WS-PGRADE/gUSE in European Projects - Science Gateways for Distributed Computing Infrastructures - page 235

Development of HPC work fl ows : This activity successfully tested the support
from WS-PGRADE for a number of job-submission middleware tools, enabling the
communication between the science gateway and the VERCE HPC computational
resources. Though, the current setup is mostly based on GT5 resources.
Integration of the VERCE scienti c application : Of great signi

cance for us was
the potential to design and develop our own customized applications, delegating the
submission of the workflow and the control of the middleware to the WS-PGRADE
framework. Effort was focused on the development of the front-end and the
implementation of the workflow, instrumenting the control of the middleware via
the ASM API. The support of the gUSE team was very helpful to ease our learning,
including fostering their implementation of new ASM functionalities, such as being
able to programmatically change a workflow ' s job properties.

17.3.3 Gateway Services Implementation

In this section we provide a detailed overview on the progress achieved with the
development of the VERCE gateway. It particularly concerns the forward modeling
tool, which is the target of the first beta release of the gateway. The platform was

used for realistic scenarios, demonstrating the feasibility of controlling large-scale
computations, producing thousands of data products and related metadata across the
EGI and PRACE resources hosted at LRZ.

17.3.3.1 Forward Modeling

Figure 17.3 illustrates the overall architecture of the application, indicating the
components and the user-interaction flow. The GUI will guide a user towards the
complete de input data, determining automatically the geo-

graphical boundaries of their experiments, as shown in Fig. 17.4 . The functional-
ities of the tool can be grouped under four main categories.
Simulation code selection and con

nition of their runs '

guration: The waveform simulation software
can be selected from a list of available codes already deployed within the VERCE
computational resources. The GUI allows selection of a solver, con guration of its

input parameters and a choice from a set of meshes and velocity models.
Earthquakes and stations selection: Earthquakes and stations can be searched,
visualized and selected in two different modes. The users can choose either to
upload their own

files, or to directly query the International Federation of Digital
Seismograph Networks (FDSN) web services. All of the relevant parameters are
presented to the user in both tabular and graphical form. An interactive map shows
the earthquakes and station data in combination with other geographical layers of
interest, such as geological information, hazard levels, seismic faults, etc. They are
published by other projects such as OneGeology and European facility for earth-
quake hazard and risk (EFEHR).