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

IGI – the Association for the Italian Grid Infrastructure – has been established as a consortium of 14 different national institutions to provide long term sustainability to the Italian Grid. Its formal predecessor, the Grid.it project, has come to a close in 2006; to extend the benefits of this project, IGI has taken over and acts as the national coordinator for the different sectors of the Italian e-Infrastructure present in EGEE. IGI plans to support activities in a vast range of scientificdisciplines – e.g. Physics, Astrophysics, Biology, Health, Chemistry, Geophysics, Economy, Finance – and any possible extensions to other sectors such as Civil Protection, e-Learning, dissemination in Universities and secondary schools. Among these, the Astrophysics community is active as a user, by porting applications of various kinds, but also as a resource provider in terms of computing power and storage, and as middleware developer.

/pdf/igi-the-italian-grid-initiative-and-its-impact-on-the-3wqbwqd524.pdf

IGI (the Italian Grid initiative) and its impact on the Astrophysics community

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Papers

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

IGI (the Italian Grid initiative) and its impact on the Astrophysics community