The guys at Liverpool have been doing some very interesting performance testing of different RFIO READAHEAD buffer settings for the RFIO clients on their worker nodes. Using real ATLAS analysis jobs they have seen significant performance improvements when using large (i.e. 128MB) buffer sizes, both in terms of the total amount of data transferred during any job and the CPU efficiency.
http://northgrid-tech.blogspot.com/2008/12/rfio-tuning-for-atlas-analysis-jobs.html
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