining the submission result:

file, or a set of

1. A work ow submission can be started by clicking on the Submit button.

2. Monitoring and observing the submission: the progress of work ow instance

submission can be checked by the Details function. The result is the list of the