Running the Test

Procedure

1. Configure OpenMPI environment variables. For details, see Installing OpenMPI.
2. Use PuTTY to log in to the server where IOR is installed as the root user.
3. Run the following commands to test the aggregated read/write bandwidth performance of the file system:

   cd /home/ior-master/src

   /home/OpenMPI/bin/mpirun --allow-run-as-root -machinefile machiefile -npernode 8 ./ior -b 100g -t 1m -w -r -g -F -e -k -o /mnt/Lustre/ior10

   Table 1 Test Parameters

   Parameter	Description
   -machinefile	Specifies the clients to be tested. Create a machinefile file in /home/IOR/src/C and add the host names of the servers to the file.
   -npernode	Indicates that eight threads are running on each server specified in the machinefile file.
   -b	Specifies that each thread writes 100 GB files.
   -t	Indicates that the transfer size is 1 MB.
   -w	Performs a write test.
   -r	Performs a read test. -w –r: performs a read test after a write test.
   -g	intraTestBarriers -- use barriers between open, write/read, and close
   -F	Indicates the filePerProc mode.
   -e	Synchronizes written data to hard disks.
   -k	Keeps a test file.
   -o	Specifies a test file. In filePerProc mode, IOR automatically generates a number after each file to ensure one thread writes a file. /mnt/Lustre/ior: mounts the /mnt/Lustre directory on a client to the Lustre file system. You can change ior to another name.

   Figure 1 shows the test result example. The write bandwidth performance is 3216.53 MB/s, and the read bandwidth performance is 2613.25 MB/s.

   Figure 1 Test result example