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Di Matteo, P., Capuzzo Dolcetta, R., Miocchi, P., Antonuccio-Delogu, V., Becciani, U., Costa, A., & Rosato, V. 2003, in ASP Conf. Ser., Vol. 295 Astronomical Data Analysis Software and Systems XII, eds. H. E. Payne, R. I. Jedrzejewski, & R. N.
Hook (San Francisco: ASP), 17
Astrocomp: A Web Portal for High Performance Computing on a Grid of Supercomputers
P. Di Matteo, R. Capuzzo Dolcetta, P. Miocchi
Dipartimento di Fisica, Universitá di Roma ``La Sapienza,'' P.le Aldo Moro 2, 00185 Roma, Italy
V. Antonuccio-Delogu, U. Becciani, A. Costa
Osservatorio Astrofisico di Catania, Cittá Universitaria, Via Santa Sofia 78, 95123 Catania, Italy
V. Rosato1
ENEA, Casaccia Research Center, Computing and Modelling Unit (CAMO), P.O. Box 2400 Roma, Italy
Abstract:
Astrocomp is a project based on a collaboration among the University
of Roma La Sapienza, the Astrophysical Observatory of Catania and ENEA.
The main motivation of the AstroComp project is to construct a portal,
which allows to set up a repository of computational codes and common
databases, making them available and enjoyable, with a user-friendly
graphical web interface, to the international community. AstroComp will
allow the scientific community to benefit by the use of many different
numerical tools implemented on high performance computing (HPC) resources,
both for theoretical astrophysics and cosmology and for the storage and
analysis of astronomical data, without the need of specific training,
know-how and experience either in computational techniques or in database
construction and management methods. An essential feature of Astrocomp
is that it makes available to subscribers some CPU time on large parallel
platforms, via specific grants. Astrocomp is partly financed by a grant
of the Italian national research Council (CNR).
The main aim of the AstroComp project is to create a portal that provides
both astrophysical numerical codes and platforms to run them, with no need
by the user to get grants or to pay expensive computational resources.
A prototype of the AstroComp portal is already working and can be visited
at http://www.astrocomp.it
(see Figure 1), where it is
possible to find a description of the main features of the project.
Figure 1:
Home page of the present version of the AstroComp web portal.
 |
Clicking on the Software session, it is possible to find a
description of the codes that are presently available through the portal.
At the present stage, AstroComp hosts three N-body codes:
- the ATD treecode, a parallel tree-code for the simulation
of the dynamics of self-gravitating systems (Miocchi & Capuzzo Dolcetta
2002);
- the FLY code, a cosmological code for studying
three-dimensional collisionless self-gravitating systems with periodic
boundary conditions (Becciani & Antonuccio-Delogu 2001); and
- the HSNbody, a direct-summation code which is presently
under implementation into the portal (Di Matteo, 2001).
ATD and FLY have been already tested and are fully
working on the server. The main features of the platforms now available
to run these codes can be found clicking on the Hardware session,
from the AstroComp home page. At the moment, the portal can provide four
machines: an IBM SP4 and a SGI Origin 3800 (both located at CINECA),
a Linux Alpha Cluster (located at ENEA Casaccia Research Center) and an
IBM SP3 (located at the Catania Astrophysical Observatory).
Anyone who wants to use the provided facilities has to register first,
doing the following steps:
- click on the Registration Form, available from the AstroComp
home page and fill the form, entering personal data and e-mail address; and
- wait for a confirmation e-mail sent quickly by the portal
administrator as soon as the account is added for the new user, with
the username and password he will have to use to enter in the User
Area.
Clicking on the User Area button, after a usual login procedure,
any registered user can have the access to the computational facilities
of the AstroComp portal.
At present, an AstroComp user is able to:
- start a new simulation by choosing which code to run
and by determining the simulation parameters via the Parameters
on line form; and
- choose among different platforms from the pool of the available resources;
or
- browse the status of a previously launched job, possibly checking
the intermediate results with a preliminary ``on-the-fly'' visualization
tool available in the portal itself (see Figure 2); then
- download the final and/or intermediate results.
Figure 2:
The 2-D plot page available from the AstroComp portal.
 |
In the first case, if the user wants to start a new simulation, after
the code he wants to run has been chosen, he has to assign the parameters
of his own simulation. Two possibilities are available: the user can choose
either to use the AstroComp default values (described in the New
Job session) or to give his own parameters. After having entered all
these parameters, a name can be given to the job. The last step to do,
before submitting the job, is to give the initial configuration files.
Also in this case it is possible to choose either to use the AstroComp
default files or to assign others.
If the user wants to check the status of a previously launched job, he
has to click on the Job Status button (in the User Area
page). Here he will find the list of the submitted jobs, the dates of
the submissions, the job status (pending, not in queue or running) and
the platform used to run it. Clicking on the Results button
from this list, it is possible to see the list of the files produced by
the simulation.
The user can choose either to delete files (in this case he will lose
them definitely) or to plot them, using a visualization tool available
on the portal itself. Plotting the files could be
useful to check the simulation results.
Many improvement are planned to be carried out in the short-term activity.
They include:
- implementation of on-line tools for the automatic generation of the
most used and relevant initial conditions for astrophysical/cosmological
simulations;
- implementation of scheduling methods for the management
of very-long term simulations by subdividing them in shorter
``sub-simulations'' that could satisfy the CPU times restrictions of
the various queue job systems; and
- inclusion of advanced data analysis and storage tools (for
example, AstroMD,
Becciani et al. 2000).
To conclude, note that the AstroComp server is based on a PHP/MYSQL
environment and that the databases structure has been designed with the
capability of an easy interface with the middleware and the Resource
Broker for a future grid-based computational environment.
Anyone who is interested on this project and wants to add
astrophysical codes to the portal can contact us, sending an e-mail
to one of the AstroComp members (e-mail addresses are available
in the AstroComp Members
page).
References
Becciani, U. & Antonuccio-Delogu, V. 2001, Comp. Phys. Comm., in press (astroph/0101148)
Becciani, U., Antonuccio-Delogu, V., Gheller, C.,
Calori, L., Buonomo, F. & Imboden, S. 2000, IEEE CG&A, submitted
(astroph/0006402)
Di Matteo, P. 2001, Graduation Thesis, Univ. of Rome ``La
Sapienza,'' Italy
Miocchi, P. & Capuzzo Dolcetta, R. 2002, A&A, 382, 758
Footnotes
- ... Rosato1
- INFM Unitá di Ricerca Roma I
© Copyright 2003 Astronomical Society of the Pacific, 390 Ashton Avenue, San Francisco, California 94112, USA
Next: Architecture for All-Sky Browsing of Astronomical Datasets
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Previous: eSTAR: Building an Observational GRID
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