Xdd is a command-line based tool for measuring and characterizing disk subsystem I/O on single systems and clusters of systems. It is designed to provide consistent and reproducible performance measurements of disk I/O traffic. This repo has 6.2a which is really old an obsolete.
The name XDD is trademarked and belongs to
I/O Performance, Inc. (http://www.ioperformance.com/)
See the github account of the fine folks at ORNL for a more recent version (https://github.com/ORNL/xdd). It may still not be the most recent version because that is how Tom rolls ;-)
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