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The MDtest benchmark was used to measure Metadata Create, Stat and Removal operations. The following table provides definitions for some of the terms that are used in this document. You can download MDtest from https://github.com/hpc/ior/releases. Version 3.3.0 was used in these tests. It was compiled and installed on each client to make it accessible. MDtest is used with mpirun. For these tests, OpenMPI version 4.0.4rc3-1.51237 was used, which was included with the Mellanox OFED used on the clients, and then copied on the servers and made the selected version, to have a consistent configuration. The following table describes the MDtest command-line arguments.
mpirun Argument |
Description |
-np |
Number of concurrent processes |
--map-by node |
Instructs mpirun allocate cores from nodes in a round robin fashion (one per node each time) to distribute evenly the threads among all nodes |
--allow-run-as-root |
Allow mpirun to run when executed by the root user |
--hostfile |
Tells mpirun where the hostfile is located |