The following command is an example to run the IOR N-1 performance tests:
mpirun --allow-run-as-root -np $Threads --hostfile my_hosts.$Threads --mca btl_openib_allow_ib 1 --mca pml ^ucx --oversubscribe --prefix /usr/mpi/gcc/openmpi-4.1.2a1 /usr/local/bin/ior -a POSIX -v -i 3 -d 3 -e -k -o /mmfs1/perftest/ior/tst.file -w -r -g -s 1 -t 16m -b ${FileSize}G
The following table describes the IOR command-line options typically used:
Table 14. IOR command-line options
-g | intraTestBarriers – use barriers between open, write/read, and close |
-d | interTestDelay – delay between reps in seconds |
-e | fsync – perform fsync upon POSIX write close |
-E | useExistingTestFile – do not remove test file before write access |
-k | keepFile – do not remove the test files on program exit |
-o | testFile – full name for test |
-s | segmentCount – number of segments |
