APEL: An implementation of Grid accounting using R-GMA. This article describes the implementation of an accounting tool in the LHC Computing Grid (LCG): a distributed computing grid project consisting of over 100 resource centres and more than 10,000 CPUs. APEL (Accounting Processor for Event Logs) parses batch, system and gatekeeper logs generated by a site and builds accounting records, which provide a summary of the resources consumed based on attributes such as CPU time, Wall Clock Time, Memory and grid user DN. The accounting data is published into the R-GMA information and monitoring system, and archived for processing by a graphical front-end utilised by the accounting web tool.

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