出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The computing system of the CMS experiment works using distributed resources from more than
60 computing centres worldwide. These centres, located in Europe, America and Asia are interconnected
by theWorldwide LHC Computing Grid. The operation of the system requires a stable
and reliable behaviour of the underlying infrastructure. CMS has established a procedure to extensively
test all relevant aspects of a Grid site, such as the ability to efciently use their network
to transfer data, the functionality of all the site services relevant for CMS and the capability to
sustain the various CMS computing workows (Monte Carlo simulation, event reprocessing and
skimming, data analysis) at the required scale. This contribution describes in detail the procedure
to rate CMS sites depending on their performance, including the complete automation of the program,
the description of monitoring tools, and its impact in improving the overall reliability of
the Grid from the point of view of the CMS computing system.
