Administrator Guide

Appendix B Benchmark command reference
31 Dell EMC Ready Solutions for HPC BeeGFS High Capacity Storage | ID 424
B.2 MDtest: Metadata file operations
We used the following command to run metadata tests, the results of which are recorded in the performance
evaluation section of this paper.
mpirun --allow-run-as-root -machinefile $hostlist --map-by node -np $threads
$mdtest -v -d $working_dir -i ${repetitions} -b $nd -z 1 -L -I $nf -y -u -t -F
The following table describes the MDtest command line options:
MDtest command line options
Option
Description
-d
Directory in which the tests will run
-v
Verbosity (each instance of option increments by one)
-i
Number of iterations that the test will run
-b
Branching factor, how many directories to create, used in conjunction
with -z
-z
Depth of hierarchical directory structure
-L
Files only at leaf level of tree
-I
Number of files to create per directory
-y
Sync file after writing
-u
Unique working directory for each task
-t
Time unique working directory overhead
-F
Perform test on files only (no directories)
B.3 IOR N-1 xequential IO
We used the following command to run the IOR N-1 performance tests, which are recorded in the
performance evaluation section of this paper:
mpirun –-allow-run-as-root -machinefile $hostlist --map-by node -np $threads
~/bin/ior -w -r -i 3 -t 8m -b $file_size -g -d 3 -e -E -k -o
$working_dir/ior.out -s 1
The following table describes the IOR command line options:
IOR command line options
Component
Specification
-g
intraTestBarriers—use barriers between open, write/read, and close
-d
interTestDelay—delay between reps in seconds