/tmp/bonnie++ -u root:root -x3 -f -d <directory> -s <(RAM in GB) * 3>g

Sequential Output Sequential Input Random
Seeks
Sequential Create Random Create
Machine Name Chunk Size Per Char Block Rewrite Per Char Block Files Create Read Delete Create Read Delete
MegaBytes K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU / sec %CPU /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
ssx single user3G4791911198273465752159.9016439797++++++++++++++++460399++++++++1327193
ssx single user3G4737211197973462632154.5016441298++++++++++++++++450698++++++++14163100
ssx single user3G4793811197563462222163.4016446399++++++++++++++++454998++++++++14324100
ssx single user b3G4767411194343467442156.6016440498++++++++++++++++458799++++++++1351795
ssx single user b3G4781412195243464802164.9016445499++++++++++++++++447897++++++++1404299
ssx single user b3G4779312195013466502161.5016446499++++++++++++++++452098++++++++1433099
ssx multi user3G4794212196263461352154.2016441298++++++++++++++++453498++++++++1424299
ssx multi user3G4723812195773458602153.1016441398++++++++++++++++452298++++++++1424899
ssx multi user3G4699111196533458772144.8016436497++++++++++++++++457699++++++++1332094