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Over the past decade, computational grids have become a popular com-puting platform for large-scale, resource-intensive applications. Several technologies have been developed and many infrastructures built across the globe to support the increasing number of such applications. How-ever, their strengths and weaknesses as well as their influence on ap-plications performance are not yet well known. There is not enough support for users to choose grids that match their needs nor for system architects and administrators to improve them so that user’s require-ments can be met. In this paper, we present Jawari, an open source, free of charge service which aims at providing means of benchmarking grids around the world in order to enable further analysis and comparisons.