500kemptyfiles.fio

[global]
create_on_open=1
nrfiles=31250
readwrite=write
ioengine=filecreate
fallocate=none
filesize=4k
openfiles=1

[t0]
[t1]
[t2]
[t3]
[t4]
[t5]
[t6]
[t7]
[t8]
[t9]
[t10]
[t11]
[t12]
[t13]
[t14]
[t15]