Stellar Astrophysics and in particular stellar evolutionary computations are extremely important to face a wealth of astrophysical problems, but they are also extremely demanding in terms of computing power and data storage. The Bag of Stellar Tracks and Isochrones (BaSTI) database is a theoretical astrophysical catalogue that collects fundamental data sets involving stars formation and evolution. To create this database it is necessary to run a large number of stellar evolutionary computations. The Grid technology seems to be a promising answer to data storage and processing needs of the BaSTI catalogue. In the framework of the EGEE Grid infrastructure, we managed to run a number of experiments aimed at designing and defining an application specific environment for the stellar simulation software and its interaction with the BaSTI database. Our successful implementation demonstrates that the “gridification” of stellar evolution code is not only possible but also even extremely convenient in terms of data processing speed and data sharing, and it can be a valuable instrument to support Astrophysical research.

Grid and Databases: BaSTI as a Practical Integration Example

Using hybrid GPU/CPU kernel splitting to accelerate spherical convolutions

VObs.it, the Italian contribution to the international Virtual Observatory—History, activities, strategy

/pdf/distributing-solar-data-minimizing-wasted-bandwidth-1nz9x4dzmy.pdf

Distributing Solar Data: Minimizing Wasted Bandwidth

We present a general method for accelerating by more than an order of magnitude the convolution of pixelated functions on the sphere with a radially-symmetric kernel. Our method splits the kernel into a compact real-space component and a compact spherical harmonic space component. These components can then be convolved in parallel using an inexpensive commodity GPU and a CPU. We provide models for the computational cost of both real-space and Fourier space convolutions and an estimate for the approximation error. Using these models we can determine the optimum split that minimizes the wall clock time for the convolution while satisfying the desired error bounds. We apply this technique to the problem of simulating a cosmic microwave background (CMB) anisotropy sky map at the resolution typical of the high resolution maps produced by the Planck mission. For the main Planck CMB science channels we achieve a speedup of over a factor of ten, assuming an acceptable fractional rms error of order 1.e-5 in the power spectrum of the output map.

Managing Astronomical Data in the Grid through CFITSIO

Simulating the Planck Mission on a Distributed Computing Architecture: The DEISA and EGEE Experiences

We present the prototype of the new BaSTI web portal This portal is a GRID and Virtual Observatory integrated facility that allows to exploit the computational and storage capabilities of the EGEE-II GRID environment from a Virtual Observatory compliant web portal This facility provides data access to large sets of stellar evolution models, it is also able to create on-the-fly models submitting a large number of jobs on the GRID and collecting the results This portal is a first example of a service that is able to bridge two different GRID environments: the Virtual Observatory and the EGEE-II computational and data GRID

BaSTI: the Virtual Observatory meets the Computational Grid

The term ”grid” in the Virtual Observatory context has mainly been used to indicate a set of interoperable services. This is rather different from the approach other scientific communities are taking mainly based on using the grid for computational tasks. Within this framework, it appears as extremely important to interconnect the Virtual Observatory and the computational grid infrastructures. Harmonisation of the Virtual Observatory infrastructure and user tools with the developments being carried out within the various national and European grid projects is an important goal to achieve. We present the point of view of followed in the framework of the EuroVO Data Centre Alliance project, that we will propose to the International Virtual Observatory Alliance as a successful example of interoperability.

/pdf/making-the-grid-and-the-virtual-observatory-interoperable-4mr4tnyco8.pdf

Making the Grid and the Virtual Observatory interoperable .

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Managing Astronomical Data in the Grid through CFITSIO

Simulating the Planck Mission on a Distributed Computing Architecture: The DEISA and EGEE Experiences

BaSTI: the Virtual Observatory meets the Computational Grid

Making the Grid and the Virtual Observatory interoperable .