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Collectl is a light-weight performance monitoring tool capable of reporting interactively as well as logging to disk. It reports statistics on cpu, disk, infiniband, lustre, memory, network, nfs, process, quadrics, slabs and more in easy to read format.

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Default behavior is summary format for cpu, disk and network Here we see each different types of interrupts by CPU Add msec to see sub-second intervals & look at other data Verbose mode shows more detail than summary data Add time to default display at expense of 9 more columns Detail formats allow one to look at individual instances

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