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It was the kernel. We were using 2.6.32, which is quite old, but it is the one supported by Red Hat EL and Scientific Linux. Today I had lunch with a friend (Giuseppe Ottaviano) who had a similar experience tuning high-performance indexing algorithms. After upgrading to the newest version everything (compiler, libraries, etc.) he changed the kernel to the ...


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Regarding the txt file, it all seems "normal" for all computers... low await (disk latency), rather lower (=better) for the "bad" computers... request queue not too bad, 0 wa (IO wait time in vmstat). But you went from 5MB/30sec to 130 MB/sec, what's up?



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