The search for continuous sources in the Virgo experiment. Full-sky incoherent step: 'local' and 'grid' tests

The full-sky incoherent step is the most computationally heavy in the hierarchical procedure developed in the search for continuous gravitational signals in the data of the Virgo detector. This step is based on the Hough transform. We have implemented it by means of an approach that uses look-up tables. Here, after a short introduction to the whole data analysis method, we describe the implementation of the Hough transform and discuss the performances of the code. Then, we discuss the computing framework in which data analysis will be performed. In particular, we briefly describe the architecture of the European DataGrid software, which we have used to deploy a small computational 'grid'. In this 'grid' environment we have tested our code and the results are shown.